Research progress of n-type oxides thermoelectric materials

doi:10.3969/j.issn.1000-1565.2018.01.003

Abstract

Abstract: Oxide thermoelectric materials have high thermal and chemical stability in air, which show promising potential in the field of high temperature thermoelectric applications.Compared with p-type oxide thermoelectric materials, the ZT values of n-type oxides are generally low, limiting the development of oxides-based thermoelectric devices.This paper discussed in detail the research progresses of the present representative n-type oxide thermoelectric materials, analyzed the preparation methods, the physical mechanisms, and the effects of electrical and thermal modulation on the thermoelectric performances of these materials.Some new ideas for further improvment of the performances of n-type oxide thermoelectrical materials were proposed.

Key words: n-type thermoelectric oxide materials, thermoelectric performance, harmonization of thermal and electrical properties

CLC Number:

O4-1

WANG Shufang, GAO Linjie. Research progress of n-type oxides thermoelectric materials[J]. Journal of Hebei University (Natural Science Edition), 2018, 38(1): 12-21.

References

[1] ZHANG X, ZHAO L D.Thermoelectric materials: Energy conversion between heat and electricity[J].Journal of Materiomics, 2015,1(2): 92-105.DOI:10.1016/j.jmat.2015.01.001.
[2] BELL L E. Cooling, heating, generating power, and recovering waste heat with thermoelectric systems[J].Science, 2008,321(5895): 1457-1461.DOI: 10.1126/science.1158899.
[3] ZEBARJAD M, ESFARJANI K, DRESSELHAUS M S, et al.Perspectives on thermoelectrics: from fundamentals to device applications[J].Energy & Environmental Science, 2012,5(1):5147-5162.DOI: 10.1039/C1EE02497C.
[4] KOUMOTO K, FUNAHASHI R, GUILMEAU E, et al.Thermoelectric ceramics for energy harvesting [J].Journal of the American Ceramic Society, 2013,96(1): 1-23.DOI: 10.1111/jace.12076.
[5] ZHAO L D, TAN G J, HAO S Q, et al.Ultrahigh power factor and thermoelectric performance in hole-doped single-crystal SnSe[J].Science, 2016,351(6269): 141-144.DOI: 10.1126/science.aad3749.
[6] LIU Y, ZHAO L D, LIU Y, et al.Remarkable enhancement in thermoelectric performance of BiCuSeO by Cu deficiencies[J].Journal of the American Ceramic Society, 2011,133(50):20112-20115.DOI: 10.1021/ja2091195.
[7] ZHAO L D, DRAVID V P, KANATZIDIS M G. The panoscopic approach to high performance thermoelectrics[J].Energy & Environmental Science, 2014,7(1): 251-268.DOI: 10.1039/C3EE43099E.
[8] SOOTSMAN J R, CHUNG D Y, KANATZIDIS M G. New and old concepts in thermoelectric materials [J].Angew Chem Int Ed Engl, 2009,48(46):8616-8639.DOI: 10.1002/anie.200900598.
[9] DRESSELHAUS M S, CHEN G, TANG M Y, et al.New directions for low-dimensional thermoelectric materials[J].Advanced Materials, 2007,19(8):1043-1053.DOI: 10.1002/adma.200600527.
[10] BISWAS K, HE J, BLUM I D, et al.High-performance bulk thermoelectrics with all-scale hierarchical architectures[J].Nature, 2012,489(7416):414-418.DOI:10.1038/nature11439.
[11] LIU H, SHI X, XU F, et al.Copper ion liquid-like thermoelectrics[J].Nature Material, 2012,11(5):422-425.DOI:10.1038/nmat3273.
[12] PEI Y, LALONDE A D, HEINZ N A, et al.Stabilizing the optimal carrier concentration for high thermoelectric efficiency[J].Advanced Materials,2011,23(47):5674-5678.DOI: 10.1002/adma.201103153.
[13] ZHAO L D, LO S H, ZHANG Y, et al.Ultralow thermal conductivity and high thermoelectric figure of merit in SnSe crystals[J].Nature, 2014,508(7496): 373-377.DOI:10.1038/nature13184.
[14] ZHAO J B, LIU Z X, REID J, et al.Thermoelectric and electrical transport properties of Mg₂Si multi-doped with Sb, Al and Zn[J].Journal of Materials Chemistry A, 2015,3(39):19774-19782.DOI:10.1039/C5TA03751D.
[15] YU B, ZEBARJADI M, WANG H, et al.Enhancement of thermoelectric properties by modulation-doping in silicon germanium alloy nanocomposites[J].Nano Letters, 2012,12(4):2077-2082.DOI: 10.1021/nl3003045.
[16] FAN H T, SU T C, LI H T, et al.Enhanced thermoelectric performance of PbSe co-doped with Ag and Sb[J].Journal of Alloys and Compounds, 2015,639:106-110.DOI:10.1016/j.jallcom.2015,03.117.
[17] DOLLFUS P, NGUYEN V N, SAINT-MARTIN J. Thermoelectric effects in graphene nanostructures[J].Journal of physics-condensed matter, 2015,27(13):133204.DOI:10.1088/0953-8984/27/13/133204.
[18] WU X L, GAO L J, ROUSSEL P, et al.Growth of c-Axis-Oriented BiCuSeO thin films directly on Si wafers[J].Journal of the American Ceramic Society, 2016,99(10):3367-3370.DOI: 10.1111/jace.14359.
[19] MUN H, CHOI S M, LEE K H, et al.Boundary engineering for the thermoelectric performance of bulk alloys based on bismuth telluride[J].ChemSusChem, 2015,8(14): 2312-2326.DOI: 10.1002/cssc.201403485.
[20] FU C G, WU H J, LIU Y T, et al.Enhancing the figure of merit of heavy-band thermoelectric materials through hierarchical phonon scattering[J].Advanced Science(Weinh), 2016,3(8):1600035.DOI: 10.1002/advs.201600035.
[21] YU H J, JEONG M, LIM Y S, et al.Effects of Cu addition on band gap energy, density of state effective mass and charge transport properties in Bi₂Te₃ composites[J].RSC Advances, 2014,4(82):43811-43814.DOI: 10.1039/C4RA07134D.
[22] HEREMANS J P, JOVOVIC V, TOBERER E S, et al.Enhancement of thermoelectric efficiency in PbTe by distortion of the electronic density of states[J].Science, 2008,321(5888):554-557.DOI: 10.1126/science.1159725.
[23] PEI Y Z, WANG H, GIBBS Z M, et al.Thermopower enhancement in Pb_1-xMn_xTe alloys and its effect on thermoelectric efficiency[J].NPG Asia Materials, 2012,4(9):28.DOI:10.1038/am.2012.52.
[24] WU D, ZHAO L D, TONG X, et al.Superior thermoelectric performance in PbTe-PbS pseudo-binary: extremely low thermal conductivity and modulated carrier concentration[J].Energy & Environmental Science, 2015,8(7): 2056-2068.DOI: 10.1039/C5EE01147G.
[25] LI Y L, QIU P F, QUAN H Z, et al.Enhanced thermoelectric performance in rare-earth filled-skutterudites[J].Journal of Materials Chemistry C, 2016,4(20): 4374-4379.DOI: 10.1039/C6TC01000H.
[26] ZONG P A, HANUS R, DYLLA M, et al.Skutterudite with graphene-modified grain-boundary complexion enhances zT enabling high-efficiency thermoelectric device[J].Energy & Environmental Science, 2017,10(1):183-191.DOI: 10.1039/C6EE02467J.
[27] RAUSCH E, BALKE B, DESCHAUER T, et al.Charge carrier concentration optimization of thermoelectric p-type half-Heusler compounds[J].APL Materials, 2015,3(4):041516.DOI:10.1063/1.4916526.
[28] FU C G, ZHU T J, LIU Y T, et al.Band engineering of high performance p-type FeNbSb based half-Heusler thermoelectric materials for figure of merit zT > 1[J].Energy & Environmental Science, 2015,8(1):216-220.DOI: 10.1039/C4EE03042G.
[29] TERASAKI T, SASAGO Y, UCHINOKURA K. Large thermoelectric power in NaCo₂O₄ single crystals[J].Physical Review B, 1997,56:R12685-R12687.DOI:10.1103/PhysRevB.56.R12685.
[30] ZHAO X H, WANG H F, WANG S F, et al.Enhancement of thermoelectric power factor in NaxCoO₂/Au multilayers[J].RSC Advances, 2014,4(100):57148-57152.DOI: 10.1039/C4RA07319C.
[31] MAENSIRI S, NUANSING W. Thermoelectric oxide NaCo₂O₄ nanofibers fabricated by electrospinning[J].Materials Chemistry and Physics, 2006,99(1):104-108.DOI:10.1016/j.matchemphys.2005.10.004.
[32] VAN NONG N, PRYDS N, LINDEROTH S, et al.Enhancement of the thermoelectric performance of p-type layered oxide Ca₃Co₄O_9+δ through heavy doping and metallic nanoinclusions[J].Advanced Materials, 2011,23(21):2484-2490.DOI: 10.1002/adma.201004782.
[33] ABDELLAHI M, BAHMANPOUR M, BAHMANPOUR M. Modeling Seebeck coefficient of Ca_3-xM_xCo₄O₉(M=Sr, Pr, Ga, Ca, Ba, La, Ag)thermoelectric ceramics[J].Ceramics International, 2015,41(1):345-352.DOI:10.1016/j.ceramint.2014.08.077.
[34] BOYLE C, CARVILLO P, CHEN Y, et al.Grain boundary segregation and thermoelectric performance enhancement of bismuth doped calcium cobaltite[J].Journal of the European Ceramic Society, 2016,36(3):601-607.DOI:10.1016/j.jeurceramsoc.2015.10.042.
[35] WANG S F, SUN L Q, ZHANG H R, et al.Epitaxial Bi₂Sr₂Co₂O_y thin films as a promising p-type transparent conducting oxides[J].Optical Materials Express, 2014,4(10): 2209.DOI:10.1364/OME.4.002209.
[36] WEI R H, TANG X W, HUI Z Z, et al.Sodium doping effects on layered cobaltate Bi₂Sr₂Co₂O_y thin films[J].Journal of the American Ceramic Society, 2014,97(6):1841-1845.DOI: 10.1111/jace.12844.
[37] LIU Y, ZHAO L-D, LIU Y C, et al.Remarkable enhancement in thermoelectric performance of BiCuSeO by Cu deficiencies[J].Journal of the American Chenmical Society, 2011,133: 20112-20115.DOI: 10.1021/ja2091195.
[38] ZHAO L D, HE J Q, BERARDAN D, et al.BiCuSeO oxyselenides: new promising thermoelectric materials[J].Energy & Environmental Science, 2014,7: 2900-2924.DOI: 10.1039/C4EE00997E.
[39] HE J Q, YU H L, PEI Y Z, et al.Resonant doping in BiCuSeO thermoelectrics from first principles[J].Journal of Materials Chemistry A, 2017,5(3): 931-936.DOI: 10.1039/C6TA08788D.
[40] WEN Q, CHANG C, PAN L, et al.Enhanced thermoelectric performance of BiCuSeO by increasing Seebeck coefficient through magnetic ion incorporation [J].Journal of Materials Chemistry A, 2017,5(26):13392-13399.DOI: 10.1039/C7TA03659K.
[41] REN G K, WANG S Y, ZHU Y C, et al.Enhancing thermoelectric performance in hierarchically structured BiCuSeO by increasing bond covalency and weakening carrier-phonon coupling[J].Energy & Environmental Science, 2017,10(7):1590-1599.DOI: 10.1039/C7EE00464H.
[42] LI Z, XIAO C, FAN S J, et al.Dual vacancies: An effective strategy realizing synergistic optimization of thermoelectric property in BiCuSeO[J].Journal of the American Chemical Society, 2015,137(20): 6587-6593.DOI: 10.1021/jacs.5b01863.
[43] WIFF J P, KINEMUCHI Y, KAGA H, et al.Correlations between thermoelectric properties and effective mass caused by lattice distortion in Al-doped ZnO ceramics[J].Journal of the European Ceramic Society, 2009,29(8):1413-1418.https://doi.org/10.1016/j.jeurceramsoc.2008.09.014.
[44] TSUBOTA T, OHTAKI M, EGUCHI K, et al.Transport properties and thermoelectric performance of(Zn_1-yMg_y)_1-xAl_xO[J].Iournal of Materials Chemistry 1998, 8(2): 409-412.DOI: 10.1039/A706213C.
[45] YADAV G G, ZHANG G, QIU B, et al.Self-templated synthesis and thermal conductivity investigation for ultrathin perovskite oxide nanowires[J].Nanoscale, 2011,3(10):4078-4081.DOI: 10.1039/C1NR10624D.
[46] OHTA H, MIZUNO T, ZHENG S, et al.Unusually large enhancement of thermopower in an electric field induced two-dimensional electron gas[J].Advanced Materials, 2012,24(6):740-744.DOI: 10.1002/adma.201103809.
[47] LIU Y, WU W, LIU D B, et al.Enhanced thermoelectric properties of Ga-doped In₂O₃ ceramics via synergistic band gap engineering and phonon suppression[J].Phys Chem Chem Phys, 2015,17(17):11229-11233.DOI: 10.1039/C5CP00739A.
[48] GREGORY O J, AMANI M, FRALICK G C. Thermoelectric power factor of In₂O₃:Pd nanocomposite films[J].Applied Physics Letters, 2011,99(1):013107.DOI:10.1063/1.3607289.
[49] LAN J L, LIN Y H, LIU Y,et al.High Thermoelectric performance of nanostructured In₂O₃-Based ceramics[J].Journal of the American Ceramic Society, 2012,95(8):2465-2469.DOI: 10.1111/j.1551-2916.2012.05284.x.
[50] KOUMOTO K, TERASAKI I, FUNAHASHI R. Complex oxide materials for potential thermoelectric applications[J].Mrs Bulletin, 2006,31: 206-210.DOI:10.1557/mrs2006.46.
[51] MATSUBARA I, FUNAHASHI R, TAKEUCHI T, et al.Fabrication of an all-oxide thermoelectric power generator[J].Applied Physics Letters, 2001,78(23):3627-3629.DOI:10.1063/1.1376155.
[52] OHTAKI M,TSUBOTA T, EGUCHI K, et al.High-temperature thermoelectric properties of(Zn_1-xAlx)O[J].Journal of Applied Physics, 1996,79(3):1816-1818.DOI:10.1063/1.360976.
[53] JUNG K-H, HYOUNG LEE K, SEO W-S, et al.An enhancement of a thermoelectric power factor in a Ga-doped ZnO system: A chemical compression by enlarged Ga solubility[J].Applied Physics Letters, 2012,100(25):253902.DOI:10.1063/1.4729560.
[54] CHAKRAPANI W, PENDYALA C, KASH K, et al.Electrochemical pinning of the Fermi level: mediation of photoluminescence from gallium nitride and zinc oxide[J].Journal of the American Chemical Society, 2008,130(39):12944-12952.DOI:10.1021/ja710999r.
[55] ZHANG L H, TOSHO T, OKINAKA N, et al.Thermoelectric properties of solution combustion synthesized Al-doped ZnO [J].Materials Transactions, 2008,49(12)2868-2874.DOI:10.2320/matertrans.MAW200801.
[56] CAI K F, MULLER E, DRASAR C, et al.Preparation and thermoelectric properties of Al-doped ZnO ceramics[J].Materials Science and Engineering: B, 2003,104(1-2):45-48.DOI:10.1016/S0921-5107(03)00280-0.
[57] WANG N N, XIN H X, LI D, et al.High temperature thermoelectric properties of Nb-doped ZnO ceramics[J].Journal of Physics and Chemistry of Solids, 2013,74(12):1811-1815.DOI:10.1016/j.jpcs.2013.07.012.
[58] YANG Y, PRADEL K C, JING Q S, et al.Thermoelectric Nanogenerators Based on single Sb-doped ZnO micro-nanobelts[J].ACS nano, 2012, 6(8):6984-6989.DOI: 10.1021/nn302481p.
[59] JOOD P D, MEHTA R J, ZHANG Y L, et al.Heavy element doping for enhancing thermoelectric properties of nanostructured zinc oxide[J].RSC Advances, 2014,4(13):6363.10.DOI: 1039/C3RA46813E.
[60] BARASHEED A Z, KUMAR S R S, ALSHAREEF H N. Temperature dependent thermoelectric properties of chemically derived gallium zinc oxide thin films[J].Journal of Materials Chemistry C, 2013,1(26): 4122.DOI: 10.1039/C3TC30215F.
[61] GUILMEAU E, DIAZ-CHAO P, LEBEDEV O I, et al.Inversion Boundaries and Phonon Scattering in Ga:ZnO Thermoelectric Compounds[J].Inorganic Chemistry, 2017,56(1): 480-487.DOI: 10.1021/acs.inorgchem.6b02354.
[62] TRAN NGUYEN N H, NGUYEN T H, LIU Y R, et al.Thermoelectric Properties of indium and gallium dually doped ZnO thin films[J].ACS Applied Materials & Interfaces, 2016,8(49):33916-33923.DOI: 10.1021/acsami.6b10591.
[63] OHTAKI M, ARAKI K, YAMAMOTO K. High thermoelectric performance of dually doped ZnO ceramics[J].Journal of Electronic Materials, 2009,38(7): 1234-1238.DOI: 10.1007/s11664-009-0816-1.
[64] BROCKWAY L, VASIRAJU V, SUNKARA M K, et al.Engineering efficient thermoelectrics from large-scale assemblies of doped ZnO nanowires: nanoscale effects and resonant-level scattering[J].ACS Applied Materials & Interfaces, 2014,6(17):14923-31490.DOI: 10.1021/am5023489.
[65] NAM W H, LIM Y S, CHOI S-M, et al.High-temperature charge transport and thermoelectric properties of a degenerately Al-doped ZnO nanocomposite[J].Journal of Materials Chemistry, 2012,22(29):14633.DOI: 10.1039/C2JM31763J.
[66] JOOD P, MEHTA R J, ZHANG Y, et al.Al-doped zinc oxide nanocomposites with enhanced thermoelectric properties[J].Nano Letter, 2011,11(10):4337-4342.DOI: 10.1021/nl202439h.
[67] ZHANG D-B, LI H-Z, ZHANG B-P, et al.Hybrid-structured ZnO thermoelectric materials with high carrier mobility and reduced thermal conductivity[J].RSC Advances, 2017,7(18):10855-10864.DOI: 10.1039/C6RA28854E.
[68] HE Y, LU P, SHI X, et al.Ultrahigh thermoelectric performance in mosaic crystals[J].Advanced Materials, 2015,27(24): 3639-3644.DOI: 10.1002/adma.201501030.
[69] TAKEMOTO H, FUGANE K, YAN P F, et al.Reduction of thermal conductivity in dually doped ZnO by design of three-dimensional stacking faults[J].RSC Advances, 2014,4(6):2661-2672.DOI: 10.1039/C3RA44223C.
[70] LIANG X. Thermoelectric transport properties of naturally nanostructured Ga-ZnO ceramics: Effect of point defect and interfaces[J].Journal of the European Ceramic Society, 2016,36(7):1643-1650.DOI:10.1016/j.jeurceramsoc.2016.02.017.
[71] TYNELL T, GIRI A, GASKINS J, et al.Efficiently suppressed thermal conductivity in ZnO thin films via periodic introduction of organic layers[J].Journal of Materials Chemistry A, 2014,2(31):12150-12152.DOI: 10.1039/C4TA02381A.
[72] NAM W H, KIM B B, SEO S G, et al.Structurally nanocrystalline-electrically single crystalline ZnO-reduced graphene oxide composites[J].Nano Letter, 2014,14(9):5104-5109.DOI: 10.1021/nl5018089.
[73] CHEN D, ZHAO Y, CHEN Y, et al.One-step chemical synthesis of ZnO/graphene oxide molecular hybrids for high-temperature thermoelectric applications[J].ACS Applied Materials & Interfaces, 2015,7(5):3224-3230.DOI: 10.1021/am507882f.
[74] KINEMUCHI Y, GUILMEAU E, LEBEDEV O I, et al.Tuning of dimensionless figure of merit via boundary scattering in In₂O_3-δ[J].Journal of Applied Physics, 2011,110(12):124304.DOI:10.1063/1.3669392.
[75] BERARADAN D, GUILMEAU E, MAIGNAN A, et al.In₂O₃:Ge, a promising n-type thermoelectric oxide composite [J].Solid State Communications, 2008,146(1-2):97-101.DOI:10.1016/j.ssc.2007.12.033.
[76] COMBE E, CHUBILLEAU C, BERARDAN D, et al.Citrate gel process and thermoelectric properties of Ge-doped In₂O₃ bulk ceramics[J].Powder Technology, 2011,208(2):503-508.DOI:10.1016/j.powtec.2010.08.050.
[77] COMBE E, GUILMEAU E, BERARDAN D, et al.Microwave sintering of Ge-doped In₂O₃ thermoelectric ceramics prepared by slip casting process[J].Journal of the European Ceramic Society, 2015,35(1): 145-151.DOI:10.1016/j.jeurceramsoc.2014.08.012.
[78] LIU Y, LIN Y-H, LAN J-L, et al.Effect of transition-metal cobalt doping on the thermoelectric performance of In₂O₃ ceramics[J].Journal of the American Ceramic Society, 2010,93(10):2938-2941.DOI: 10.1111/j.1551-2916.2010.03904.x.
[79] LIU Y, LIN Y-H, XU Y, et al.High-temperature transport property of In_2-xCe_xO₃(0≤x≤0.10)fine grained ceramics[J].Journal of the American Ceramic Society, 2012,95(8):2568-2572.DOI: 10.1111/j.1551-2916.2012.05206.x.
[80] BERARDAN D, GUILMEAU E, MAIGNAN A, et al.Enhancement of the thermoelectric performances of In₂O₃ by the coupled substitution of M²⁺/Sn⁴⁺ for In³⁺[J].Journal of Applied Physics, 2008,104(6):064918.DOI:10.1063/1.2986148.
[81] CHENG B, FANG H, LAN J L, et al.Thermoelectric performance of Zn and GeCo-Doped In₂O₃ fine-grained ceramics by the spark plasma sintering[J].Journal of the American Ceramic Society, 2011,94(8): 2279-2281.DOI: 10.1111/j.1551-2916.2011.04640.x.
[82] LAN J L, LIN Y, LIN Y-H, et al.Enhanced thermoelectric performance of In₂O₃-based ceramics via Nanostructuring and Point Defect Engineering[J].Scientific Reports, 2015,5: 7783.DOI: 10.1038/srep07783.
[83] SHARMA P A, BROWN-SHAKLEE H J, IHLEFELD J F. Oxygen partial pressure dependence of thermoelectric power factor in polycrystalline n-type SrTiO₃: Consequences for long term stability in thermoelectric oxides[J].Applied Physics Letters, 2017,110(17):173901.DOI:10.1063/1.4982239.
[84] SUN J, SINGH D J. Thermoelectric properties ofn-type SrTiO₃[J].APL Materials, 2016,4(10):104803.DOI:10.1063/1.4952610.
[85] AKIN I, LI M, LU Z L, et al.Oxygen-loss in A-site deficient Sr_0.85La_0.10TiO₃ perovskite[J].RSC Advances, 2014,4(61):32549-32554.DOI: 10.1039/C4RA04199B.
[86] DANG F, WAN C, PARK N H, et al.Thermoelectric performance of SrTiO₃ enhanced by nanostructuring-self-assembled particulate film of nanocubes[J].ACS Applied Materials & Interfaces, 2013,5(21):10933-10937.DOI: 10.1021/am403112n.
[87] PARK K, SON J S, WOO S I, et al.Colloidal synthesis and thermoelectric properties of La-doped SrTiO₃ nanoparticles[J].Journal of Materials Chemistry A, 2014,2(12):4217.DOI: 10.1039/C3TA14699E.
[88] KOVALEVSKY A V, YAREMCHENKO A A, POPULON S, et al.Towards a high thermoelectric performance in rare-earth substituted SrTiO₃: effects provided by strongly-reducing sintering conditions[J].Phys Chem Chem Phys, 2014,16(48):26946-26954.DOI: 10.1039/C4CP04127E.
[89] ROY P, PAL V, MAITI T.Effect of Spark Plasma Sintering(SPS)on the thermoelectric properties of SrTiO₃:15 at% Nb[J].Ceramics International, 2017,43(15):12809-12813.DOI:10.1016/j.ceramint.2017.06.170.
[90] MEHDIZADEH DEHKORDI A, BHATTACHARYA S, DARROUDI T, et al.Large Thermoelectric Power Factor in Pr-Doped SrTiO_3-δCeramics via Grain-Boundary-Induced Mobility Enhancement[J].Chemistry of Materials, 2014,26(7):2478-2485.DOI: 10.1021/cm4040853.
[91] DEHKORDI A M, BHATTACHARYA S, DARROUDI T, et al.New insights on the synthesis and electronic transport in bulk polycrystalline Pr-doped SrTiO_3-δ[J].Journal of Applied Physics, 2015,117(5):055102.DOI:10.1063/1.4905417.
[92] WANG N, CHEN H, HE H, et al.Enhanced thermoelectric performance of Nb-doped SrTiO₃ by nano-inclusion with low thermal conductivity[J].Scientific Reports, 2013,3:3449.DOI: 10.1038/srep03449.
[93] WANG H C, WANG C L, SU W B, et al.Doping effect of La and Dy on the thermoelectric properties of SrTiO₃[J].Journal of the American Ceramic Society, 2011,94(3):838-842.DOI: 10.1111/j.1551-2916.2010.04185.x.
[94] KOVALEVSKY A V, POPULON S, PATRICIO S G, et al.Design of SrTiO₃-based thermoelectrics by tungsten substitution[J].The Journal of Physical Chemistry C, 2015,119(9):4466-4478.DOI: 10.1021/jp510743h.
[95] ABUTAHA A I, KUMAR S R S, LI K, et al.Enhanced thermoelectric figure-of-merit in thermally robust, nanostructured superlattices based on SrTiO₃[J].Chemistry of Materials, 2015,27(6):2165-2171.DOI: 10.1021/acs.chemmater.5b00144.
[96] KOVALEVSKY A V, YAREMCHENKO A A, POPULON S, et al.Effect of a-site cation deficiency on the thermoelectric performance of donor-substituted strontium titanate[J].The Journal of Physical Chemistry C, 2014,118(9):4596-4606.DOI: 10.1021/jp409872e.
[97] SRIVASTAVA D, NORMAN C, AZOUGH F, et al.Tuning the thermoelectric properties of A-site deficient SrTiO₃ ceramics by vacancies and carrier concentration[J].Phys Chem Chem Phys, 2016,18(38):26475-26486.DOI: 10.1039/C6CP05523K.
[98] LIU Z L, ZHANG H R, LEI W, et al.High-figure-of-merit thermoelectric La-doped a-site-deficient SrTiO₃ Ceramics[J].Chemistry of Materials, 2016,28(3):925-935.DOI: 10.1021/acs.chemmater.5b04616.
[99] MOLINARI M, TOMPSETT D A, PAR KER S C, et al.Structural, electronic and thermoelectric behaviour of CaMnO₃ and CaMnO_3-δ[J].Journal of Materials Chemistry A, 2014,2(34):14109-14117.DOI: 10.1039/C4TA01514B.
[100] SCHRADE M, KABIR R, LI S, et al.High temperature transport properties of thermoelectric CaMnO_3-δ-Indication of strongly interacting small polarons[J]. Journal of Applied Physics, 2014,115: 103705.DOI:10.1063/1.4868321.
[101] WANG Y, SUI Y, CHENG J G, et al.High temperature metal-insulator transition induced by rare-earth doping in perovskite CaMnO₃[J].The Journal of Physical Chemistry C, 2009,113:12509-12516.DOI: 10.1021/jp809049s.
[102] VECHERSKII S I, KONOPELOK M A, ESINA N O, et al.Transport Properties of Ca_1-xMnO_3-δ+xCeO₂(0 <x≤0.15)Mixtures[J].Inorganic Materials, 2002,38(12): 1270-1276..
[103] XU G J, FUNAHASHI R, MATSUBARA I, et al.High-temperature thermoelectric properties of the Ca_1-xBi_xMnO₃ system[J].Journal of Materials Research, 2002,17(5):1092-1095.DOI:10.1557/JMR.2002.0161.
[104] OHTAKI M, KOGA H, TOKUNAGA T, et al.Electrical transport properties and high-temperature thermoelectric performance of(Ca_0.9M_0.1)MnO₃(M=Y, La, Ce, Sm, In, Sn, Sb, Pb, Bi)[J].Journal of Solid State Chemistry, 1995,120:105-111.DOI:10.1006/jssc.1995.1384.
[105] BHASKAR A, YUAN J J, LIU C J. Thermoelectric properties of n-type Ca_1-xBi_xMnO_3-δ(0.00, 0.02, and 0.05)system[J].Journal of Electroceramics, 2013,31(1-2): 124-128.DOI 10.1007/s10832-013-9811-2.
[106] KABIR R, TIAN R M, ZHANG T S, et al.Role of Bi doping in thermoelectric properties of CaMnO₃[J].Journal of Alloys and Compounds, 2015,628:347-351.DOI:10.1016/j.jallcom.2014.12.141.
[107] WANG Y, SUI Y, WANG X J, et al.Effects of substituting La³⁺,Y³⁺ and Ce⁴⁺ for Ca²⁺ on the high temperature transport and thermoelectric properties of CaMnO₃[J].Journal of Physics D: Applied Physics, 2009,42: 055010.
[108] WANG Y, SUI Y, SU W.High temperature thermoelectric characteristics of Ca_0.9R_0.1MnO₃(R=La,Pr,…,Yb)[J].Journal of Applied Physics, 2008,104(9):093703.DOI:10.1063/1.3003065.
[109] FLAHAUT D, MIHARA T, FUNAHASHI R, et al.Thermoelectrical properties of A-site substituted Ca_1-xRe_xMnO₃ system[J].Journal of Applied Physics, 2006,100(8): 084911.DOI:10.1063/1.2362922.
[110] ZHU Y H, SU W B, LIU J, et al.Effects of Dy and Yb co-doping on thermoelectric properties of CaMnO₃ ceramics[J].Ceramics International, 2015,41(1):1535-1539.DOI:10.1016/j.ceramint.2014.09.089.
[111] ZHOU Y Q, MATSUBARA I, FUNAHASHI R, et al.Influence of Mn-site doped with Ru on the high-temperature thermoelectric performance of CaMnO_3-δ [J].Materials Research Bulletin, 2003,38:341-346.DOI:10.1016/S0025-5408(02)00997-2.
[112] THIEL P, EILERTSEN J, POPULOH S, et al.Influence of tungsten substitution and oxygen deficiency on the thermoelectric properties of CaMnO_3-δ [J].Journal of Applied Physics, 2013,114:243707.DOI:10.1063/1.4854475.
[113] TAGUCHI H, KUGI T, KATO M, et al.Fabrication of(Ca_1-xLa_x)MnO₃ Ceramics with a High Relative Density and their Power Factor[J].Journal of the American Ceramic Society, 2010,93(10): 3009-3011.DOI: 10.1111/j.1551-2916.2010.03987.x.
[114] LAN J L, LIN Y H, FANG H, et al.High-Temperature Thermoelectric Behaviors of Fine-Grained Gd-Doped CaMnO₃ Ceramics[J].Journal of the American Ceramic Society, 2010,93(8):2121-2124.DOI: 10.1111/j.1551-2916.2010.03673.x.
[115] BOCHER L, AGUIRRE M H, LOGINOVICH, et al.CaMn_1-xNb_xO₃(x≤0.08)perovskite-type phases as promising new high-temperature n-type thermoelectric materials[J].Inorganic Chemistry,2008,47(18):8077-8085.DOI: 10.1021/ic800463s.
[116] GAO L J, LI L J, WANG S F, et al.Enhanced thermoelectric performance of CdO ceramics by PMMA and Cu₂O Co-Doping[J].Science of Advanced Materials, 2015,7(11):2470-2475.DOI:10.1166/sam.2015.2428.
[117] WANG S F, LIU F Q,LV Q, et al.The effect of Er³⁺ doping on the structure and thermoelectric properties of CdO ceramics[J].Journal of the European Ceramic Society, 2013,33(10): 1763-1768.DOI:10.1016/j.jeurceramsoc.2013.02.025.
[118] WANG S F, LV Q, LI L J, et al.High-temperature thermoelectric properties of Cd_1-xPr_xO ceramics[J].Scripta Materialia, 2013,69(7): 533-536.DOI:10.1016/j.scriptamat.2013.06.018.
[119] GAO L J, WANG L J, LI L J, et al.Tuning of the microstructure and thermoelectric properties of CdO ceramics by Mg substituting[J].Materials Chemistry and Physics, 2016,174: 172-178.DOI:10.1016/j.matchemphys.2016.02.069.
[120] GAO L J, ZHAI S J, LIU R, et al.Enhanced Thermoelectric Performance of CdO Ceramics Via Ba²⁺Doping[J].Journal of the American Ceramic Society, 2015,98(10):3285-3290.DOI: 10.1111/jace.13780.
[121] GAO L J, WANG S F, LIU R, et al.Enhanced thermoelectric performance in Mg and Ca substituted CdO ceramics[J].RSC Advances, 2016,6(48):42249-42254.DOI: 10.1039/C6RA04175B.
[122] LI L, LIANG S, LI S, et al.Enhanced thermoelectric performance in CdO by nano-SiO₂ inclusions[J].Nanotechnology, 2014,25(42):425402.DOI: 10.1088/0957-4484/25/42/425402.
[123] LIU R, GAO L J, LI L J, et al.Enhanced high-temperature thermoelectric performance of CdO ceramics with randomly distributed micropores[J].Journal of the American Ceramic Society, 2017,100(7): 3239-3245.DOI: 10.1111/jace.14849.
[124] GAO L J, WANG S F, LIU R, et al.The effect of Ni doping on the thermoelectric transport properties of CdO ceramics[J].Journal of Alloys and Compounds, 2016,662:213-219.DOI:10.1016/j.jallcom.2015.12.043.
[125] GAO L J, WANG F S, LIU R, et al.Enhanced thermoelectric performance of CdO:Ag nanocomposites[J].Dalton Transactions, 2016,45(30):12215-12220.DOI: 10.1039/C6DT02348G.
[126] FU G S, GAO L J, LIU R, et al.Synergistically tuning the electrical and thermal transport properties of CdO:Cu thermoelectric ceramics[J].Materials Research Express, 2017,4(7):075502.DOI: 10.1088/2053-1591/aa70d8.