Abstract: Replacing the gold(Au)back electrode commonly used in normal perovskite solar cells(PSCs)with silver(Ag)can effectively reduce the manufacturing cost of the device and facilitate the commercial application of PSCs. However, the Schottky barrier caused by the mismatch of work function at the interface between the hole transport layer and the silver electrode can lead to S-shaped J-V curves of PSCs, significantly reducing the photovoltaic performance of the device. Here, we introduce a molybdenum oxide(MoOx)buffer layer deposited by thermal evaporation between the hole transport layer and the silver electrode. It is demonstrated that inserting a MoOx buffer layer with appropriate thickness between- DOI:10.3969/j.issn.1000-1565.2025.06.006MoOx缓冲层增强银基钙钛矿太阳电池效率及稳定性武利平¹,蒋树刚²,张文修¹,谢英²,王新占¹,李科¹,何雷²,路万兵¹(1.河北大学 物理科学与技术学院, 新能源光电器件国家地方联合工程实验室,河北 保定 071002;2.保定学院 汽车与电子工程学院,河北 保定 071000)摘 要:用银(Ag)替代正置钙钛矿太阳电池(perovskite solar cells,PSCs)中常用的金(Au)背电极,可以有效降低器件的制备成本,便于PSCs的商业应用.然而,空穴传输层与银电极界面功函数不匹配引起的肖特基势垒,会导致PSCs出现异常的S形电流密度-电压(current density-voltage, J-V)曲线,显著降低器件光伏性能.本文通过在PSCs的空穴传输层与银背电极之间,利用热蒸发法沉积合适厚度的MoOx缓冲层,有效改善了界面的空穴输运特性,消除了银作为背电极的PSCs的J-V曲线的S形特征.同时,该MoOx缓冲层还有利于抑制银电极与钙钛矿层中的碘离子之间的扩散反应,提高器件的稳定性.通过分析MoOx缓冲层厚度对PSCs光伏性能的影响发现:随着MoOx层厚度的增加,PSCs的光电转换效率(photoelectric conversion efficiency,PCE)先增加后减少.当MoOx层厚度为9 nm时,所制备的PSCs光伏性能最优,其PCE达到18.7%,较无MoOx缓冲层的参考器件提高了41%.关键词:钙钛矿太阳电池;电极;稳定性中图分类号:TM914.4 文献标志码:A 文章编号:1000-1565(2025)06-0609-06Efficiency and stability of silver-based perovskite solar cells enhanced by MoOx buffer layerWU Liping¹, JIANG Shugang², ZHANG Wenxiu¹, XIE Ying², WANG Xinzhan¹, LI Ke¹, HE Lei², LU Wanbing¹(1. National & Local Joint Engineering Laboratory of New Energy Photoelectric Devices, College of Physics Science and Technology, Hebei University, Baoding 071002, China; 2. College of Automotive and Electronic Engineering, Baoding University, Baoding 071000, China)Abstract: Replacing the gold(Au)back electrode commonly used in normal perovskite solar cells(PSCs)with silver(Ag)can effectively reduce the manufacturing cost of the device and facilitate the commercial application of PSCs. However, the Schottky barrier caused by the mismatch of work function at the interface between the hole transport layer and the silver electrode can lead to S-shaped J-V curves of PSCs, significantly reducing the photovoltaic performance of the device. Here, we introduce a molybdenum oxide(MoOx)buffer layer deposited by thermal evaporation between the hole transport layer and the silver electrode. It is demonstrated that inserting a MoOx buffer layer with appropriate thickness between- 收稿日期:2024-12-19;修回日期:2025-05-16 基金项目:河北省自然科学基金项目(E2021201014);保定市“揭榜挂帅”项目(2023创206) 第一作者:武利平(1980—),女,河北大学副教授,主要从事光电功能材料及新能源器件方向研究.E-mail:lipingwu@hbu.edu.cn 通信作者:何雷(1971—),男,保定学院副教授,主要从事原子物理及光电功能材料方向研究.E-mail:helei@bdu.edu.cn路万兵(1980—),男,河北大学副教授,博士,主要从事光电功能材料及新能源器件方向研究.E-mail:wanbinglu@hbu.edu.cn 第6期武利平等:MoOx缓冲层增强银基钙钛矿太阳电池效率及稳定性河北大学学报(自然科学版) 第45卷the hole transport layer and the silver electrode can effectively improve the hole transport characteristics of the interface and eliminate the S-shaped J-V curve of PSCs with silver as the back electrode. Meanwhile, the MoOx buffer layer also can improve the stability of devices by suppressing the diffusion reaction between the Ag electrode and iodide ions in the perovskite layer. By analyzing the effect of MoOx buffer layer thickness on the photovoltaic performance of PSCs, it was found that as the MoOx layer thickness increases, the photoelectric conversion efficiency(PCE)of PSCs first increases and then decreases. When the thickness of the MoOx layer is 9 nm, the photovoltaic performance of the prepared PSCs is optimal, with a PCE of 18.7%, which is 41% higher than the reference device without a MoOx buffer layer.

Key words: perovskite solar cells, electrodes, stability