电子传输层锂盐掺杂对Cs_(2)AgBiBr_(6)双钙钛矿太阳电池性能的影响研究  

STUDY ON EFFECT OF LITHIUM SALT DOPING IN THE ELECTRON TRANSPORT LAYER ON PERFORMANCE OF Cs_(2)AgBiBr_(6)DOUBLE PEROVSKITE SOLAR CELLS

作　　者：杨阿康 张伦 吕梅 朱俊 Yang Akang;Zhang Lun;Lyu Mei;Zhu Jun(Academy of Opto-electric Technology,Anhui Province Key Laboratory of Measuring Theory and Precision Instrument,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学光电技术研究院,安徽省测量理论与精密仪器重点实验室,合肥230009

出　　处：《太阳能》2023年第10期30-37,共8页Solar Energy

基　　金：国家重点研发计划项目(2019YFE0101300);合肥市自然科学基金(2021040)。

摘　　要：电子传输层是影响钙钛矿太阳电池性能的重要因素。常用的介孔二氧化钛(mp-TiO_(2))电子传输层存在较多表面缺陷,电荷提取效率较低,复合几率高。利用双(三氟甲烷磺酰)亚胺锂(LiTFSI)对mp-TiO_(2)进行锂盐掺杂,并将其应用于Cs_(2)AgBiBr_(6)双钙钛矿太阳电池(下文简称为“Cs_(2)AgBiBr_(6)太阳电池”)中,以研究锂盐掺杂对Cs_(2)AgBiBr_(6)薄膜和Cs_(2)AgBiBr_(6)太阳电池性能的影响。研究结果表明:1)锂盐掺杂改善了Cs_(2)AgBiBr_(6)薄膜的结晶度,降低了其缺陷态密度,促进了电子传输层/钙钛矿界面处的电荷转移;2)掺杂的锂盐最优质量浓度为10 mg/mL,在该掺杂浓度下制备的Cs_(2)AgBiBr_(6)太阳电池的短路电流密度从1.92 mA/cm^(2)提升到2.43 mA/cm^(2),填充因子从58.87%增加到68.05%,光电转换效率从1.19%提升到1.66%;3)在空气环境条件下放置66天后,未封装的Cs_(2)AgBiBr_(6)太阳电池的光电转换效率仍可保持初始值的85%。The electron transport layer is an important factor affecting the performance of perovskite solar cells.The commonly used mesoporous TiO_(2)(mp-TiO_(2))electron transport layer has many surface defects,low charge extraction efficiency,and high recombination probability.This paper uses bis(trifluoromethanesulfonyl)imine lithium(LiTFSI)to doped mp-TiO2 with lithium salts,and applies it to Cs_(2)AgBiBr_(6)double perovskite solar cells(hereinafter referred to as"Cs_(2)AgBiBr_(6)solar cells")to study the effect of lithium salt doping on the performance of Cs_(2)AgBiBr_(6)thin films and Cs_(2)AgBiBr_(6)solar cells.The research results show that:1)lithium salt doping improves the crystallinity of Cs_(2)AgBiBr_(6)thin films,reduces their defect density of states,and promotes charge transfer at the electron transport layer/perovskite interface.2)The optimal mass concentration of doped lithium salt is 10 mg/mL,and the short-circuit current density of Cs_(2)AgBiBr solar cells prepared at this doping concentration increased from 1.92 mA/cm^(2)to 2.43 mA/cm^(2),the filling factor increased from 58.87%to 68.05%,and the photoelectric conversion efficiency increased from 1.19%to 1.66%.3)After being placed in an air environment for 66 days,the photoelectric conversion efficiency of the unpackaged Cs_(2)AgBiBr_(6)solar cell can still maintain 85%of the initial value.

关 键 词：非铅钙钛矿 双钙钛矿太阳电池 Cs_(2)AgBiBr_(6) 介孔二氧化钛 电子传输层 锂盐掺杂 光电转换效率 

分 类 号：TM914.42[电气工程—电力电子与电力传动]