Cs2AgBi0.75Sb0.25Br6钙钛矿太阳能电池的优化设计
Optimal design of Cs2AgBi0.75Sb0.25Br6 perovskite solar cells
王月荣 1田汉民 2张登琪 1刘维龙 1马旭蕾1
作者信息
- 1. 河北工业大学电子信息工程学院,天津 300401
- 2. 河北工业大学电子信息工程学院,天津 300401;天津电子材料与器件实验室,天津 300401
- 折叠
摘要
双钙钛矿太阳能电池以其低成本、高性能、环境友好、稳定性强而备受关注.本研究使用Silvaco TCAD分析了Cs2AgBi0.75Sb0.25Br6 太阳能电池的钙钛矿层厚度、能带偏移、金属电极功函数、传输层厚度及掺杂浓度与器件效率的关系,以提升器件性能.基于空穴传输层为Spiro-OMeTAD,电子传输层为ZnO的器件进行初始研究,其显示出 12.66%的光电转换效率.结果表明,当钙钛矿层厚度大于 500 nm时,效率趋于饱和.最佳导带偏移量为 0—+0.5 eV,最佳价带偏移量为-0.1—+0.2 eV.在改变器件的电子传输层为ZnOS,空穴传输层分别为MoO3,Cu2O和CuSCN的情况下,优化其厚度和掺杂浓度,最终空穴传输层为Cu2O的双钙钛矿太阳能电池理论光电转换效率达 22.85%,比目前报道的理论效率值相对提升了 25.6%.此外,当金属电极功函数小于-4.9 eV时易实现最佳效率.本工作为开发高性能无铅钙钛矿太阳能电池提供了理论指导.
Abstract
Double perovskite solar cells have attracted much attention due to their low cost,high performance,environmental friendliness,and strong stability.In this study,the effect of thickness of perovskite layer,band offset,metal electrode work function,the thickness and doping concentration of the transport layer on the efficiency of Cs2AgBi0.75Sb0.25Br6 solar cells are analyzed by using Silvaco TCAD to improve device performance.This preliminary study of device based on Spiro-OMeTAD as hole transport layer(HTL)and ZnO as electron transport layer(ETL)shows that the photovoltaic conversion efficiency(PCE)is 12.66%.The results show that the efficiency gradually saturates when the thickness of the perovskite layer is greater than 500 nm.The optimal conduction band offset(CBO)ranges from 0 eV to +0.5 eV and the optimal valence band offset(VBO)from-0.1 eV to +0.2 eV.After changing the device's ETL into ZnOS and HTLs into MoO3,Cu2O and CuSCN,respectively,and optimizing their thickness values and doping concentrations,the final theoretical photovoltaic conversion efficiency of the double perovskite solar cell with an HTL of Cu2O can reach 22.85%,which is increased by 25.6%compared with the currently reported theoretical efficiency value.Moreover,the optimal efficiency is achieved when the metal electrode work function is less than-4.9 eV.This work will help find suitable materials for the transport layer and provide guidance for developing the high-performance and lead-free perovskite solar cells.
关键词
双钙钛矿太阳能电池/光电转换效率/能带偏移/电极功函数Key words
double perovskite solar cell/photoelectric conversion efficiency/band offset/electrode work function引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据