Device simulation of quasi-two-dimensional perovskite/silicon tandem solar cells towards 30%-efficiency  

作　　者：Xiao-Ping Xie Qian-Yu Bai Gang Liu Peng Dong Da-Wei Liu Yu-Feng Ni Chen-Bo Liu He Xi Wei-Dong Zhu Da-Zheng Chen Chun-Fu Zhang 谢小平;白倩玉;刘刚;董鹏;刘大伟;倪玉凤;刘晨波;习鹤;朱卫东;陈大正;张春福(Qinghai Huanghe Hydropower Development CO.,LTD.,Xining 810008,China;State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology,Xidian University,Xi’an 710071,China)

机构地区：[1]Qinghai Huanghe Hydropower Development CO.,LTD.,Xining 810008,China [2]State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology,Xidian University,Xi’an 710071,China

出　　处：《Chinese Physics B》2022年第10期592-598,共7页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant Nos. 62004151, 62274126, 62274126, 61874083, and 61804113);the China Postdoctoral Science Foundation (Grant No. 2020T130490)。

摘　　要：Perovskite/silicon(Si) tandem solar cells have been recognized as the next-generation photovoltaic technology with efficiency over 30% and low cost. However, the intrinsic instability of traditional three-dimensional(3D) hybrid perovskite seriously hinders the lifetimes of tandem devices. In this work, the quasi-two-dimensional(2D)(BA)_(2)(MA)_(n-1)Pbn I_(3n+1)(n = 1, 2, 3, 4, 5)(where MA denotes methylammonium and BA represents butylammonium), with senior stability and wider bandgap, are first used as an absorber of semitransparent top perovskite solar cells(PSCs) to construct a fourterminal(4T) tandem devices with a bottom Si-heterojunction cell. The device model is established by Silvaco Atlas based on experimental parameters. Simulation results show that in the optimized tandem device, the top cell(n = 4) obtains a power conversion efficiency(PCE) of 17.39% and the Si bottom cell shows a PCE of 11.44%, thus an overall PCE of 28.83%. Furthermore, by introducing a 90-nm lithium fluoride(LiF) anti-reflection layer to reduce the surface reflection loss, the current density(J_(sc)) of the top cell is enhanced from 15.56 m A/cm^(2) to 17.09 m A/cm^(2), the corresponding PCE reaches 19.05%, and the tandem PCE increases to 30.58%. Simultaneously, in the cases of n = 3, 4, and 5, all the tandem PCEs exceed the limiting theoretical efficiency of Si cells. Therefore, the 4T quasi-2D perovskite/Si devices provide a more cost-effective tandem strategy and long-term stability solutions.

关 键 词：TWO-DIMENSIONAL device simulation antireflection layers tandem solar cells 

分 类 号：TB34[一般工业技术—材料科学与工程] TM914.4[电气工程—电力电子与电力传动]