Graded 2D/3D(CF_(3)-PEA)_(2)FA_(0.85)MA_(0.15)Pb_(2)I_(7)/FA_(0.85)MA_(0.15)PbI_(3) heterojunction for stable perovskite solar cell with an efficiency over 23.0%  

作　　者：Yuan Cai Jialun Wen Zhike Liu Fang Qian Chenyang Duan Kun He Wenjing Zhao Sheng Zhan Shaomin Yang Jian Cui Shengzhong(Frank)Liu 

机构地区：[1]Key Laboratory of Applied Surface and Colloid Chemistry,Ministry of Education,Shaanxi Key Laboratory for Advanced Energy Devices,Shaanxi Engineering Lab for Advanced Energy Technology,School of Materials Science and Engineering,Shaanxi Normal University,Xi’an 710119,Shaanxi,China [2]iChEM,Dalian Institute of Chemical Physics,University of Chinese Academy of Sciences,Dalian National Laboratory for Clean Energy,Chinese Academy of Sciences,Dalian 116023,Liaoning,China

出　　处：《Journal of Energy Chemistry》2022年第2期480-489,共10页能源化学（英文版）

基　　金：support from the National Natural Science Foundation of China(62074095);the National Key Research and Development Program of China(2016YFA0202403);the Fundamental Research Funds for the Central Universities(GK202002001);the 111 Project B(14041);the DNL Cooperation Fund CAS(DNL180311);support of the H2 cluster in Xi’an Jiaotong University。

摘　　要：The replacement of small cations with bulkier organic cations containing long alkyl chains or benzene rings to form a thin two-dimensional(2D)perovskite passivation layer on three-dimensional(3D)perovskite(2D/3D)has become a promising strategy for improving both the efficiency and stability of perovskite solar cells(PSCs).The 2 D layer defines the interfacial chemistry and physics at the 2D/3D bilayer and endows the 2D/3D structure with better chemical and thermal stability.Herein,2D/3D(CF_(3)-PEA)_(2) FA_(0.85)MA_(0.15)Pb_(2)I_(7)/FA_(0.85)MA_(0.15)PbI_(3) planar heterojunction perovskite was produced using a facile interfacial ion exchange process.The 2 D(CF_(3)-PEA)_(2) FA_(0.85)MA_(0.15)Pb_(2)I_(7) capping layer can not only passivate the FA_(0.85)MA_(0.15)PbI_(3) film but also act as super-hydrophobic layer to inhibit water diffusion and significantly enhance the stability.The 2D capping layer can also establish a unique graded band structure at the perovskite/Spiro-OMeTAD interface and lead to p-type doping for Spiro-OMeTAD layer which is beneficial for efficient charge transport.Optimized PSCs based on this 2D/3D heterojunction yield a champion power conversion efficiency(PCE)of 23.1%and improved stability.The device maintains 84%output for 2400 h aging under ambient environmental conditions without encapsulation,and maintains 81%for 200 h under illumination with encapsulation.This work will inspire the design of more fluorinated 2D perovskite interfaces for advanced photovoltaics and beyond.

关 键 词：Perovskite solar cells HETEROJUNCTION Two-dimensional FA_(0.85)MA_(0.15)PbI_(3) High efficiency 

分 类 号：TM914.4[电气工程—电力电子与电力传动] TB383.2[一般工业技术—材料科学与工程]