Molecular exchange and passivation at interface afford high-performing perovskite solar cells with efficiency over 24%  

作　　者：Jianjun Sun Wangchao Chen Yingke Ren Yunjuan Niu Zhiqian Yang Li'e Mo Yang Huang Zhaoqian Li Hong Zhang Linhua Hu 

机构地区：[1]Key Laboratory of Photovoltaic and Energy Conservation Materials,Institute of Solid State Physics,HFIPS,Chinese Academy of Sciences,Hefei 230031,Anhui,China [2]School of Chemistry and Chemical Engineering,Anhui Province Key Laboratory of Advanced Catalytic Materials and Reaction Engineering,Hefei University of Technology,Hefei 230009,Anhui,China [3]College of Science,Hebei University of Science and Technology,Shijiazhuang 050018,Hebei,China [4]Hebei Computational Optical Imaging and Photoelectric Detection Technology Innovation Center,Hebei International Joint Research Center for Computational Optical Imaging and Intelligent Sensing,School of Mathematics and Physics Science and Engineering,Hebei University of Engineering,Handan 056038,Hebei,China [5]University of Science and Technology of Chin1,Anhui 230026,Hefei,China

出　　处：《Journal of Energy Chemistry》2023年第7期219-227,I0005,共10页能源化学（英文版）

基　　金：supported by the National Key R&D Program of China(2019YFB1503200);the National Natural Science Foundation of China(52002105);the Key Research and Development Plan Project of Anhui Province(2022H11020014);the West Light Foundation of the Chinese Academy of Sciences(XAB2020YW11);the Collaborative Innovation Program of Hefei Science Center,CAS(2022HSC-CIP006);the Fundamental Research Funds for the Central Universities(JZ2021HGTB0105);the Hefei Institutes of Physical Science,Chinese Academy of Sciences Director’s Fund(YZJJ201902,YZJJZX202018);the Natural Science Foundation of Hebei Province(F2021208014);the Science and Technology Project of Hebei Education Department(QN2021063);the Science and Technology Research Project for the Colleges and Universities in Hebei Province(QN2022034)。

摘　　要：The interface is crucial for perovskite solar cells(PSCs).However,voids at interfaces induced by the trapped hygroscopic dimethyl sulfoxide(DMSO)can reduce charge extraction and accelerate the film degradation,seriously damaging the efficiency and stability.In this work,4,4’-dinonyl-2,2’-dipyridine(DN-DP),a Lewis base with long alkyl chains is introduced to solve this problem.Theoretical calculated and experimental results confirm that the dipyridyl group on DN-DP can more strongly coordinate with Pb^(2+)than that of the S=O group on DMSO.The strong coordination effect plays a crucial role in removing the DMSO-based adduct and reducing the formation of voids.Due to the electron-donating properties of pyridine,the existence of DN-DP in the perovskite film can passivate the defects and optimize the energy level alignment of the perovskite configuration.The open-circuit voltage(VOC)of the DN-DP-based PSC is improved from 1.107 V(control device)to 1.153 V,giving rise to a power conversion efficiency(PCE)of24.02%.Furthermore,benefiting from the moisture resistance stemming from the hydrophobic nonyl group,the PCE retains 90.4%of the initial performance after 1000 h of storage in the ambient condition.

关 键 词：Perovskite solar cell ANTI-SOLVENT 4 4′-Dinonyl-2 2′-dipyridine Optimized interfaceStability 

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