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.
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)。
作者简介
Corresponding author:Wangchao Chen,E-mail addresses:Chenwc@hfut.edu.cn;Corresponding author:Zhiqian Yang,E-mail addresses:zqli@rnek.cas.cn;Corresponding author:Hong Zhang,E-mail addresses:zhanghong81@hebeu.edu.cn;Corresponding author:Linhua Hu,E-mail addresses:lhhu@rntek.cas.cn。
