Interfacial Energetics Reversal Strategy for Efficient Perovskite Solar Cells
Abstract
Abstract Reducing heterointerface nonradiative recombination is a key challenge for realizing highly efficient perovskite solar cells (PSCs). Motivated by this, a facile strategy is developed via interfacial energetics reversal to functionalize perovskite heterointerface. A surfactant molecule, trichloro[3‐(pentafluorophenyl)propyl]silane (TPFS) reverses perovskite surface energetics from intrinsic n‐type to p‐type, evidently demonstrated by ultraviolet and inverse photoelectron spectroscopies. The reconstructed perovskite surface energetics match well with the upper deposited hole transport layer, realizing an exquisite energy level alignment for accelerating hole extraction across the heterointerface. Meanwhile, TPFS further diminishes surface defect density. As a result, this cooperative strategy leads to greatly minimized nonradiative recombination. PSCs achieve an impressive power conversion efficiency of 25.9% with excellent reproducibility, and a nonradiative recombination‐induced qV oc loss of only 57 meV, which is the smallest reported to date in n‐i‐p structured PSCs.
Article Details
Authors (17)
Sheng Jiang
Shanghai Advanced Research Institute
Shaobing Xiong
School of Physics East China Normal University Shanghai China
Zhongcheng Yuan
Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford OX1 3PU, U.K.
Yafang Li
Xiaomeng You
Shanghai Key Laboratory of Magnetic Resonance East China Normal University Shanghai 200241 China
Hongbo Wu
Zhejiang Key Laboratory of Energy Conversion Materials for Advanced Motor College of Materials and Environmental Engineering Hangzhou Dianzi University Hangzhou China
Menghui Jia
State Key Laboratory of Precision Spectroscopy
Zhennan Lin
Key Laboratory of Polar Materials and Devices (MOE), and Department of Electronics
Zaifei Ma
Yuning Wu
School of Physics and Electronic Science East China Normal University Shanghai 200241 China
Yefeng Yao
Shanghai Key Laboratory of Magnetic Resonance East China Normal University Shanghai China
Xianjie Liu
Laboratory of Organic Electronics Department of Science and Technology (ITN) Linköping University Norrköping Sweden
Junhao Chu
State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics
Zhenrong Sun
State Key Laboratory of Precision Spectroscopy, School of Physics
Mats Fahlman
Henry J. Snaith
Qinye Bao
School of Physics East China Normal University Shanghai China