Ameliorating the Interfacial Mismatch of SnO2 and Perovskite Enabling High Mechanical Stability for Flexible Perovskite Solar Cells

Author:

Wang Chengyun1,Jiang Yue1ORCID,Li Yihui1,Yang Zhengchi1,Xu Zhengjie2,Chen Cong3,Wang Zhen1,Zhou Guofu4,Liu Jun‐Ming5,Gao Jinwei1

Affiliation:

1. Institute for Advanced Materials & Guangdong Provincial Key Laboratory of Optical Information Materials and Technology South China Academy of Advanced Optoelectronics South China Normal University Guangzhou 510006 China

2. School of Electronic and Computer Engineering Peking University Shenzhen Graduate School Shenzhen 518055 China

3. Department of Advanced Design and Systems Engineering City University of Hong Kong Hong Kong 999077 China

4. Guangdong Provincial Key Laboratory of Optical Information Materials and Technology & Institute of Electronic Paper Displays South China Academy of Advanced Optoelectronics South China Normal University Guangzhou 510006 China

5. Laboratory of Solid‐State Microstructures Nanjing University Nanjing 210093 China

Abstract

SnO2 has been a widely used electron transport layer, due to its high electron mobility and stable chemical properties in n–i–p type perovskite solar cells (PSCs). However, the interfacial mismatch, especially on the residual strain and the different mechanical properties between SnO2 and perovskite films, leads to an obvious decrease in power conversion efficiency (PCE) and flexibility in the SnO2‐based PSCs. This limitation has severely hindered the large‐scale implementation of flexible PSCs. Herein, polydopamine is introduced in SnO2 as “depletion intermediary”, which significantly improves the interfacial contact and mitigates the inherent brittleness of SnO2 film. The obtained PSCs have achieved a PCE of 22.70% and 21.04% based on the rigid and flexible devices, respectively. Most importantly, the flexibility has been largely improved, that after 3000 bending cycles with a 5 mm bending radius, approximately 87% of its original efficiency has been retained.

Funder

Basic and Applied Basic Research Foundation of Guangdong Province

Postdoctoral Research Foundation of China

Guangdong Provincial Engineering Technology Research Center for Transparent Conductive Materials

Publisher

Wiley

Subject

Electrical and Electronic Engineering,Energy Engineering and Power Technology,Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials

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