Affiliation:
1. School of Materials Science and Chemical Engineering Ningbo University Ningbo 315211 China
2. Zhejiang Provincial Engineering Research Center of Energy Optoelectronic Materials and Devices Ningbo Institute of Materials Technology & Engineering Chinese Academy of Sciences Ningbo 315201 China
3. Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 China
Abstract
As is well known, the interface of perovskite solar cells (PSCs) is rich in deep‐level carrier traps, which act as non‐radiative recombination centers and limit the open‐circuit voltage (VOC) and power conversion efficiency (PCE) of PSCs. Defect chemistry and surface passivation agents have been extensively studied, primarily focusing on the neutralization of non‐coordinated lead or anion defects. Herein, a novel methoxy‐based passivator 4‐methoxyphenethylammonium iodide (p‐MeOPEAI) is introduced for a multifunctional passivation effect at the perovskite interface. It is susceptible for p‐MeOPEAI to form 2D perovskite on top of 3D perovskite, and it interacts with the surface of 3D perovskite in multiple ways, forming a 3D/2D structure that facilitates charge transfer and p‐MeOPEAI passivates the uncoordinated Pb2+ ions of the perovskite film surface. The interface defects in the PSCs are well passivated, minimizing non‐radiative recombination and enhancing device performance. As a result, a champion PCE of 23.3% is achieved for flexible PSCs with a high VOC (1.2 V). In addition, modified devices also show enhanced operational mechanical stability (retention of >80% initial PCE after 10 000 bending cycles).
Funder
National Natural Science Foundation of China
National Science Fund for Distinguished Young Scholars
Subject
Electrical and Electronic Engineering,Energy Engineering and Power Technology,Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials