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Effective Interface Defect Passivation via Employing 1‐Methylbenzimidazole for Highly Efficient and Stable Perovskite Solar Cells
Author(s) -
Zheng Haiying,
Liu Guozhen,
Wu Weiwei,
Xu Huifen,
Pan Xu
Publication year - 2021
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.202101097
Subject(s) - passivation , perovskite (structure) , materials science , energy conversion efficiency , photovoltaic system , chemical engineering , nanotechnology , optoelectronics , layer (electronics) , electrical engineering , engineering
Although the power conversion efficiencies (PCEs) of perovskite solar cells (PSCs) have made great progress, the surface and interface defects still affect their PCE and stability and hinder the commercialization. To overcome this problem, 1‐methylimidazole (1‐MIm) and 1‐methylbenzimidazole (1‐MBIm) were used as the interfacial passivation agents to passivate the defects at surface and interface. The results indicated that, in contrast to 1‐MIm, 1‐MBIm displayed a stronger Lewis coordination interaction with the uncoordinated Pb 2+ to reduce the non‐radiative recombination and also effectively improved the charge transfer capacity of perovskite films due to its strong π–π conjugate interaction, resulting in the better photovoltaic performance. As a result, the PCE of the champion 1‐MBIm PSC was improved from 19.48 (pristine) to 21.22 % with a dramatically enhanced open‐circuit voltage ( V oc =1.15 V). More importantly, a significant improvement in long‐term stability was achieved for 1‐MBIm perovskite devices, which was attributed to the high‐quality perovskite film caused by the strong passivation effect of 1‐MBIm and the hydrogen bond with water molecules. The results offers an efficient and facile strategy by interface engineering to fabricate high‐performance and stable PSCs for commercial application.