Work

Synergistic Passivation of Pyridinium Tetrafluoroborate (PyBF4) in Inverted (CsPbI3)0.05((FAPbI3)1−x(MAPbBr3)x)0.95 Solar Cells with Atomic Layer Deposited NiO Layers

Year: 2024

Type: article

Abstract: Nickel oxide (NiO) is a promising hole transport layer (HTL) that can be used to fabricate efficient, large‐scale inverted‐type perovskite solar cells (PSCs). However, depositing a high‐quality perovskite layer on NiO substrates comparable to those realized in the normal structure still presents a challenge. Herein, a pyridinium tetrafluoroborate (PyBF4) additive is introduced to passivate the intrinsic defects in the bulk perovskite films. The nitrogen Lewis base in the PyBF4 molecule interacts well with uncoordinated Pb2+ cations, leading to high‐quality perovskite films with minimized defects. Meanwhile, the pseudohalide BF4− can fill halogen vacancies in the perovskite films to enable defect passivation. As a result, the perovskite precursor solution with PyBF4 shows better reproducibility for high‐efficiency devices. The optimal PSC based on PyBF4 modification yields a champion power conversion efficiency of 22.7% with atomic layer deposited NiO as the HTL.

Source: Solar RRL

DOI: 10.1002/solr.202400765