Year: 2023
Type: article
Abstract: Formamidinium lead iodide (FAPbI3) perovskite possesses an ideal optical bandgap and is a potential material for fabricating the most efficient single‐junction perovskite solar cells (PSCs). Nevertheless, large formamidinium (FA) cations result in residual lattice strain, which reduces the power conversion efficiency (PCE) and operational stability of PSCs. Herein, the modulation of lattice strain in FAPbI3 crystals via a π‐conjugated organic amine, i.e., 4‐pyrene oxy butylamine (PYBA), is proposed. PYBA pairs at the grain boundary serve as a template for the crystallization of FAPbI3 perovskite, thereby inducing a highly oriented crystal and a pure α‐phase film. The PYBA pairs with strong π–π interactions provide a solid fulcrum for external compression strain, thus compensating for the inherent tension strain of FAPbI3 crystals. The strain release elevates the valence band of the perovskite crystals, thereby decreasing the bandgap and trap density. Consequently, the PYBA‐regulated FAPbI3 PSC achieves an excellent PCE of 24.76%. Moreover, the resulting device exhibits improves operational stability and maintains over 80% of its initial PCE after 1500 h under maximum power point tracking conditions.
Source: Advanced Materials
Authors: Rui Wang, Xinhao Li, Jiahui Qi, Chao Su, Jien Yang, Shaopeng Yang, Mingjian Yuan, Tingwei He
Institutions: Hebei University, Henan Normal University, Nankai University
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: bronze
Funder: Hebei University
Award: G1989540251
OpenAlex ID: W4380870515