Mitigating Defect States of All‐Inorganic CsPbI2Br Perovskite via Multifunctional 2‐Amino‐5‐Nitrothiazole Additive for an Efficient Air‐Processed Outdoor/Indoor Photovoltaics

• DOI: 10.1002/solr.202300912
• Publication Date: 2024-01-04T02:58:10Z
• Authors: Jitendra Bahadur; SungWon Cho; Padmini Pandey; Saemon Yoon; Dong‐Gun Lee; Jun Ryu; Jun Tae Song; Jongchul Lim; Dong‐Won Kang
• Keywords: 01 natural sciences; 0104 chemical sciences

All‐inorganic CsPbI 2 Br mixed halide perovskites show promise as wide‐bandgap photoabsorbers in photovoltaics. However, the rapid crystal growth observed solution‐processed often leads to morphologies plagued by pinholes and defects, which limit device performance. This study introduces 2‐Amino‐5‐nitrothiazole (ANT), an innovative precursor additive, enhance film quality. ANT's selective interactions with perovskite moderate growth, resulting a dense, flawless characterized superior crystallinity coverage. Furthermore, NH group ANT coordinates Pb octahedra, effectively mitigating charge defects through NHI/Br bonds. Simultaneously, SCN sites interact uncoordinated 2+ ions, reducing defect states nonradiative recombination. innovation achieves impressive efficiency of 17.13% fill factor (FF) 83.41%, surpassing control's 15.21% (FF 80.45%). Notably, champion maintains 29.47% under indoor light‐emitting diode lighting at 1000 lux. Additionally, optimized solar cell demonstrates remarkable stability, retaining ≈90% its for over 720 h 85 °C air, even without encapsulation.