Perovskite Passivation with a Bifunctional Molecule 1, 2‐Benzisothiazolin‐3‐One for Efficient and Stable Planar Solar Cells. Issue 10 (21st August 2021)

• Record Type: Journal Article
• Authors: Song, Qi; Gong, Hongkang; Ji, Chao; Zhang, Huimin; Sun, Fulin; You, Fangtian; He, Zhiqun; Li, Dan; Liang, Chunjun
• Is Part Of: Solar RRL. Volume 5:Issue 10(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-08-21
• Subjects: bifunctional molecules -- 1, 2-benzisothiazolin-3-one -- passivation -- perovskites -- solar cells; Solar energy -- Periodicals; Photovoltaic power generation -- Periodicals; Solar energy -- Research -- Periodicals; Photovoltaic power generation -- Research -- Periodicals; Periodicals; 333.7923
• DOI: 10.1002/solr.202100472
• Languages: English
• ISSNs: 2367-198X

Abstract

Abstract : Even though the perovskite material itself has a high defect tolerance compared with other semiconductors, the defects existing at grain boundaries (GBs) or the surface still cause high densities of the trap state which impair the efficiency and stability of perovskite solar cells (PSCs). Herein, the small molecule 1, 2‐benzisothiazolin‐3‐one (BIT) is investigated to passivate the defects at the GBs and surface of perovskite films. The results reveal that the BIT molecule belongs to a type of bifunctional species, which functions as cations and anions to passivate the perovskite surface. The BIT passivation generates lower formation energy and a more stable perovskite structure, resulting in improved performance and stability of the PSCs. The power conversion efficiency (PCE) of the optimized inverted photovoltaic device reaches 21.83%. Meanwhile, high photostability is achieved for PSCs with an efficiency drop of less than 10% under continuous light illumination over 500 h. Abstract : The small bifunctional molecule 1, 2‐benzisothiazolin‐3‐one (BIT) is used as an additive and coverage layer, respectively, to enhance the performance and stability of the perovskite device. Both theoretical calculation and characterization of specimens indicate that the trap defect states are suppressed. The result of passivation strategy demonstrates a substantial enhancement in solar cell performance and stability.