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Heterojunction In Situ Constructed by a Novel Amino Acid-Based Organic Spacer for Efficient and Stable Perovskite Solar Cells

Abstract : The optical properties and stability of metal halide perovskites can be improved by reducing their dimensionality. Since defects at the perovskite film grain body and boundaries cause significant energetic losses by non-radiative recombination, perovskite films with manageable crystal size and macroscopic grains are essential to improve the photovoltaic properties. Through theoretical calculation models and experiments, we show that the carboxyl group of 4-ammonium butyric acidbased cation (4-ABA +) can interact with the three-dimensional (3D) perovskite to produce in-situ a secondary grain growth by post-treatment. It passivates the trap defects and broadens the light absorption. 4-ABA + could induce a 2D capping layer on top of 3D mixed cations-based perovskite to construct 2D /3D heterojunction. The 4-ABA + modified perovskite film consists of large-sized grains with extremely low trap state densities and possesses a longer charge carrier lifetime and good stability, resulting in efficient perovskite solar cells with a champion efficiency of 23.16% and a VOC of 1.20 V. We show that the 4-ABA + treated devices outperform the 3-Ammonium Propionic Acid (3-APA +) and 5-ammonium valeric acid (5-AVA +) treated ones. Moreover, the devices exhibit high stability under high humidity and continuous light soaking conditions. This work gives a hint that our approach based on 4-ABA + treatment is key to achieve better electrical properties, a controlled crystal growth, as well as highly stable perovskite solar cells.
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https://hal-cnrs.archives-ouvertes.fr/hal-03807914
Contributor : Thierry Pauporte Connect in order to contact the contributor
Submitted on : Monday, October 10, 2022 - 11:19:20 AM
Last modification on : Tuesday, October 11, 2022 - 4:08:16 AM

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Boxue Zhang, Deyu Gao, Mengjia Li, Xueni Shang, Ying Li, et al.. Heterojunction In Situ Constructed by a Novel Amino Acid-Based Organic Spacer for Efficient and Stable Perovskite Solar Cells. ACS Applied Materials & Interfaces, 2022, 14 (36), pp.40902-40912. ⟨10.1021/acsami.2c09926⟩. ⟨hal-03807914⟩

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