Pyridine Controlled Tin Perovskite Crystallization

Controlling the crystallization of perovskite in a thin film is essential in making solar cells. Processing tin-based perovskite films from solution is challenging because of the uncontrollable faster crystallization of tin than the most used lead perovskite. The best performing devices are prepared...

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Published in:ACS energy letters 2022-10, Vol.7 (10), p.3197-3203
Main Authors: Nasti, Giuseppe, Aldamasy, Mahmoud Hussein, Flatken, Marion Alwine, Musto, Pellegrino, Matczak, Piotr, Dallmann, André, Hoell, Armin, Musiienko, Artem, Hempel, Hannes, Aktas, Ece, Di Girolamo, Diego, Pascual, Jorge, Li, Guixiang, Li, Meng, Mercaldo, Lucia Vittoria, Veneri, Paola Delli, Abate, Antonio
Format: Article
Language:English
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Letter
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Summary:Controlling the crystallization of perovskite in a thin film is essential in making solar cells. Processing tin-based perovskite films from solution is challenging because of the uncontrollable faster crystallization of tin than the most used lead perovskite. The best performing devices are prepared by depositing perovskite from dimethyl sulfoxide because it slows down the assembly of the tin–iodine network that forms perovskite. However, while dimethyl sulfoxide seems the best solution to control the crystallization, it oxidizes tin during processing. This work demonstrates that 4-(tert-butyl) pyridine can replace dimethyl sulfoxide to control the crystallization without oxidizing tin. We show that tin perovskite films deposited from pyridine have a 1 order of magnitude lower defect density, which promotes charge mobility and photovoltaic performance.
ISSN:2380-8195
2380-8195
DOI:10.1021/acsenergylett.2c01749