Journal
SCIENCE BULLETIN
Volume 63, Issue 23, Pages 1591-1596Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.scib.2018.11.004
Keywords
Perovskite; Solution evaporation; High-quality films; Power conversion efficiency
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Funding
- National Natural Science Foundation of China [21872174]
- Project of Innovation-Driven Plan in Central South University [2017CX003]
- State Key Laboratory of Powder Metallurgy in Central South University
- Thousand Youth Talents Plan of China
- Hundred Youth Talents Program of Hunan
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Organic-inorganic hybrid perovskite solar cells (PSCs), due to their high power conversion efficiency (PCE) and low cost, have been considered as one of the most promising photovoltaic devices. Well-distributed large-grain perovskite crystals play an important role for light adsorption and charge transfer. While, high quality perovskite crystals closely relate to the preparation method. Generally, the preparation of perovskite films requires a nitrogen atmosphere and toxic anti-solvents, which hinder their practical applications. Here, we reported a novel and simple solution evaporation process followed with a methylammonium iodide (MAI) solution immersion to prepare high quality perovskite films. Porous lead iodide (PbI2) films were firstly formed by evaporation of PbI2 precursor solution. The obtained porous PbI2 films were completely transformed into well-distributed large-grain perovskite films after a quick MAI solution immersion. As a result, the corresponding PCE was enhanced by 30% compared to that prepared with a regular sequential deposition. This solution evaporation method provides a convenient and practical way for preparing high-quality perovskite films. (C) 2018 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.
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