期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 10, 期 42, 页码 16016-16027出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2tc02351b
关键词
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资金
- Taiwan's Bureau of Energy [M455DR1140]
- Ministry of Science and Technology of Taiwan [MOST 107-2221-E-006-190-MY3, MOST 108-2218-E-006-043-MY3, MOST 109-3116-F-006-011, MOST 109-2222-E-260-001-MY3, MOST 110-2221-E-006-200, MOST 111-2113-M-006-009, MOST 111-2221-E-006-061-MY2]
- Hierarchical Green-Energy Materials (Hi-GEM) Research Center, from The Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education (MOE)
- Ministry of Science and Technology in Taiwan [MOST 109-2634-F-006-020]
- Higher Education Sprout Project, Ministry of Education
In this study, mixed-cation and mixed-halide perovskite films were fabricated using a nontoxic solvent system and the crystallization controlling agent 18-crown-6 (18C6) under ambient conditions. The addition of 18C6 effectively reduced the size of the perovskite-based micelles, resulting in a high-quality perovskite film with improved power conversion efficiency (PCE) in perovskite solar cells (PSCs).
Deposition of a large-area metal halide perovskite (MHP) film for perovskite solar cells (PSCs) under ambient conditions is highly required for their commercial applications. In this study, we fabricate mixed-cation and mixed-halide perovskite films by doctor-blade coating with a nontoxic solvent system under ambient conditions (a relative humidity of 40-45%). A crystallization controlling agent 18-crown-6 (18C6) is further added to the multiple-component MHP to improve the film quality. Liquid-phase scanning electron microscopy (L-SEM) is conducted to investigate the effects of 18C6 on the MHP precursor and the doctor-bladed MHP film. The L-SEM image of the pristine MHP precursor reveals self-assembly of micelles, while the addition of 18C6 effectively suppresses the size of the MHP-based micelles in the MHP precursor. Strong coordination between 18C6 and metal cations (such as Cs+ and Pb2+) prevents the MHP-based micelles from segregation, reducing the micellar size from the mu m level (without 18C6) to the sub-mu m level (with 18C6). This effect could result in uniform-sized micelles in the precursor and a reduced crystal growth rate to achieve a high-quality MHP film with preferred crystallinity, an enhanced MHP domain size, and a smooth surface. The agent 18C6 in PSCs significantly improves the power conversion efficiency (PCE) from 7.8% (without 18C6) to 14.7% (with 18C6).
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