期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 2, 页码 1781-1791出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b17781
关键词
PbI2 precursor films; surface layer; morphology; modification; intermediate phase
资金
- National Basic Research Program of China [2016YFA0202400]
- 111 Project [B16016]
- Science and Technology Commission of Beijing Municipality, China [Z141100003314003]
- Project of Scientific and Technological Support Program in Jiang Su Province [BE2014147-X]
- National High Technology Research and Development Program of China (863 Program) [2015AA050602]
- National Key Basic Research Program of China (973 Program) [2015CB932201]
- National Natural Science Foundation of China [51572080, 51372083, 51772095, 5573042, 21303049, 51303052, 51702096]
- Fundamental Research Funds for the Central Universities [2014ZZD07, 2015ZZD06, 2014MS35]
- National Basic Research Program of China [2016YFA0202400]
- 111 Project [B16016]
- Science and Technology Commission of Beijing Municipality, China [Z141100003314003]
- Project of Scientific and Technological Support Program in Jiang Su Province [BE2014147-X]
- National High Technology Research and Development Program of China (863 Program) [2015AA050602]
- National Key Basic Research Program of China (973 Program) [2015CB932201]
- National Natural Science Foundation of China [51572080, 51372083, 51772095, 5573042, 21303049, 51303052, 51702096]
- Fundamental Research Funds for the Central Universities [2014ZZD07, 2015ZZD06, 2014MS35]
Morphology regulation is vital to obtain high-performance perovskite films. Vapor-assisted deposition provides a simple approach to prepare perovskite films with controlled vapor-solid reaction. However, dense PbI2 precursor films with large crystal grains make it difficult for organic molecules to diffuse and interact with inner PbI2 frame. Here, a surface modification process is developed to optimize the surface layer morphology of PbI2 precursor films and lower the resistance of the induced period in crystallization. The vapor optimization time is shortened to several seconds, and the intermediate phase forms on the surface layer of PbI2 films. We achieve porous PbI2 surface with smaller grains through dimethyl sulfoxide vapor treatment, which promotes the migration and reaction rate between CH3NH3I vapor and PbI2 layer. The PbI2 precursor films undergo dramatic morphological evolution due to the formed intermediate phase on PbI2 surface layer. Taking advantage of the proposed surface modification process, we achieve high-quality uniform perovskite films with larger crystal grains and without residual PbI2. The repeatable perovskite solar cells (PSCs) with modified films exhibit power conversion efficiency of up to 18.43% for planar structure. Moreover, the devices hysteresis because of improved quality and reduced defect states of the films. Our work expands the application of morphology control through forming intermediate phase and demonstrates an effective way to enhance the performance of the PSCs.
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