Journal
RSC ADVANCES
Volume 5, Issue 127, Pages 104606-104611Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra25160e
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Funding
- National High-tech R&D Program of China (863 Program) [2015AA034601]
- National Natural Science Foundation of China [91333122, 51402106, 51372082, 51172069, 50972032, 61204064, 51202067]
- PhD Programs Foundation of Ministry of Education of China [20110036110006, 20120036120006, 20130036110012]
- Par-Eu Scholars Program
- Fundamental Research Funds for the Central Universities
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Using a dimethylsulfoxide (DMSO)-based PbI2 precursor solution and employing PbCl2 as an additive, organolead halide perovskite films were fabricated via a sequential solution deposition process. It is found that the PbCl2 additive in DMSO system dramatically improves the properties of the resultant perovskite films, including the crack-free morphology and enhanced light absorption, while its crystalline structure is not altered. Under the conditions of 30 mol% PbCl2 doping, the films exhibit a high uniformity and an optimum light harvesting capability; as-prepared solar cells achieve the highest power conversion efficiency of 14.42%, which is 36.3% higher than that of the pure PbI2-based one. The cells employ nanocrystalline rutile titania as the contact layer deposited by a chemical bath deposition method, contributing to preparing the devices at a low temperature less than or equal to 100 degrees C. This work provides a simple, low-cost but effective strategy to improve the power efficiency of the perovskite solar cells.
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