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Title: Impacts of alkaline on the defects property and crystallization kinetics in perovskite solar cells
Authors: Chen, YH
Li, NX
Wang, LG
Li, L
Xu, ZQ
Jiao, HY
Liu, PF
Zhu, C
Zai, HC
Sun, MZ 
Zou, W
Zhang, S
Xing, GC
Liu, XF
Wang, JP
Li, DD
Huang, BL 
Chen, Q
Zhou, HP
Issue Date: 2019
Publisher: Nature Publishing Group
Source: Nature communications, 7 Mar. 2019, v. 10, 1112, p. 1-10 How to cite?
Journal: Nature communications 
Abstract: Further minimizing the defect state density in the semiconducting absorber is vital to boost the power conversion efficiency of solar cells approaching Shockley-Queisser limit. However, it lacks a general strategy to control the precursor chemistry for defects density reduction in the family of iodine based perovskite. Here the alkaline environment in precursor solution is carefully investigated as an effective parameter to suppress the incident iodine and affects the crystallization kinetics during film fabrication, via rationale adjustment of the alkalinity of additives. Especially, a 'residual free' weak alkaline is proposed not only to shrink the bandgap of the absorber by modulating the stoichiometry of organic cation, but also to improve the open circuit voltage in the resultant device. Consequently, the certified efficiency of 20.87% (Newport) is achieved with one of the smallest voltage deficits of 413 mV in the planar heterojunction perovskite solar cell.
EISSN: 2041-1723
DOI: 10.1038/s41467-019-09093-1
Rights: Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit
© The Author(s) 2019
The following publication Chen, Y. H., Li, N. X., Wang, L. G., Li, L., Xu, Z. Q., Jiao, H. Y., ... & Zhou, H. P. (2019). Impacts of alkaline on the defects property and crystallization kinetics in perovskite solar cells. Nature communications, 10(1), 1112, 1-10 is available at
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