NDLI: Synergistic improvements in stability and performance of lead iodide perovskite solar cells incorporating salt additives

Content Provider	Royal Society of Chemistry (RSC)
Author	Mohan, Ramesh Ho, Kuo-Chuan Budiawan, Widhya Lee, Chih-Hao Chu, Chih-Wei Boopathi, Karunakara Moorthy Huang, Tzu-Yen Lin, Ming-Yi
Copyright Year	2016
Abstract	The main issues in planar perovskite solar cells are the coverage and crystallinity of the perovskite film on the PEDOT:PSS layer. To enhance these features, we introduced alkali metal halides (salts) as additives into the perovskite precursor solution used in a two-step preparation method. These alkali metal halides chelate with Pb2+ ions and enhance the crystal growth of PbI2 films, resulting in nanostructured morphologies. The nanostructured PbI2 films promote homogeneous nucleation and larger crystallite sizes, thereby enhancing the morphology and crystallinity of the perovskite films. The alkali metal halides recrystallize the small grains and passivate the grain boundaries and interface states, allowing effective charge generation and dissociation in perovskite films. Photoluminescence measurements indicated that perovskite films prepared with salt additives featured fewer charge traps and defects. The power conversion efficiency of the device incorporating a small amount of a salt additive increased by approximately 33%—from 11.4 to 15.08%. This device was more stable than a corresponding device prepared without the additive, with only 16.5% degradation occurring over a period of 50 days.
Starting Page	1591
Ending Page	1597
Page Count	7
File Format	HTM / HTML PDF
ISSN	20507488
Volume Number	4
Issue Number	5
Journal	Journal of Materials Chemistry A
DOI	10.1039/c5ta10288j
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Perovskite Poly(3 4-ethylenedioxythiophene) Alkali metal Lead(II) iodide Nucleation Crystallite Grain boundary Dissociative Photoluminescence
Content Type	Text
Resource Type	Article
Subject	Chemistry Renewable Energy, Sustainability and the Environment Materials Science

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