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Proceedings Paper

Crystallization of perovskite film using ambient moisture and water as co-solvent for efficient planar perovskite solar cell (Conference Presentation)
Author(s): Ashish Dubey; Khan M. Reza; Eman Gaml; Nirmal Adhikari; Qiquan Qiao

Paper Abstract

Smooth, compact and defect free morphology of perovskite is highly desired for enhanced device performance. Several routes such as thermal annealing, use of solvent mixtures, growth under controlled humidity has been adopted to obtain crystalline, smooth and defect free perovskite film. Herein we showed direct use of water (H2O) as co-solvent in precursor solution and have optimized the water content required to obtain smooth and dense film. Varying concentration of water was used in precursor solution of CH3NH3I and PbI2 mixed in γ-butyrolactone (GBL) and dimethylsulfoxide (DMSO). Perovskite films were crystallized using toluene assisted solvent engineering method using GBL:DMSO:H2O as solvent mixture. The amount of water was varied from 1% to 25%, which resulted in change in film morphology and perovskite crystallinity. It was concluded that an appropriate amount of water is required to assist the crystallization process to obtain smooth pin-hole free morphology. The change in morphology led to improved fill factor in the device, with highest efficiency ~14%, which was significantly higher than devices made from perovskite film without adding water. We also showed that addition of up to 25% by volume of water does not significantly change the device performance.

Paper Details

Date Published: 2 November 2016
PDF: 1 pages
Proc. SPIE 9936, Thin Films for Solar and Energy Technology VIII, 99360D (2 November 2016); doi: 10.1117/12.2238334
Show Author Affiliations
Ashish Dubey, South Dakota State Univ. (United States)
Khan M. Reza, South Dakota State Univ. (United States)
Eman Gaml, South Dakota State Univ. (United States)
Nirmal Adhikari, South Dakota State Univ. (United States)
Qiquan Qiao, South Dakota State Univ. (United States)

Published in SPIE Proceedings Vol. 9936:
Thin Films for Solar and Energy Technology VIII
Michael J. Heben; Mowafak M. Al-Jassim, Editor(s)

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