Open AccessSolvent and Intermediate Phase as Boosters for the Perovskite Transformation and Solar Cell Performance
Author(s) -
Jinhyun Kim,
Taehyun Hwang,
Sangheon Lee,
Byung-Ho Lee,
Jaewon Kim,
Gil Su Jang,
Seunghoon Nam,
Byungwoo Park
Publication year - 2016
Publication title -
scientific reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.24
H-Index - 213
ISSN - 2045-2322
DOI - 10.1038/srep25648
Subject(s) - crystallinity , perovskite (structure) , energy conversion efficiency , materials science , diffusion , chemical engineering , phase (matter) , transformation (genetics) , ethanol , solvent , chemistry , optoelectronics , organic chemistry , composite material , thermodynamics , biochemistry , physics , gene , engineering
High power conversion efficiency and device stabilization are two major challenges for CH 3 NH 3 PbI 3 (MAPbI 3 ) perovskite solar cells to be commercialized. Herein, we demonstrate a diffusion-engineered perovskite synthesis method using MAI/ethanol dipping, and compared it to the conventional synthesis method from MAI/iso-propanol. Diffusion of MAI/C 2 H 5 OH into the PbCl 2 film was observed to be more favorable than that of MAI/C 3 H 7 OH. Facile perovskite conversion from ethanol and highly-crystalline MAPbI 3 with minimized impurities boosted the efficiency from 5.86% to 9.51%. Additionally, we further identified the intermediates and thereby the reaction mechanisms of PbCl 2 converting into MAPbI 3 . Through straightforward engineering to enhance the surface morphology as well as the crystallinity of the perovskite with even faster conversion, an initial power conversion efficiency of 11.23% was obtained, in addition to superior stability after 30 days under an ambient condition.
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