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Fabrication of Perovskite Uniform Film in Air via Introduction of Aniline Cations
Author(s) -
Wang Lin,
Zhang Zhixin,
Wang Bin,
Zhang Jingbo
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201800771
Subject(s) - perovskite (structure) , photocurrent , aniline , materials science , halide , energy conversion efficiency , chemical engineering , nanocrystalline material , inorganic chemistry , chemistry , nanotechnology , organic chemistry , optoelectronics , engineering
Abstract Alkylammonium lead(II) halide (APbX 3 ) perovskite is developed to be the most potential light absorbing material in the photovoltaic field. However it is sensitive to water and oxygen, and the perovskite uniform film is difficult to be prepared in atmospheric environment. Here, CH 3 NH 3 PbI 3 perovskite uniform layer was prepared in ambient environment via adding aniline cations in the methylamine deposition solution of the perovskite layer. XRD results indicate 3D crystalline structure of CH 3 NH 3 PbI 3 perovskite is remained in the case of addition of the low concentration of aniline cations. With the addition increasing of aniline cations, 2D crystalline structure of (C 6 H 5 ‐NH 3 ) 2 PbI 4 is gradually formed. SEM images indicate that the introduction of aniline cations obviously improves the coverage of CH 3 NH 3 PbI 3 perovskite on nanocrystalline TiO 2 thin film. The short circuit photocurrent and power conversion efficiency of perovskite solar cell based on the mixed perovskite were enhanced. The perovskite solar cell fabricated with the optimized molar ratio of aniline cations shows a short circuit photocurrent density of 17.1 mA⋅cm −2 and power conversion efficiency of 5.7%, which is 28% higher than that of the device based on pure CH 3 NH 3 PbI 3 perovskite. The photovoltaic performance enhancement of perovskite solar cell is due to the formation of perovskite uniform layer as aniline cations are introduced, which suppresses the possible recombination processes.