Probing and controlling intra-grain crystallinity for improved low-temperature processed perovskite solar cells

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Title: Probing and controlling intra-grain crystallinity for improved low-temperature processed perovskite solar cells
Authors: Du, T
Burgess, C
Lin, C-T
Eisner, F
Kim, J
Xu, S
Kang, H
Durrant, J
McLachlan, M
Item Type: Journal Article
Abstract: Here, previously unobserved nanoscale defects residing within individual grains of solution‐processed methylammonium lead tri‐iodide (CH3NH3PbI3, MAPI) thin films are identified. Using scanning transmission electron microscopy (STEM), the defects inherently associated with the established solution‐processing methodology are identified, and a facile processing modification to eliminate these defects is introduced. Specifically, defect elimination is achieved by coannealing the as‐deposited MAPI layer with the electron transport layer (phenyl‐C61‐butyric acid methyl, PCBM) resulting in devices that significantly outperform devices prepared using the established methodology—with power conversion efficiencies increasing from 13.6% to 17.4%. The use of transmission electron microscopy allows the correlation of performance enhancements to improved intragrain crystallinity and shows that highly coherent crystallographic orientation results within individual grains when processing is modified. Detailed optoelectronic characterization reveals that the improved intragrain crystallinity drives an improvement of charge collection and a reduction of PEDOT:PSS/perovskite interfacial recombination. The study suggests that the microstructural defects in MAPI, owing to a lack of structural coherence throughout the thickness of thin film, are a significant cause of interfacial recombination.
Issue Date: 17-Dec-2018
Date of Acceptance: 1-Oct-2018
URI: http://hdl.handle.net/10044/1/65195
DOI: https://dx.doi.org/10.1002/adfm.201803943
ISSN: 1616-301X
Publisher: Wiley
Journal / Book Title: Advanced Functional Materials
Volume: 28
Issue: 51
Copyright Statement: © 2018 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim. This is the accepted version of the following article: T. Du, C. H. Burgess, C.‐T. Lin, F. Eisner, J. Kim, S. Xu, H. Kang, J. R. Durrant, M. A. McLachlan, Adv. Funct. Mater. 2018, 28, 1803943, which has been published in final form at https://dx.doi.org/10.1002/adfm.201803943
Sponsor/Funder: Engineering & Physical Science Research Council (E
Funder's Grant Number: N/A
Keywords: 03 Chemical Sciences
09 Engineering
02 Physical Sciences
Materials
Publication Status: Published
Embargo Date: 2019-11-04
Article Number: 1803943
Online Publication Date: 2018-11-04
Appears in Collections:Faculty of Engineering
Materials
Physics
Chemistry
Faculty of Natural Sciences



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