Formation, location and beneficial role of PbI2 in lead halide perovskite solar cells

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Title: Formation, location and beneficial role of PbI2 in lead halide perovskite solar cells
Authors: Du, T
Burgess, C
Kim, J
Zhang, J
Durrant, J
McLachlan, MA
Item Type: Journal Article
Abstract: Here we report the investigation of controlled PbI2 secondary phase formation in CH3NH3PbI3 (MAPI) photovoltaics through post-deposition thermal annealing, highlighting the beneficial role of PbI2 on device performance. Using high-resolution transmission electron microscopy we show the location of PbI2 within the active layer and propose a nucleation and growth mechanism. We discover that during the annealing that PbI2 forms mainly in the grain boundary regions of the MAPI films and that at certain temperatures the PbI2 formed can be highly beneficial to device performance – reducing current–voltage hysteresis and increasing the power conversion efficiency. Our analysis shows that the MAPI grain boundaries as susceptible areas that, under thermal loading, initiate the conversion of MAPI into PbI2.
Issue Date: 24-Jan-2017
Date of Acceptance: 19-Jan-2017
ISSN: 2398-4902
Publisher: Royal Society of Chemistry
Start Page: 119
End Page: 126
Journal / Book Title: Sustainable Energy & Fuels
Volume: 1
Copyright Statement: This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
Sponsor/Funder: Engineering & Physical Science Research Council (E
Engineering & Physical Science Research Council (E
Funder's Grant Number: EP/M023532/1
Publication Status: Published
Appears in Collections:Faculty of Engineering
Faculty of Natural Sciences

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