Excitation density dependent photoluminescence quenching and charge transfer efficiencies in hybrid perovskite/organic semiconductor bilayers

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Title: Excitation density dependent photoluminescence quenching and charge transfer efficiencies in hybrid perovskite/organic semiconductor bilayers
Authors: Kim, J
Godin, R
Dimitrov, SD
Du, T
Bryant, D
McLachlan, MA
Durrant, JR
Item Type: Journal Article
Abstract: This study addresses the dependence of charge transfer efficiency between bilayers of methylammonium lead iodide (MAPI3) with PC61BM or poly(3,4-ethylenedioxythiophene): polystyrene sulfonate (PEDOT:PSS) charge transfer layers on excitation intensity. It analyzes the kinetic competition between interfacial electron/hole transfer and charge trapping and recombination within MAPI3 by employing a range of optical measurements including steady-state (SS) photoluminescence quenching (PLQ), and transient photoluminescence and absorption over a broad range of excitation densities. The results indicate that PLQ measurements with a typical photoluminescence spectrometer can yield significantly different transfer efficiencies to those measured under 1 Sun irradiation. Steady-state and pulsed measurements indicate low transfer efficiencies at low excitation conditions (<5E + 15 cm−3) due to rapid charge trapping and low transfer efficiencies at high excitation conditions (>5E + 17 cm−3) due to fast bimolecular recombination. Efficient transfer to PC61BM or PEDOT:PSS is only observed under intermediate excitation conditions (≈1 Sun irradiation) where electron and hole transfer times are determined to be 36 and 11 ns, respectively. The results are discussed in terms of their relevance to the excitation density dependence of device photocurrent generation, impact of charge trapping on this dependence, and appropriate methodologies to determine charge transfer efficiencies relevant to device performance.
Issue Date: 14-Dec-2018
Date of Acceptance: 1-Oct-2018
URI: http://hdl.handle.net/10044/1/65084
DOI: https://dx.doi.org/10.1002/aenm.201802474
ISSN: 1614-6832
Publisher: Wiley
Journal / Book Title: Advanced Energy Materials
Volume: 8
Issue: 35
Copyright Statement: © 2018 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim. This is the accepted version of the following article: J. Kim, R. Godin, S. D. Dimitrov, T. Du, D. Bryant, M. A. McLachlan, J. R. Durrant, Adv. Energy Mater. 2018, 8, 1802474., which has been published in final form at https://dx.doi.org/10.1002/aenm.201802474
Publication Status: Published
Embargo Date: 2019-10-23
Article Number: 1802474
Online Publication Date: 2018-10-23
Appears in Collections:Faculty of Engineering
Materials
Chemistry
Faculty of Natural Sciences



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