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Suppressing PEDOT:PSS doping-induced interfacial recombination loss in perovskite solar cells

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Title: Suppressing PEDOT:PSS doping-induced interfacial recombination loss in perovskite solar cells
Authors: Chin, Y-C
Daboczi, M
Henderson, C
Luke, J
Kim, J-S
Item Type: Journal Article
Abstract: PEDOT:PSS is widely used as a hole transport layer (HTL) in perovskite solar cells (PSCs) due to its facile processability, industrial scalability, and commercialization potential. However, PSCs utilizing PEDOT:PSS suffer from strong recombination losses compared to other organic HTLs. This results in lower open-circuit voltage (VOC) and power conversion efficiency (PCE). Most studies focus on doping PEDOT:PSS to improve charge extraction, but it has been suggested that a high doping level can cause strong recombination losses. Herein, we systematically dedope PEDOT:PSS with aqueous NaOH, raising its Fermi level by up to 500 meV, and optimize its layer thickness in p-i-n devices. A significant reduction of recombination losses at the dedoped PEDOT:PSS/perovskite interface is evidenced by a longer photoluminescence lifetime and higher magnitude of surface photovoltage, leading to an increased device VOC, fill factor, and PCE. These results provide insights into the relationship between doping level of HTLs and interfacial charge carrier recombination losses.
Date of Acceptance: 5-Jan-2022
URI: http://hdl.handle.net/10044/1/93532
DOI: 10.1021/acsenergylett.1c02577
ISSN: 2380-8195
Publisher: American Chemical Society (ACS)
Start Page: 560
End Page: 568
Journal / Book Title: ACS Energy Letters
Volume: 7
Issue: 2
Copyright Statement: © 2022 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Enrgy Letters, after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acsenergylett.1c02577
Sponsor/Funder: Engineering and Physical Sciences Research Council
National Research Foundation of Korea (NRF)
Engineering and Physical Sciences Research Council
Funder's Grant Number: EP/L016702/1
NRF-2017K1A1A2013153
EP/T028513/1
Keywords: Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Electrochemistry
Energy & Fuels
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Chemistry
Science & Technology - Other Topics
Materials Science
HOLE-TRANSPORT MATERIALS
PSS
POLY(3,4-ETHYLENEDIOXYTHIOPHENE)
EFFICIENCY
LAYER
Publication Status: Published online
Embargo Date: 2023-01-05
Online Publication Date: 2022-01-06
Appears in Collections:Physics
Experimental Solid State
Faculty of Natural Sciences