Reference : Effects of Annealing and Light on Co-evaporated Methylammonium Lead Iodide Perovskite...

	Document type :	Scientific congresses, symposiums and conference proceedings : Paper published in a journal
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Physics
	Focus Areas :	Physics and Materials Science
	To cite this reference:	http://hdl.handle.net/10993/42825

Title :	Effects of Annealing and Light on Co-evaporated Methylammonium Lead Iodide Perovskites using Kelvin Probe Force Microscopy in Ultra-High Vacuum
Language :	English
Author, co-author :	Gallet, Thibaut [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit]
	Martin Lanzoni, Evandro [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >]
	Redinger, Alex [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit]
Publication date :	6-Feb-2020
Journal title :	2019 IEEE 46th Photovoltaic Specialists Conference (PVSC)
Pages :	1477-1482
Peer reviewed :	Yes
Audience :	International
ISSN :	0160-8371
Event name :	2019 IEEE 46th Photovoltaic Specialists Conference (PVSC)
Event date :	from 16-06-2019 to 21-06-2019
Event organizer :	IEEE
Event place (city) :	Chicago
Event country :	United States
Keywords :	[en] perovskite ; kelvin probe force microscopy ; surface photovoltage
Abstract :	[en] Careful surface analysis is essential to understand the electronic and ionic behaviors in perovskite absorbers. In this contribution we discuss Kelvin probe force microscopy performed in ultra-high vacuum on as-grown and annealed co-evaporated methylammonium lead iodide perovskite thin films. By comparing the contact potential difference upon annealing and illumination, we find that annealing increases the average workfunction, indicating a change either in doping or in surface composition. Illumination also increases the average workfunction, indicating a p-type absorber, by reducing band bending as the photo-generated carriers screen the surface states. The effect of light shows a two-step process, with a first fast trend, linked to the surface photovoltage and a second slower trend indicating a possible redistribution of mobile charges.
Funders :	Fonds National de la Recherche - FnR
Target :	Researchers ; Professionals ; Students
Permalink :	http://hdl.handle.net/10993/42825
DOI :	10.1109/PVSC40753.2019.8980602
Other URL :	https://ieeexplore.ieee.org/document/8980602
FnR project :	FnR ; FNR11244141 > Alex Redinger > SUNSPOT > Surface and interface science on photovoltaic materials > 15/03/2017 > 14/03/2022 > 2016

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