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Effects of Annealing and Light on Co-evaporated Methylammonium Lead Iodide Perovskites using Kelvin Probe Force Microscopy in Ultra-High Vacuum
Gallet, Thibaut; Martin Lanzoni, Evandro; Redinger, Alex
2020In 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC), p. 1477-1482
Peer reviewed
 

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Keywords :
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.
Disciplines :
Physics
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
External co-authors :
no
Language :
English
Title :
Effects of Annealing and Light on Co-evaporated Methylammonium Lead Iodide Perovskites using Kelvin Probe Force Microscopy in Ultra-High Vacuum
Publication date :
06 February 2020
Event name :
2019 IEEE 46th Photovoltaic Specialists Conference (PVSC)
Event organizer :
IEEE
Event place :
Chicago, United States
Event date :
from 16-06-2019 to 21-06-2019
Audience :
International
Journal title :
2019 IEEE 46th Photovoltaic Specialists Conference (PVSC)
ISSN :
0160-8371
Pages :
1477-1482
Peer reviewed :
Peer reviewed
Focus Area :
Physics and Materials Science
FnR Project :
FNR11244141 - Surface And Interface Science On Photovoltaic Materials, 2016 (15/03/2017-14/09/2022) - Alex Redinger
Funders :
FNR - Fonds National de la Recherche [LU]
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since 24 March 2020

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