Reference : Effects of Annealing and Light on Co-evaporated Methylammonium Lead Iodide Perovskite...
Scientific congresses, symposiums and conference proceedings : Paper published in a journal
Physical, chemical, mathematical & earth Sciences : Physics
Physics and Materials Science
http://hdl.handle.net/10993/42825
Effects of Annealing and Light on Co-evaporated Methylammonium Lead Iodide Perovskites using Kelvin Probe Force Microscopy in Ultra-High Vacuum
English
Gallet, Thibaut mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit]
Martin Lanzoni, Evandro mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >]
Redinger, Alex mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit]
6-Feb-2020
2019 IEEE 46th Photovoltaic Specialists Conference (PVSC)
1477-1482
Yes
International
0160-8371
2019 IEEE 46th Photovoltaic Specialists Conference (PVSC)
from 16-06-2019 to 21-06-2019
IEEE
Chicago
United States
[en] perovskite ; kelvin probe force microscopy ; surface photovoltage
[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.
Fonds National de la Recherche - FnR
Researchers ; Professionals ; Students
http://hdl.handle.net/10993/42825
10.1109/PVSC40753.2019.8980602
https://ieeexplore.ieee.org/document/8980602
FnR ; FNR11244141 > Alex Redinger > SUNSPOT > Surface and interface science on photovoltaic materials > 15/03/2017 > 14/03/2022 > 2016

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