TY  - JOUR
AU  - Laird, Jamie S.
AU  - Ravishankar, Sandheep
AU  - Rietwyk, Kevin J.
AU  - Mao, Wenxin
AU  - Bach, Udo
AU  - Smith, Trevor A.
TI  - Intensity Modulated Photocurrent Microspectrosopy for Next Generation Photovoltaics
JO  - Small methods
VL  - 6
IS  - 9
SN  - 2366-9608
CY  - Weinheim
PB  - WILEY-VCH Verlag GmbH & Co. KGaA
M1  - FZJ-2022-03247
SP  - 2200493
PY  - 2022
AB  - In this report, a large-area laser beam induced current microscope that has been adapted to perform intensity modulated photocurrent spectroscopy (IMPS) in an imaging mode is described. Microscopy-based IMPS method provides a spatial resolution of the frequency domain response of the solar cell, allowing correlation of the optoelectronic response with a particular interface, bulk material, specific transport layer, or transport parameter. The system is applied to study degradation effects in back-contact perovskite cells where it is found to readily differentiate areas based on their markedly different frequency response. Using the diffusion-recombination model, the IMPS response is modeled for a sandwich structure and extended for the special case of lateral diffusion in a back-contact cell. In the low-frequency limit, the model is used to calculate spatial maps of the carrier ambipolar diffusion length. The observed frequency response of IMPS images is then discussed.
LB  - PUB:(DE-HGF)16
C6  - 35973943
UR  - <Go to ISI:>//WOS:000840898300001
DO  - DOI:10.1002/smtd.202200493
UR  - https://juser.fz-juelich.de/record/909558
ER  -