%0 Journal Article
%A Laird, Jamie S.
%A Ravishankar, Sandheep
%A Rietwyk, Kevin J.
%A Mao, Wenxin
%A Bach, Udo
%A Smith, Trevor A.
%T Intensity Modulated Photocurrent Microspectrosopy for Next Generation Photovoltaics
%J Small methods
%V 6
%N 9
%@ 2366-9608
%C Weinheim
%I WILEY-VCH Verlag GmbH & Co. KGaA
%M FZJ-2022-03247
%P 2200493
%D 2022
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%$ 35973943
%U <Go to ISI:>//WOS:000840898300001
%R 10.1002/smtd.202200493
%U https://juser.fz-juelich.de/record/909558