Intensity Modulated Photocurrent Microspectrosopy for Next Generation Photovoltaics

Jamie S. Laird; Sandheep Ravishankar; Kevin J. Rietwyk; Wenxin Mao; Udo Bach; Trevor A. Smith

doi:10.1002/smtd.202200493

Intensity Modulated Photocurrent Microspectrosopy for Next Generation Photovoltaics

Jamie S. Laird, Sandheep Ravishankar, Kevin J. Rietwyk, Wenxin Mao, Udo Bach, Trevor A. Smith

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

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.

Original language	English
Article number	2200493
Journal	Small Methods
Volume	6
Issue number	9
DOIs	https://doi.org/10.1002/smtd.202200493
State	Published - 20 Sep 2022
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2022 The Authors. Small Methods published by Wiley-VCH GmbH.

Funding

All authors except S.R acknowledge the Centre of Excellence in Exciton Science funded by the Australian Research Council (ARC) (project No CE170100026). S.R. acknowledges the German Research Foundation (DFG) for support through a Walter‐Benjamin fellowship (Project No. 462572437). All authors except S.R acknowledge the Centre of Excellence in Exciton Science funded by the Australian Research Council (ARC) (project No CE170100026). S.R. acknowledges the German Research Foundation (DFG) for support through a Walter-Benjamin fellowship (Project No. 462572437). Open access publishing facilitated by The University of Melbourne, as part of the Wiley - The University of Melbourne agreement via the Council of Australian University Librarians.

Funders	Funder number
Australian University Librarians
Australian Research Council	CE170100026
Deutsche Forschungsgemeinschaft	462572437
University of Melbourne

Keywords

intensity modulated photocurrent spectroscopy
laser beam induced current
metal halide perovskites
perovskite solar cells
photocurrent mapping
power conversion efficiency

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10.1002/smtd.202200493

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title = "Intensity Modulated Photocurrent Microspectrosopy for Next Generation Photovoltaics",

abstract = "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.",

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author = "Laird, {Jamie S.} and Sandheep Ravishankar and Rietwyk, {Kevin J.} and Wenxin Mao and Udo Bach and Smith, {Trevor A.}",

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Intensity Modulated Photocurrent Microspectrosopy for Next Generation Photovoltaics

Abstract

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Keywords

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