Minority carrier decay length extraction from scanning photocurrent profiles in two-dimensional carrier transport structures

Abstract Carrier transport was studied both numerically and experimentally using scanning photocurrent microscopy (SPCM) in two-dimensional (2D) transport structures, where the structure size in the third dimension is much smaller than the diffusion length and electrodes cover the whole terminal on...

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Autores principales:	Yu-Chien Wei, Cheng-Hao Chu, Ming-Hua Mao
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/c719d76389f94354be585e0b6619d2cc
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spelling	oai:doaj.org-article:c719d76389f94354be585e0b6619d2cc2021-11-14T12:24:28ZMinority carrier decay length extraction from scanning photocurrent profiles in two-dimensional carrier transport structures10.1038/s41598-021-01446-52045-2322https://doaj.org/article/c719d76389f94354be585e0b6619d2cc2021-11-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-01446-5https://doaj.org/toc/2045-2322Abstract Carrier transport was studied both numerically and experimentally using scanning photocurrent microscopy (SPCM) in two-dimensional (2D) transport structures, where the structure size in the third dimension is much smaller than the diffusion length and electrodes cover the whole terminal on both sides. Originally, one would expect that with increasing width in 2D transport structures, scanning photocurrent profiles will gradually deviate from those of the ideal one-dimensional (1D) transport structure. However, the scanning photocurrent simulation results surprisingly showed almost identical profiles from structures with different widths. In order to clarify this phenomenon, we observed the spatial distribution of carriers. The simulation results indicate that the integrated carrier distribution in the 2D transport structures with finite width can be well described by a simple-exponential-decay function with the carrier decay length as the fitting parameter, just like in the 1D transport structures. For ohmic-contact 2D transport structures, the feasibility of the fitting formula from our previous 1D analytical model was confirmed. On the other hand, the application of a simple-exponential-decay function in scanning photocurrent profiles for the diffusion length extraction in Schottky-contact 2D transport structures was also justified. Furthermore, our simulation results demonstrate that the scanning photocurrent profiles in the ohmic- or Schottky-contact three-dimensional (3D) transport structures with electrodes covering the whole terminal on both sides will reduce to those described by the corresponding 1D fitting formulae. Finally, experimental SPCM on a p-type InGaAs air-bridge two-terminal thin-film device was carried out. The measured photocurrent profiles can be well fitted by the specific fitting formula derived from our previous 1D analytical model and the extracted electron mobility-lifetime product of this thin-film device is 6.6 × 10–7 cm2·V−1. This study allows us to extract the minority carrier decay length and to obtain the mobility-lifetime product which can be used to evaluate the performance of 2D carrier transport devices.Yu-Chien WeiCheng-Hao ChuMing-Hua MaoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Yu-Chien Wei Cheng-Hao Chu Ming-Hua Mao Minority carrier decay length extraction from scanning photocurrent profiles in two-dimensional carrier transport structures
description	Abstract Carrier transport was studied both numerically and experimentally using scanning photocurrent microscopy (SPCM) in two-dimensional (2D) transport structures, where the structure size in the third dimension is much smaller than the diffusion length and electrodes cover the whole terminal on both sides. Originally, one would expect that with increasing width in 2D transport structures, scanning photocurrent profiles will gradually deviate from those of the ideal one-dimensional (1D) transport structure. However, the scanning photocurrent simulation results surprisingly showed almost identical profiles from structures with different widths. In order to clarify this phenomenon, we observed the spatial distribution of carriers. The simulation results indicate that the integrated carrier distribution in the 2D transport structures with finite width can be well described by a simple-exponential-decay function with the carrier decay length as the fitting parameter, just like in the 1D transport structures. For ohmic-contact 2D transport structures, the feasibility of the fitting formula from our previous 1D analytical model was confirmed. On the other hand, the application of a simple-exponential-decay function in scanning photocurrent profiles for the diffusion length extraction in Schottky-contact 2D transport structures was also justified. Furthermore, our simulation results demonstrate that the scanning photocurrent profiles in the ohmic- or Schottky-contact three-dimensional (3D) transport structures with electrodes covering the whole terminal on both sides will reduce to those described by the corresponding 1D fitting formulae. Finally, experimental SPCM on a p-type InGaAs air-bridge two-terminal thin-film device was carried out. The measured photocurrent profiles can be well fitted by the specific fitting formula derived from our previous 1D analytical model and the extracted electron mobility-lifetime product of this thin-film device is 6.6 × 10–7 cm2·V−1. This study allows us to extract the minority carrier decay length and to obtain the mobility-lifetime product which can be used to evaluate the performance of 2D carrier transport devices.
format	article
author	Yu-Chien Wei Cheng-Hao Chu Ming-Hua Mao
author_facet	Yu-Chien Wei Cheng-Hao Chu Ming-Hua Mao
author_sort	Yu-Chien Wei
title	Minority carrier decay length extraction from scanning photocurrent profiles in two-dimensional carrier transport structures
title_short	Minority carrier decay length extraction from scanning photocurrent profiles in two-dimensional carrier transport structures
title_full	Minority carrier decay length extraction from scanning photocurrent profiles in two-dimensional carrier transport structures
title_fullStr	Minority carrier decay length extraction from scanning photocurrent profiles in two-dimensional carrier transport structures
title_full_unstemmed	Minority carrier decay length extraction from scanning photocurrent profiles in two-dimensional carrier transport structures
title_sort	minority carrier decay length extraction from scanning photocurrent profiles in two-dimensional carrier transport structures
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/c719d76389f94354be585e0b6619d2cc
work_keys_str_mv	AT yuchienwei minoritycarrierdecaylengthextractionfromscanningphotocurrentprofilesintwodimensionalcarriertransportstructures AT chenghaochu minoritycarrierdecaylengthextractionfromscanningphotocurrentprofilesintwodimensionalcarriertransportstructures AT minghuamao minoritycarrierdecaylengthextractionfromscanningphotocurrentprofilesintwodimensionalcarriertransportstructures
_version_	1718429254428917760

Minority carrier decay length extraction from scanning photocurrent profiles in two-dimensional carrier transport structures

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