Near-infrared photodetection and time-resolved photocurrents in cadmium arsenide heterojunctions.
Opt Lett
; 49(17): 4883-4886, 2024 Sep 01.
Article
em En
| MEDLINE
| ID: mdl-39207988
ABSTRACT
Dirac and Weyl semimetals, such as cadmium arsenide (Cd3As2), have recently attracted attention for use in high-speed photodetectors that operate at longer infrared wavelengths, where conventional semiconductor-based photodetectors have a limited performance. In this Letter, we explore near-infrared (960â
nm) photodetection in a Cd3As2/AlSb heterojunction. We show that Cd3As2/AlSb heterojunctions allow for an unbiased operation and demonstrate an enhanced responsivity and quantum efficiency compared to AlSb and Cd3As2 reference devices. To characterize their high-speed response, the photocurrent dynamics of the heterojunctions were also explored via time-resolved photocurrent (TRPC) measurements, revealing a photocurrent process occurring over 200-500â
ps in the Cd3As2/AlSb heterojunctions that is not observed in the AlSb and Cd3As2 reference devices. This time is attributed to the recombination rate of carriers in the heterojunction.
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01-internacional
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MEDLINE
Idioma:
En
Ano de publicação:
2024
Tipo de documento:
Article