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Ferroelectrically Modulated and Enhanced Photoresponse in a Self-Powered α-In 2 Se 3 /Si Heterojunction Photodetector.
- Source :
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ACS nano [ACS Nano] 2023 Apr 11; Vol. 17 (7), pp. 6534-6544. Date of Electronic Publication: 2023 Mar 23. - Publication Year :
- 2023
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Abstract
- Photodetectors have been applied to pivotal optoelectronic components of modern optical communication, sensing, and imaging systems. As a room-temperature ferroelectric van der Waals semiconductor, 2D α-In <subscript>2</subscript> Se <subscript>3</subscript> is a promising candidate for a next-generation optoelectronic material because of its thickness-dependent direct bandgap and excellent optoelectronic performance. Previous studies of photodetectors based on α-In <subscript>2</subscript> Se <subscript>3</subscript> have been rarely focused on the modulated relationship between the α-In <subscript>2</subscript> Se <subscript>3</subscript> intrinsic ferroelectricity and photoresponsivity. Herein, a simple integrated process and high-performance photodetector based on an α-In <subscript>2</subscript> Se <subscript>3</subscript> /Si vertical hybrid-dimensional heterojunction was constructed. Our photodetector in the ferroelectric polarization up state accomplishes a self-powered, highly sensitive photoresponse with an on/off ratio of 4.5 × 10 <superscript>5</superscript> and detectivity of 1.6 × 10 <superscript>13</superscript> Jones, and it also shows a fast response time with 43 μs. The depolarization field generated by the remanent polarization of ferroelectrics in α-In <subscript>2</subscript> Se <subscript>3</subscript> provides a strategy for enhancement and modulation of photodetection. The negative correlation was discovered because the enhancement photoresponsivity factor of ferroelectric modulation competes with the photovoltaic behavior within the α-In <subscript>2</subscript> Se <subscript>3</subscript> /Si heterojunction. Our research highlights the great potential of the high-efficiency heterojunction photodetector for future object recognition and photoelectric imaging.
Details
- Language :
- English
- ISSN :
- 1936-086X
- Volume :
- 17
- Issue :
- 7
- Database :
- MEDLINE
- Journal :
- ACS nano
- Publication Type :
- Academic Journal
- Accession number :
- 36952315
- Full Text :
- https://doi.org/10.1021/acsnano.2c11925