Photoresponse of Carbon Nanofiber-Based Photodetector and Its Enhancement on CuNi Nanoparticle Adsorption.
ACS Omega
; 9(25): 27232-27247, 2024 Jun 25.
Article
in En
| MEDLINE
| ID: mdl-38947801
ABSTRACT
We explore the photodetection properties of a carbon nanofiber (CNF)-based p-CNF/n-Si heterojunction device in the 400-800 nm wavelength range and investigate the changes brought in by adsorption of CuNi (CN) nanoparticles on the CNFs. The nanoparticles and CN-CNF nanocomposites were synthesized by using chemical hydrothermal routes. The p-type semiconducting nature of the CNFs and nanocomposites was determined using X-ray photoelectron (XPS) and UV-vis spectroscopies. The p-CNF/n-Si device is found to be better than many carbon-nanotube-based devices in terms of its peak responsivity (0.6 A/W) and gain (1.6), with an acceptably moderate peak detectivity (1.3 × 109 Jones) at 450 nm and a -5 V bias. The p-CN-CNF/n-Si device displays an appreciable enhancement in the photoresponse with respect to the p-CNF/n-Si device, with a peak responsivity of 2.8 A/W, peak detectivity of 9.4 × 109 Jones, and gain of 8. With the aid of valence band XPS and Raman spectra, the enhancement is explainable in terms of a CN to CNF charge transfer and the resulting increase in the built-in potential at the heterojunction.
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01-internacional
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MEDLINE
Language:
En
Journal:
ACS Omega
Year:
2024
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Article
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