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- W4293918458 abstract "In this paper, high-performance self-assisted molecular beam epitaxy (MBE)-grown conventional core–shell (C–S) n-i-p GaAsSb nanowires (NWs) and a novel hybrid axial C–S n-i-p GaAsSb ensemble NW-based near-infrared photodetector (NIRPD) on nonpatterned Si substrate are demonstrated. The conventional room-temperature (RT) C–S n-i-p GaAsSb NW with a high responsivity of 190 A/W and a higher detectivity of 1.1 × 1014 Jones at −1 V bias and wavelength of 1.1 μm is reported by optimizing the intrinsic region thickness and appropriately compensating the intrinsic p-type behavior with n-dopant Te. Furthermore, hybrid axial C–S n-i-p GaAsSb has been band-gap-engineered for wavelength up to 1.5 μm, exhibiting responsivity of 18 A/W and detectivity of 1.1 × 1013 Jones operating at RT. In this hybrid design, we have combined both axial and radial intrinsic (i-) segments of different Sb% compositions to enhance the photoabsorption in the NIR region; hence, the photogenerated current and also the high-band-gap axial i-region help to suppress the trap-assisted tunneling mechanism, which is found to be advantageous over conventional C–S NW architectures. In addition, high rectification ratio from current–voltage (I–V) measurements, suppression of low-frequency noise, lack of 1/f noise, a low corner frequency of ∼2.5 Hz beyond which there is the presence of only frequency-independent white noise from low-frequency noise (LFN) measurements, and bias- and frequency-dependent capacitance–voltage (C–V) measurements suggest the formation of a high-quality C–S junction in the hybrid structure. Thus, our findings reveal that the hybrid axial C–S NW architecture provides the flexibility of three-dimensional (3D) design, which offers an unprecedented prospect for expanding IRPD and other next-generation optoelectronic device applications." @default.
- W4293918458 created "2022-09-01" @default.
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- W4293918458 date "2022-08-31" @default.
- W4293918458 modified "2023-09-27" @default.
- W4293918458 title "MBE-Grown Hybrid Axial Core–Shell n-i-p GaAsSb Heterojunction Ensemble Nanowire-Based Near-Infrared Photodetectors up to 1.5 μm" @default.
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- W4293918458 doi "https://doi.org/10.1021/acs.cgd.2c00652" @default.
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