Electrical characteristics and photodetection mechanism of TiO<sub>2</sub>/AlGaN/GaN heterostructure-based ultraviolet detectors with a Schottky junction

Zhan, Teng; Sun, Jianwen; Feng, Tao; Zhou, Binru; Zhang, Banghong; Wang, Junxi; Sarro, P.M.; Zhang, Guoqi; Liu, Zewen; Yi, Xiaoyan; Li, Jinmin

doi:10.1039/d2tc04491a

Cited by 5 publications

(1 citation statement)

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“…Several materials, such as GaN, ZnO, Cr 2 O 3 , and TiO 2 , have been utilized as base material for photodetector applications. This is due to their unique characteristics, i.e., wide-band-gap value [8]. In particular, chromia oxide (Cr 2 O 3 ) attracted a lot of interest [9] as a wide-band-gap material (E g ~3 eV).…”

Section: Introductionmentioning

confidence: 99%

Porous-Spherical Cr2O3-Cr(OH)3-Polypyrrole/Polypyrrole Nanocomposite Thin-Film Photodetector and Solar Cell Applications

et al. 2023

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This study utilized the exceptional optical and electrical properties of polypyrrole (Ppy) to fabricate high-performance optoelectronic devices. The synthesis of the porous-spherical Cr2O3-Cr(OH)3-Ppy/Ppy nanocomposite thin film was achieved by preparing a second thin film of Cr2O3-Cr(OH)3-Ppy on the initial Ppy film using K2Cr2O7 as an oxidant. The nanocomposite’s properties were thoroughly characterized, including XRD and optical absorbance analyses. The XRD analysis showed that the crystalline size of the nanocomposite was 20 nm, while optical absorbance analysis demonstrated that the nanocomposite had a higher absorbance in a wide optical range compared to Ppy nanomaterials, as evidenced by the enhancement in bandgap (Eg) value from 3.33 eV for Ppy to 1.89 eV for Cr2O3-Cr(OH)3-Ppy. The fabricated nanocomposite thin film exhibited excellent light-sensing behavior, as evidenced by the evaluation of Jph values under different light conditions and various monochromatic lights with a detectivity (D) of 3.6 × 106 Jones (at 340 nm). The device demonstrated its potential as a solar cell, with a short circuit current (JSC) of 13 µA and an open circuit voltage (VOC) of 1.91 V. Given the nanocomposite’s low cost, high technical production, and superior optoelectronic properties, it has significant potential for use in commercially available high-tech devices.

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Section: Introductionmentioning

confidence: 99%

Porous-Spherical Cr2O3-Cr(OH)3-Polypyrrole/Polypyrrole Nanocomposite Thin-Film Photodetector and Solar Cell Applications

et al. 2023

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Ultraviolet–Visible Photodetector Driven by Local Electrostatic Field from Chargeable Electret

Hao

et al. 2023

Advanced Optical Materials

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Metal oxide semiconductors have been developed for ultraviolet–visible photodetectors, but improving sensitivity has remained a challenge due to poor mobility and carrier losses. In this study, a high‐performance photodetector is achieved by implementing a chargeable electret to regulate carrier transmission properties in the CuBi2O4 (CBO) conductive channel. As expected, the positively charged device shows improved performance, with a broadband detection range covering 250–600 nm, maximum responsivity and detectivity of around 10.65 A W−1 and 8.56 × 1012 Jones, and a fast rise and decay time of 50 and 300 µs, respectively. Mechanism analyses suggest two roles of the electret layer: 1) positive charges in the electret layer attract electrons and leave a pure hole conductive channel with less carrier recombination and trapping; 2) holes in the conductive channel move in one direction with less carrier collision and scattering. This work has demonstrated an effective strategy for providing a durable and stable ultra‐high electrostatic field to improve the sensitivity of photodetectors.

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Ultraviolet photodetectors based on wide bandgap semiconductor: a review

Ding,

Zhao,

Chen

et al. 2024

Appl. Phys. A

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Electrical characteristics and photodetection mechanism of TiO₂/AlGaN/GaN heterostructure-based ultraviolet detectors with a Schottky junction

Abstract: The recent research focus on wide-bandgap and two-dimensional materials with a Schottky junction has provided a new concept for ultraviolet photodetectors. However, the working mechanism of the Schottky junction-based detector...

Cited by 5 publications

References 50 publications

Porous-Spherical Cr2O3-Cr(OH)3-Polypyrrole/Polypyrrole Nanocomposite Thin-Film Photodetector and Solar Cell Applications

Porous-Spherical Cr2O3-Cr(OH)3-Polypyrrole/Polypyrrole Nanocomposite Thin-Film Photodetector and Solar Cell Applications

Ultraviolet–Visible Photodetector Driven by Local Electrostatic Field from Chargeable Electret

Ultraviolet photodetectors based on wide bandgap semiconductor: a review

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Electrical characteristics and photodetection mechanism of TiO2/AlGaN/GaN heterostructure-based ultraviolet detectors with a Schottky junction

Abstract: The recent research focus on wide-bandgap and two-dimensional materials with a Schottky junction has provided a new concept for ultraviolet photodetectors. However, the working mechanism of the Schottky junction-based detector...

Cited by 5 publications

References 50 publications

Porous-Spherical Cr2O3-Cr(OH)3-Polypyrrole/Polypyrrole Nanocomposite Thin-Film Photodetector and Solar Cell Applications

Porous-Spherical Cr2O3-Cr(OH)3-Polypyrrole/Polypyrrole Nanocomposite Thin-Film Photodetector and Solar Cell Applications

Ultraviolet–Visible Photodetector Driven by Local Electrostatic Field from Chargeable Electret

Ultraviolet photodetectors based on wide bandgap semiconductor: a review

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Electrical characteristics and photodetection mechanism of TiO₂/AlGaN/GaN heterostructure-based ultraviolet detectors with a Schottky junction