Enhanced absorptive characteristics of GaN nanowires for ultraviolet (UV) photocathode

Lv, Zhisheng; Liu, Lei; Zhangyang, Xingyue; Lu, Feifei

doi:10.1007/s00339-020-3312-3

Cited by 13 publications

(12 citation statements)

References 15 publications

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“…It uses a finite number of simple and small cells to infinitely approximate an unknown quantity of the real system. In this work, we use COMSOL Multiphysics [ 46,47 ] to simulate two rectangular Cs 3 Bi 2 I 9 and p‐Si devices, where the optical parameters of the perovskite Cs 3 Bi 2 I 9 nanocrystals are referenced from literature. [ 48–50 ] In the model for Cs 3 Bi 2 I 9 , we first performed a scan at wavelengths from 200 to 500 nm via keeping the incident light power constant.…”

Section: Resultsmentioning

confidence: 99%

Air‐Stabilized Lead‐Free Hexagonal Cs₃Bi₂I₉ Nanocrystals for Ultrahigh‐Performance Optical Detection

Wang

Liu

et al. 2022

Adv Funct Materials

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Broadband photodetectors possess enormous potentials for diverse applications while it is generally subjected to a lack of active materials with high performances under user-friendly conditions. Bismuth-based perovskites are promising and demonstrate better air stability than lead halide perovskites against moisture, heat, and light. In the present work, lead-free all-inorganic hexagonal Cs 3 Bi 2 I 9 perovskite nanocrystals are successfully fabricated via a modulated colloidal synthetic route. The Cs 3 Bi 2 I 9 nanocrystals are monodispersed with a size of ≈28 nm, which are applied for the construction of flexible Cs 3 Bi 2 I 9 detector and vertical heterogeneous structured photo detector of p-Si/Cs 3 Bi 2 I 9 /graphene. The flexible detector not only demonstrates excellent detective performance, but also yields high-resolution photographs as an imaging sensor. The p-Si/Cs 3 Bi 2 I 9 /graphene photodetector exhibits broad spectral response from ultraviolet to infrared light (254−1064 nm) with microsecond response time (31/34 µs). In particular, it performs with a high responsivity of 23.6 A W −1 and a high specific detectivity of 1.75 × 10 13 Jones under 650 nm illumination even in weak light intensity as low as 1 µW cm −2 , and exhibits excellent stability in ambient air, which is obviously ahead of the previously reported work. In addition, finite element analysis further demonstrates the excellent optoelectronic properties of Cs 3 Bi 2 I 9 materials and the broad spectral response of vertical heterojunctions.

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Section: Resultsmentioning

confidence: 99%

Air‐Stabilized Lead‐Free Hexagonal Cs₃Bi₂I₉ Nanocrystals for Ultrahigh‐Performance Optical Detection

Wang

Liu

et al. 2022

Adv Funct Materials

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“…Moreover, optoelectronic and physicochemical features of nanomaterials have a close correlation with the crystal structures, the confined dimension, the morphology of cross section, and the size of nanostructures. [1][2][3][4] To understand how these factors influence their properties and to explore nanomaterials with potential device applications, it is technically important to fabricate nanostructures with controllable geometries and analyze their various features in theories. Among various nanostructures with different morphologies of the cross section, the quantum rings (QRs) have attracted a lot of attention because of their unique geometry and importance for study of the Aharonov-Bohm effect [5] and persistent currents.…”

Section: Introductionmentioning

confidence: 99%

Dispersive Spectra of Phonon Modes and Fröhlich Electron–Phonon Coupling Properties in AlGaN Quantum Rings: Wurzite versus Zinc‐Blende Structure

Zhang

Shao

Pang³

2022

Physica Status Solidi (b)

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The influence of crystal structure on the phonon modes and electron–phonon coupling properties in nitride quantum ring (QR) structures is investigated based on the macroscopic dielectric continuum model. It is found that three types of phonon modes including the surface optical (SO) phonon modes, the exact confined (EC) modes, and quasiconfined (QC) modes can coexist in the wurtzite nitride QR. However, only the SO modes and EC modes may appear in zinc‐blende nitride QR, and the QC modes cannot exist in zinc‐blende QRs in general. Numerical calculation on AlN QR shows that the SO modes of zinc‐blende QR are more dispersive than those of wurtzite QR. Furthermore, the degenerative behavior of QC modes to SO modes in wurtzite QRs is clearly observed. Moreover, the electron–phonon coupling functions in zinc‐blende QRs are larger than those in wurtzite QRs. These results reveal that the crystal structures greatly affect not only the type of phonon mode, but also the coupling strength of electron–phonon interaction. The present theoretical scheme and the numerical results are quite useful and important for further understanding and investigating the polaronic effect and related physical properties in wurtzite and zinc‐blende nitride QRs.

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“…[6][7][8] As well as the increasing human interest in exploring outer space and the scientific research needs of ocean monitoring, ultraviolet detectors have become a hot spot in recent years. [9][10][11][12] At the same time, the rapid development of nanotechnology has brought new vitality to many traditional industries. At the nanoscale, materials will exhibit relatively different physical properties, which makes nanoscale optoelectronic devices have a great space for development.…”

Section: Introdutionmentioning

confidence: 99%

“…And infrared detectors used for auxiliary medical treatment, security monitoring, and biological testing 6‐8 . As well as the increasing human interest in exploring outer space and the scientific research needs of ocean monitoring, ultraviolet detectors have become a hot spot in recent years 9‐12 . At the same time, the rapid development of nanotechnology has brought new vitality to many traditional industries.…”

Section: Introdutionmentioning

confidence: 99%

Theoretical study on2Dphotoelectric emission ofGaNnanorod array and nanocone array photocathode

Zhang

Liu

et al. 2020

Int J Energy Res

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Summary In order to improve the photoemission performance of gallium nitride (GaN) ultraviolet vacuum photoelectric devices and to obtain GaN photocathode with high quantum efficiency in this paper. The photoelectric emission theoretical models of GaN nanorod array and GaN nanocone array are constructed, and the models are simulated by COMSOL Multiphysics and MATLAB software. By changing the structure of the photocathode emission layer, the low photoemission performance of the conventional reflection‐mode thin‐film photocathode can be improved. After calculating and analyzing the influence of the geometric parameters of the nanorod array on its quantum efficiency (QE), it is found that the nanorod array has the best diameter and spacing to maximize its QE, and the nanocone array can also achieve high QE under some conditions. In addition, the high QE GaN nanorod array and nanocone array structures obtained in this article can provide some references for the production and manufacture of high‐performance GaN photocathode.

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Enhanced absorptive characteristics of GaN nanowires for ultraviolet (UV) photocathode

Cited by 13 publications

References 15 publications

Air‐Stabilized Lead‐Free Hexagonal Cs₃Bi₂I₉ Nanocrystals for Ultrahigh‐Performance Optical Detection

Air‐Stabilized Lead‐Free Hexagonal Cs₃Bi₂I₉ Nanocrystals for Ultrahigh‐Performance Optical Detection

Dispersive Spectra of Phonon Modes and Fröhlich Electron–Phonon Coupling Properties in AlGaN Quantum Rings: Wurzite versus Zinc‐Blende Structure

Theoretical study on2Dphotoelectric emission ofGaNnanorod array and nanocone array photocathode

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Enhanced absorptive characteristics of GaN nanowires for ultraviolet (UV) photocathode

Cited by 13 publications

References 15 publications

Air‐Stabilized Lead‐Free Hexagonal Cs3Bi2I9 Nanocrystals for Ultrahigh‐Performance Optical Detection

Air‐Stabilized Lead‐Free Hexagonal Cs3Bi2I9 Nanocrystals for Ultrahigh‐Performance Optical Detection

Dispersive Spectra of Phonon Modes and Fröhlich Electron–Phonon Coupling Properties in AlGaN Quantum Rings: Wurzite versus Zinc‐Blende Structure

Theoretical study on2Dphotoelectric emission ofGaNnanorod array and nanocone array photocathode

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Air‐Stabilized Lead‐Free Hexagonal Cs₃Bi₂I₉ Nanocrystals for Ultrahigh‐Performance Optical Detection

Air‐Stabilized Lead‐Free Hexagonal Cs₃Bi₂I₉ Nanocrystals for Ultrahigh‐Performance Optical Detection