The improved photoresponse properties of self-powered NiO/ZnO heterojunction arrays UV photodetectors with designed tunable Fermi level of ZnO

Copyright © 2020 Elsevier Inc. All rights reserved..

Self-powered ultraviolet (UV) photodetectors (PDs) based on ZnO heterojunctions have attracted more attention due to the simple preparation and excellent photoresponse performance without any power supply. The self-powered UV PDs based on NiO nanoflakes/ZnO nanorod arrays (NRs) heterojunctions were fabricated by a low-cost, simple chemical bath deposition (CBD) method. The crystal quality, optical and electronic properties of ZnO NRs is modified by Al3+ ions additions in the precursor solution. The heterojunction devices with ZnO NRs grown in 0.5% Al3+ ions additions precursor solution exhibit a narrow UV spectral selectivity, high photoresponsivity R (85.12 mA/W) and detectivity D* (1.74 × 1012 cm·Hz1/2/W) and a fast response speed (~2 ms) under 378 nm UV light for low intensity irradiance (0.2 mW/cm2) at zero bias. The large built-in electric field of the NiO/ZnO heterojunction with the increased Fermi level of ZnO NRs provide a strong driving force to separate and transfer the photo-generated carriers, decrease the recombination of the carriers and then improve the photoresponse performance of heterojunction devices without external bias.

Medienart:

E-Artikel

Erscheinungsjahr:

2020

Erschienen:

2020

Enthalten in:

Zur Gesamtaufnahme - volume:577

Enthalten in:

Journal of colloid and interface science - 577(2020) vom: 01. Okt., Seite 279-289

Sprache:

Englisch

Beteiligte Personen:

Wei, Chengtai [VerfasserIn]
Xu, Jianping [VerfasserIn]
Shi, Shaobo [VerfasserIn]
Bu, Yichen [VerfasserIn]
Cao, Rui [VerfasserIn]
Chen, Jing [VerfasserIn]
Xiang, Jinjie [VerfasserIn]
Zhang, Xiaosong [VerfasserIn]
Li, Lan [VerfasserIn]

Links:

Volltext

Themen:

Fermi level
Heterojunctions
Journal Article
Self-powered photodetectors
Surface defect states

Anmerkungen:

Date Revised 03.08.2020

published: Print-Electronic

Citation Status PubMed-not-MEDLINE

doi:

10.1016/j.jcis.2020.05.077

funding:

Förderinstitution / Projekttitel:

PPN (Katalog-ID):

NLM310656680