Strong photo-response in a flip-chip nanowire p-Cu2O/n-ZnO junction

Abstract

Cu(2)O nanoneedles are synthesized on a copper substrate by a simple anodization and reducing ambient annealing protocol. ZnO nanorods are grown on ITO coated glass by a low temperature chemical route. The electronic and photo-response properties of the p-Cu(2)O/n-ZnO flip-chip heterojunction are then studied and analyzed. We show that the I-V characteristic is rectifying and the junction exhibits a good photoresponse (∼120% under 1 V reverse bias) under AM 1.5 (1 Sun) illumination. This nano-heterojunction photo-response is far stronger as compared to that of a pulsed laser deposited thin film p-Cu(2)O/n-ZnO heterojunction, which can be attributed to higher junction area in the former case.

A high-performance UV/visible photodetector of Cu2O/ZnO hybrid nanofilms on SWNT-based flexible conducting substrates

“…Fig. 4,8,10,28,29 Furthermore, a comparison experiment was carried out via switching ZnO and Cu 2 O deposition order on SWNT-based PET. It can be seen that the photoresponsivity, dened as the ratio of the current under the illumination to that under the dark, can reach 520, which is a signicant increase of 3000% compared to the result presented in a recent report.…”

“…However, it requires synthesizing at high temperature, complicated process control, and rigorous conditions. 20 A few studies of the ZnO/Cu 2 O heterojunction have been reported for photovoltaic, 17 photocatalytic, 20,27 and photosensitive 28,29 applications. It is one of the most studied metal oxides for solar cells, [17][18][19] photocatalysts, 20,21 photosensors, 22,23 and photoelectrochemical (PEC) applications, [24][25][26] because of its high optical absorption coefficient, nontoxicity, abundant availability and low production cost.…”

Electronic Structure Engineering of Cu2O Film/ZnO Nanorods Array All-Oxide p-n Heterostructure for Enhanced Photoelectrochemical Property and Self-powered Biosensing Application

“…The property of semiconductor heterostructure dominates the behavior of photoinduced charge carrier, which finally determines the photoelectrochemical response. As is known, a variety of Cu 2 O/ZnO p-n junctions have been applied for enhanced photocatalytic performance and efficient photovoltaic cells due to their controllable electronic structure at interface and good energy band alignment 8 9 10 11 12 13 14 15 16 17 18 19 . ZnO nanomaterials have been extensively studied because of their rather rich morphology world, large excitation binding energy (60 meV), deep level defects and high electron mobility 20 21 22 23 .…”

Photoelectrochemical study of carbon-modified p-type Cu2O nanoneedles and n-type TiO2−x nanorods for Z-scheme solar water splitting in a tandem cell configuration

“…To further conrm the charge transfer and performance of the proposed tandem PEC cell, a ip-chip method (Fig. 8A) 73 was used in the absence of any sacricial redox species such as water. A light-activated heterojunction diode between C/Cu 2 O NNs and TiO 2Àx NRs can be established with a low turn-on voltage around 0.15 V when these nanostructured electrodes are in intimate contact.…”