The enhancement of a self-powered UV photodetector based on vertically aligned Ag-modified ZnO nanowires

Abstract

A self-powered photoelectrochemical cell-type UV detector has been fabricated using Ag nanoparticle-modified ZnO NWs as an active photoanode and H 2 O as the electrolyte. The fabricated device shows a high responsivity (0.37 A W À1 ). The enhancement is attributed to the modification of the structure which enables more effective separation and directional transfer.

Synthesis of SnO2 Nanowires Using SnI2 as Precursor and Their Application as High‐Performance Self‐Powered Ultraviolet Photodetectors

“…It can be seen from Table that most photodetectors with high value of EQE and R λ are measured at bias from 1 to 20 V . The devices fabricated from SnO 2 nanowires, ZnO‐Nanorod/CuSCN, TiO 2 nanorod arrays and Ag‐ZnO nanowires measured at nominal zero bias show low values of EQE and R λ . However, the individual SnO 2 nanowire‐based photodetectors D1 and D2 in the present work show both high performances and self‐powered properties.…”

A high performance ZnO based photoelectrochemical cell type UV photodetector with [Co(bpy)3]3+/2+ electrolyte and PEDOT/ITO counter electrode

“…The device with PEDOT/ITO CE shows a highest photosensitivity of 263, which is considerably higher than the values of the devices with Pt/ ITO CE (17) and ITO CE (2.3). The parameters of ZnO based PECC type UV photodetectors reported in other literatures 16,25,26 are also collected in Table 1. It is seen that our device with PEDOT/ITO CE displays the highest photosensitivity, while the other parameters such as I ph , (s r ) and (s d ) are comparable.…”

“…12,13 Currently, TiO 2 and ZnO are the most frequently used photoanode materials for the PECC type UV photodetectors. [14][15][16] The band structure of ZnO is similar to that of TiO 2 , but ZnO has a higher electron mobility compared with TiO 2 . 17 What's more, ZnO can be prepared in various morphologies, such as nanorods, nanoneedles and nanobelts, by simple and cost-effective techniques.…”

High-performance of self-powered UV photodetector with long-term stability based on ZnO nanorods and an iodine-free quasi solid-state electrolyte

“…More precisely, the photocurrent is 1.4 Â 10 À4 A, which is much larger than the dark current of which were considerably higher than the corresponding values recently reported by other groups. 36,37 As is already known, the solvent in the liquid electrolyte volatilize easily and thus, it is hard to seal it in the photodetector, which hinders its practical use in the UV photodetector. In this research, PEO is used to solidify the liquid electrolyte to obtain the quasi solid-state electrolyte, avoiding the disadvantage with sealing it in the photodetector.…”

“…In this research, the ZnO NRs were synthesized using a simple hydrothermal method. 29,30 Then, an iodine-free quasi solid-state electrolyte containing potassium iodide (KI), poly(ethylene oxide) (PEO) and 1-methyl-3-propylimidazolium iodide (PMII), was prepared and then assembled with ZnO NRs to fabricate a high efficiency self-powered PECC type UV photodetector. This photodetector has a large photocurrent, fast photoresponse speed, high responsivity, high sensitivity and great stability.…”