Phase‐Engineered Type‐II Multimetal–Selenide Heterostructures toward Low‐Power Consumption, Flexible, Transparent, and Wide‐Spectrum Photoresponse Photodetectors

Abstract

Phase-engineered type-II metal-selenide heterostructures are demonstrated by directly selenizing indium-tin oxide to form multimetal selenides in a single step. The utilization of a plasma system to assist the selenization facilitates a low-temperature process, which results in large-area films with high uniformity. Compared to single-metal-selenide-based photodetectors, the multimetal-selenide photodetectors exhibit obviously improved performance, which can be attributed to the Schottky contact at the interface for tuning the carrier transport, as well as the type-II heterostructure that is beneficial for the separation of the electron-hole pairs. The multimetal-selenide photodetectors exhibit a response to light over a broad spectrum from UV to visible light with a high responsivity of 0.8 A W and an on/off current ratio of up to 10 . Interestingly, all-transparent photodetectors are successfully produced in this work. Moreover, the possibility of fabricating devices on flexible substrates is also demonstrated with sustainable performance, high strain tolerance, and high durability during bending tests.

Two‐dimensional heterostructure promoted infrared photodetection devices

“…The effective spatial separation of carriers is forced due to the electrons and holes move to the opposite sides of the junction under a built‐in field . Moreover, by building semiconductor/semiconductor 2DHs with staggered gap type‐II and broken gap type‐III band alignments, a wide‐wavelength photodetection is expanded to the IR and even far infrared (FIR) region. In this section, issues about designing new semiconductor/semiconductor heterostructures, including homogeneous heterojunctions with type‐II and type‐III band alignment, are discussed.…”

Transition Metal Selenides for Electrocatalytic Hydrogen Evolution Reaction

“…Apart from application in electrocatalytic hydrogen production as excellent cathodic catalysts, TMSs are also utilized as catalysts of oxygen evolution reaction (OER), [139] oxygen reduction reaction (ORR). [140] Otherwise, attributed to TMSs' intriguing physicochemical properties, they have been applied in extensive fields, [141] e. g., photocatalysts, [142] electrochemical energy storage devices (ion batteries, supercapacitors), [143] dye-sensitized solar cells, [144] sensitivity glucose sensors, [145] photodetectors, [146] thermoelectric materials. [147]…”

Cocrystal Engineering: Toward Solution‐Processed Near‐Infrared 2D Organic Cocrystals for Broadband Photodetection

“…In the NIR region, it displays a high responsivity of 2424 mAW À1 at 800 nm, with detectivity of 3.77 10 11 Jones and EQE of 376 %, which performance is superior to other NIR photodetectors based on organic D-A photoactive layers (Supporting Information, Table S2). [35] Moreover, by comparison with other 2D organic and inorganic materials, [36] the ZCC film photodetector not only shows a wide spectra response, [37] but also achieving a high responsivity [38] and fast response times, [39] demonstrating the great potential of cocrystal materials for high-performance broadband photodetectors.…”