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Universal Electrochemical Synthesis of Mesoporous Chalcogenide Semiconductors: Mesoporous CdSe and CdTe Thin Films for Optoelectronic Applications
Author(s) -
Nagaura Tomota,
Phan HoangPhuong,
Malgras Victor,
Pham TuanAnh,
Lim Hyunsoo,
Ashok Aditya,
Kim Jeonghun,
You Jungmok,
Nguyen NamTrung,
Na Jongbeom,
Yamauchi Yusuke
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202013541
Subject(s) - mesoporous material , materials science , chalcogenide , semiconductor , cadmium telluride photovoltaics , thin film , optoelectronics , nanotechnology , visible spectrum , photodetector , chemistry , organic chemistry , catalysis
Abstract Here we report the soft‐template‐assisted electrochemical deposition of mesoporous semiconductors (CdSe and CdTe). The resulting mesoporous films are stoichiometrically equivalent and contain mesopores homogeneously distributed over the entire surface. To demonstrate the versatility of the method, two block copolymers with different molecular weights are used, yielding films with pores of either 9 or 18 nm diameter. As a proof of concept, the mesoporous CdSe film‐based photodetectors show a high sensitivity of 204 mW −1 cm 2 at 680 nm wavelength, which is at least two orders of magnitude more sensitive than the bulk counterpart. This work presents a new synthesis route for nanostructured semiconductors with optical band gaps active in the visible spectrum.