Universal Electrochemical Synthesis of Mesoporous Chalcogenide Semiconductors: Mesoporous CdSe and CdTe Thin Films for Optoelectronic Applications

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Nagaura, Tomota
Phan, Hoang-Phuong
Malgras, Victor
Pham, Tuan-Anh
Lim, Hyunsoo
Ashok, Aditya
Kim, Jeonghun
You, Jungmok
Nguyen, Nam-Trung
Na, Jongbeom
Yamauchi, Yusuke
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2020
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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 were 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 pioneers a new synthesis route for nanostructured semiconductors with optical band gaps active in the visible spectrum.

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Angewandte Chemie - International Edition

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© 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. This is the peer reviewed version of the following article: Universal Electrochemical Synthesis of Mesoporous Chalcogenide Semiconductors: Mesoporous CdSe and CdTe Thin Films for Optoelectronic Applications, Angewandte Chemie, International Edition, 2020, which has been published in final form at https://doi.org/10.1002/anie.202013541. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving (http://olabout.wiley.com/WileyCDA/Section/id-828039.html)

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Chemical sciences

Self-assembly

block copolymers

electrochemical deposition

mesoporous semiconductors

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Nagaura, T; Phan, H-P; Malgras, V; Pham, T-A; Lim, H; Ashok, A; Kim, J; You, J; Nguyen, N-T; Na, J; Yamauchi, Y, Universal Electrochemical Synthesis of Mesoporous Chalcogenide Semiconductors: Mesoporous CdSe and CdTe Thin Films for Optoelectronic Applications, Angewandte Chemie - International Edition, 2020

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