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Synthesis, structures and electroluminescence properties of CdS:In/Si nanoheterostructure array

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Abstract

An In-doped CdS/Si nanoheterojunction (CdS:In/Si-NPA) is prepared by depositing an In-doped CdS thin film onto a Si nanoporous pillar array (Si-NPA) via a successive ionic layer adsorption and reaction method. Based on the measured JV characteristic curve, the nanoheterojunction exhibits a good rectifying behavior with a low forward turn-on voltage (2.2 V), a small leakage current density (0.5 mA/cm2 at − 3 V) and a high reverse breakdown voltage (> 8 V). The electroluminescence (EL) measurements reveal that a broadband emerges between 400 and 700 nm, and this band is confirmed as a white light emission based on the value of the chromaticity coordinate. The EL properties, including the CIE chromaticity coordinates, Colour Rendering Index and correlated color temperature, can be tuned by the applied voltage. The generation mechanism of the EL can be well interpreted depending on the energy band structure of CdS:In/Si-NPA. The green band should be attributed to the band-edge emission of CdS and the yellow emission may be related to Cd interstitial. These results highlight the potential of CdS:In/Si-NPA as a light source for future white light emitting devices.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant No. 61705062 and 21601050), the Research Project for Basic and Forefront Technology of Henan Province (Grant No. 162300410219), The Excellent Youth Foundation of Henan Polytechnic University (Grant No. J2017-4), The Youth Backbone Teachers of Henan Polytechnic University (Grant No. QG2016-197), and the Henan Polytechnic University Foundation for Doctor Teachers (Grant No. B2016-46).

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Correspondence to Hong Xin Cai.

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Yan, L.L., Cai, H.X. & Chen, L. Synthesis, structures and electroluminescence properties of CdS:In/Si nanoheterostructure array. Appl. Phys. A 123, 658 (2017). https://doi.org/10.1007/s00339-017-1270-1

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