CdS/Si nanofilm heterojunctions based on amorphous silicon films: Fabrication, structures, and electrical properties

doi:10.1088/1674-1056/abc15e

Abstract Shortening the distance between the depletion region and the electrodes to reduce the trapped probability of carriers is a useful approach for improving the performance of heterojunction. The CdS/Si nanofilm heterojunctions are fabricated by using the radio frequency magnetron sputtering method to deposit the amorphous silicon nanofilms and CdS nanofilms on the ITO glass in turn. The relation of current density to applied voltage (I-V) shows the obvious rectification effect. From the analysis of the double logarithm I-V curve it follows that below ∼ 2.73 V the electron behaviors obey the Ohmic mechanism and above ∼ 2.73 V the electron behaviors conform to the space charge limited current (SCLC) mechanism. In the SCLC region part of the traps between the Fermi level and conduction band are occupied, and with the increase of voltage most of the traps are occupied. It is believed that CdS/Si nanofilm heterojunction is a potential candidate in the field of nano electronic and optoelectronic devices by optimizing its fabricating procedure.

Keywords: magnetron sputtering CdS/Si nanofilm heterojunctions electron behaviors SCLC mechanisms

Received: 18 August 2020
Revised: 16 September 2020
Accepted manuscript online: 15 October 2020

PACS:	61.72.uj	(III-V and II-VI semiconductors)
	71.20.Nr	(Semiconductor compounds)
	73.61.-r	(Electrical properties of specific thin films)
	73.40.Lq	(Other semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions)

Fund: Project supported by the Natural Science Foundation of Henan Province，China (Grant No. 202300410304) and the Key Research Project for Science and Technology of the Education Department of Henan Province, China (Grant No. 21A140021).

Corresponding Authors: ^†Corresponding author. E-mail: liyong@pdsu.edu.cn, kmly0126@163.com

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Yong Li(李勇), Peng-Fei Ji(姬鹏飞), Yue-Li Song(宋月丽), Feng-Qun Zhou(周丰群), Hong-Chun Huang(黄宏春), and Shu-Qing Yuan(袁书卿) CdS/Si nanofilm heterojunctions based on amorphous silicon films: Fabrication, structures, and electrical properties 2021 Chin. Phys. B 30 026101

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CdS/Si nanofilm heterojunctions based on amorphous silicon films: Fabrication, structures, and electrical properties

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