Issue 8, 2017

Efficient photovoltaic devices based on p-ZnSe/n-CdS core–shell heterojunctions with high open-circuit voltage

Abstract

For solar cells, high open circuit voltage is necessary for their high output voltage. Usually, two methods are used to increase the open circuit voltage: using suitable and matched large band-gap materials and reduction of saturation current. Herein, large band-gap p-type ZnSe nanowires and n-type CdS films are used to construct core–shell p–n heterojunctions with high open circuit voltage. Furthermore, a 4 nm Si3N4 layer is inserted between the ZnSe core and the CdS shell in order to passivate the interface defects and to reduce recombination and the saturation current. Additionally, a fast annealing process is employed to reduce the series resistance for improved performance. For a typical device, an optimum high open circuit voltage of ∼1.3 V and an energy conversion efficiency of ∼5.27% were achieved for its photovoltaic operation. Moreover, tens of devices were fabricated to demonstrate their stable and consistent performance.

Graphical abstract: Efficient photovoltaic devices based on p-ZnSe/n-CdS core–shell heterojunctions with high open-circuit voltage

Supplementary files

Article information

Article type
Paper
Submitted
14 Nov 2016
Accepted
20 Jan 2017
First published
23 Jan 2017

J. Mater. Chem. C, 2017,5, 2107-2113

Efficient photovoltaic devices based on p-ZnSe/n-CdS core–shell heterojunctions with high open-circuit voltage

X. Zhang, J. Mao, Z. Shao, S. Diao, D. Hu, Z. Tang, H. Wu and J. Jie, J. Mater. Chem. C, 2017, 5, 2107 DOI: 10.1039/C6TC04960E

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