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Enhanced Cu₂S/CdS coaxial nanowire solar cells by piezo-phototronic effect.

Authors
  • Pan, Caofeng
  • Niu, Simiao
  • Ding, Yong
  • Dong, Lin
  • Yu, Ruomeng
  • Liu, Ying
  • Zhu, Guang
  • Wang, Zhong Lin
Type
Published Article
Journal
Nano Letters
Publisher
American Chemical Society
Publication Date
Jun 13, 2012
Volume
12
Issue
6
Pages
3302–3307
Identifiers
DOI: 10.1021/nl3014082
PMID: 22642669
Source
Medline
License
Unknown

Abstract

Nanowire solar cells are promising candidates for powering nanosystems and flexible electronics. The strain in the nanowires, introduced during growth, device fabrication and/or application, is an important issue for piezoelectric semiconductor (like CdS, ZnO, and CdTe) based photovoltaic. In this work, we demonstrate the first largely enhanced performance of n-CdS/p-Cu(2)S coaxial nanowire photovoltaic (PV) devices using the piezo-phototronics effect when the PV device is subjected to an external strain. Piezo-phototronics effect could control the electron-hole pair generation, transport, separation, and/or recombination, thus enhanced the performance of the PV devices by as high as 70%. This effect offers a new concept for improving solar energy conversation efficiency by designing the orientation of the nanowires and the strain to be purposely introduced in the packaging of the solar cells. This study shed light on the enhanced flexible solar cells for applications in self-powered technology, environmental monitoring, and even defensive technology.

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