Enhanced performances of flexible ZnO/perovskite solar cells by piezo-phototronic effect. (May 2016)

• Record Type: Journal Article
• Authors: Hu, Guofeng; Guo, Wenxi; Yu, Ruomeng; Yang, Xiaonian; Zhou, Ranran; Pan, Caofeng; Wang, Zhong Lin
• Is Part Of: Nano energy. Volume 23(2016:May)
• Page Start: 27
• Page End: 33
• Publication Date: 2016-05
• Subjects: Perovskite solar cells -- ZnO microwire -- Piezo-phototronic effect; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2016.02.057
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: In this work, piezoelectric ZnO microwire was utilized to form heterojunctions with perovskite as flexible photovoltaic devices, and has a power conversion efficiency of 0.0216%. By employing the piezo-phototronic effect, the strain-induced piezoelectric polarization charges at the vicinity of ZnO/perovskite interface can modulate the transport and separation processes of photo-generated carriers within the photovoltaic device and enhance the performances of ZnO/perovskite solar cells. The corresponding open-circuit voltage ( V oc ), short-circuit current ( I sc ) and efficiency of the solar cells were improved by 25.42%, 629.47% and 1280% (from 0.0216% to 0.298%) through piezo-phototronic effect, respectively. Physical working mechanism behind the observed results was carefully investigated by using energy band diagram. This study provides a promising approach to effectively enhance the overall performances of flexible solar cells for various applications. Graphical abstract: In this work, ZnO microwire was utilized to form heterojunctions with perovskite as flexible photovoltaic devices. The open-circuit voltage ( Voc ), short-circuit current ( Isc ) and efficiency of the flexible ZnO/perovskite solar cell were improved by 25.42%, 629.47% and 1280% (from 0.0216% to 0.298%) through piezo-phototronic effect, respectively. Highlights: ZnO/perovskite solar cells (ZPSC) were fabricated by employing single ZnO microwire (MW) as the electron transporter on a flexible substrate The piezo-phototronic effect was investigated on these ZPSCs by introducing externally strains to the devices. The effect of the polarity of the ZnO MW on the piezo-phototronic effect was first time experimentally proved.