Piezostrain-enhanced photovoltaic effects in BiFeO3/La0.7Sr0.3MnO3/PMN–PT heterostructures. (November 2015)

• Record Type: Journal Article
• Authors: Zhang, Wei; Yang, Ming-Min; Liang, Xiao; Zheng, Hai-Wu; Wang, Yu; Gao, Wen-Xiu; Yuan, Guo-Liang; Zhang, Wei-Feng; Li, Xiao-Guang; Luo, Hao-Su; Zheng, Ren-Kui
• Is Part Of: Nano energy. Volume 18(2015:Nov.)
• Page Start: 315
• Page End: 324
• Publication Date: 2015-11
• Subjects: Photovoltaic effect -- Piezoelectric strain -- BiFeO3 film -- PMN–PT single crystal; 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.2015.10.013
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: BiFeO3 (BFO) is a unique multiferroic material that shows interesting but rather weak photovoltaic effect. Here, we report the integration of Pt/BFO/La0.7 Sr0.3 MnO3 (LSMO) photovoltaic devices on piezoelectric 0.71Pb(Mg1/3 Nb2/3 )O3 –0.29PbTiO3 (PMN–PT) single-crystal substrates and realized a piezo-photovoltaic effects in the BFO/LSMO/PMN–PT heterostructures through in situ dynamical strain engineering. Upon the application of an electric field of +10 kV/cm, an in-plane compressive strain was induced in the PMN–PT via the converse piezoelectric effect, which was effectively transferred to the BFO film through the LSMO, leading to a change in the in-plane strain and bandgap of the BFO film by ~0.12% and ~22 meV, respectively. As a result, the power conversion coefficiency (PCE) η was dramatically enhanced by ~218%, corresponding to a gauge factor (Δ η / η )/ δεxx ~1817. The results demonstrate that the dynamic strain engineering of photovoltaic properties using the converse piezoelectric effect is an effective and unique approach for realizing enhanced PCE of ferroelectric thin film-based photovoltaic devices. Graphical abstract: Highlights: Pt/BiFeO3 /La0.7 Sr0.3 MnO3 photovoltaic devices were integrated on PMN-PT single crystals. The piezoelectric strain of PMN-PT enhances the power conversion efficiency of the devices. The dynamic strain engineering is an unique approach for enhancing power conversion efficiency.