title: Ferroelectric BiFeO3as an Oxide Dye in Highly Tunable Mesoporous All-Oxide Photovoltaic Heterojunctions.
abstract: As potential photovoltaic materials, transition-metal oxides such as BiFeO3(BFO) are capable of absorbing a substantial portion of solar light and incorporating ferroic orders into solar cells with enhanced performance. But the photovoltaic application of BFO has been hindered by low energy-conversion efficiency due to poor carrier transport and collection. In this work, a new approach of utilizing BFO as a light-absorbing sensitizer is developed to interface with charge-transporting TiO2nanoparticles. This mesoporous all-oxide architecture, similar to that of dye-sensitized solar cells, can effectively facilitate the extraction of photocarriers. Under the standard AM1.5 (100 mW cm-2) irradiation, the optimized cell shows an open-circuit voltage of 0.67 V, which can be enhanced to 1.0 V by tailoring the bias history. A fill factor of 55% is achieved, which is much higher than those in previous reports on BFO-based photovoltaic devices. The results provide here a new viable approach toward developing highly tunable and stable photovoltaic devices based on ferroelectric transition-metal oxides.
authors.affiliation: Materials Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia.
authors.forename: Lingfei
authors.initials: L
authors.lastname: Wang
authors.affiliation: School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, P. R. China.
authors.forename: He
authors.initials: H
authors.lastname: Ma
authors.affiliation: School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798.
authors.forename: Lei
authors.initials: L
authors.lastname: Chang
authors.affiliation: Materials Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia.
authors.forename: Chun
authors.initials: C
authors.lastname: Ma
authors.affiliation: School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, P. R. China.
authors.forename: Guoliang
authors.initials: G
authors.lastname: Yuan
authors.affiliation: School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798.
authors.forename: Junling
authors.initials: J
authors.lastname: Wang
authors.affiliation: Materials Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia.
authors.forename: Tom
authors.initials: T
authors.lastname: Wu
keywords: bismuth ferrite; mesoporous TiO2; oxide; photovoltaics