Ferroelectric BiFeO₃ as an Oxide Dye in Highly Tunable Mesoporous All-Oxide Photovoltaic Heterojunctions

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• 作者：Lingfei Wang ; He Ma ; Lei Chang ; Chun Ma ; Guoliang Yuan ; Junling Wang and Tom Wu
• 刊名：Small
• 出版年：2017
• 出版时间：January 4, 2017
• 年：2017
• 卷：13
• 期：1
• 全文大小：3638K
• ISSN：1613-6829

文摘

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 TiO₂ nanoparticles. 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.