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Improved photovoltaic performance from inorganic perovskite oxide thin films with mixed crystal phases
Nature Photonics ( IF 35.0 ) Pub Date : 2018-04-09 , DOI: 10.1038/s41566-018-0137-0
Joyprokash Chakrabartty , Catalin Harnagea , Mert Celikin , Federico Rosei , Riad Nechache

Inorganic ferroelectric perovskites are attracting attention for the realization of highly stable photovoltaic cells with large open-circuit voltages. However, the power conversion efficiencies of devices have been limited so far. Here, we report a power conversion efficiency of ~4.20% under 1 sun illumination from Bi–Mn–O composite thin films with mixed BiMnO3 and BiMn2O5 crystal phases. We show that the photocurrent density and photovoltage mainly develop across grain boundaries and interfaces rather than within the grains. We also experimentally demonstrate that the open-circuit voltage and short-circuit photocurrent measured in the films are tunable by varying the electrical resistance of the device, which in turn is controlled by externally applying voltage pulses. The exploitation of multifunctional properties of composite oxides provides an alternative route towards achieving highly stable, high-efficiency photovoltaic solar energy conversion.



中文翻译:

具有混合晶相的无机钙钛矿氧化物薄膜改善了光伏性能

无机铁电钙钛矿正在引起人们的注意,以实现具有大开路电压的高度稳定的光伏电池。但是,迄今为止,设备的功率转换效率受到限制。在这里,我们报道了由Bi–Mn–O混合BiMnO 3和BiMn 2 O 5组成的复合薄膜在1种阳光照射下的功率转换效率为〜4.20 晶相。我们表明,光电流密度和光电压主要跨越晶粒边界和界面而不是晶粒内部发展。我们还通过实验证明,通过改变器件的电阻可以调节薄膜中测得的开路电压和短路光电流,而器件的电阻又可以通过外部施加电压脉冲来控制。复合氧化物多功能性能的开发为实现高度稳定,高效的光伏太阳能转化提供了另一种途径。

更新日期:2018-04-10
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