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首页> 外文期刊>ACS applied materials & interfaces >Dual-Layer Nanostructured Flexible Thin-Film Amorphous Silicon Solar Cells with Enhanced Light Harvesting and Photoelectric Conversion Efficiency
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Dual-Layer Nanostructured Flexible Thin-Film Amorphous Silicon Solar Cells with Enhanced Light Harvesting and Photoelectric Conversion Efficiency

机译：具有增强的光收集和光电转换效率的双层纳米结构柔性薄膜非晶硅太阳能电池

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摘要

Three-dimensional (3-D) structures have triggered tremendous interest for thin-film solar cells since they can dramatically reduce the material usage and incident light reflection. However, the high aspect ratio feature of some 3-D structures leads to deterioration of internal electric field and carrier collection capability, which reduces device power conversion efficiency (PCE). Here, we report high performance flexible thin-film amorphous silicon solar cells with a unique and effective light trapping scheme. In this device structure, a polymer nanopillar membrane is attached on top of a device, which benefits broadband and omnidirectional performances, and a 3-D nanostructure with shallow dent arrays underneath serves as a back reflector on flexible titanium (Ti) foil resulting in an increased optical path length by exciting hybrid optical modes. The efficient light management results in 42.7% and 41.7% remarkable improvements of short-circuit current density and overall efficiency, respectively. Meanwhile, an excellent flexibility has been achieved as PCE remains 97.6% of the initial efficiency even after 10 000 bending cycles. This unique device structure can also be duplicated for other flexible photovoltaic devices based on different active materials such as CdTe, Cu(In,Ga)Se-2 (CIGS), organohalide lead perovskites, and so forth.
机译：三维（3-D）结构引起了薄膜太阳能电池的极大兴趣，因为它们可以显着减少材料的使用和入射光的反射。但是，某些3-D结构的高长宽比特性导致内部电场和载流子收集能力的下降，从而降低了器件功率转换效率（PCE）。在这里，我们报告了具有独特且有效的光捕获方案的高性能柔性薄膜非晶硅太阳能电池。在这种器件结构中，聚合物纳米柱状膜附着在器件顶部，这有利于宽带和全向性能，并且其下方具有浅凹痕阵列的3-D纳米结构可作为柔性钛（Ti）箔上的背反射器，从而产生通过激发混合光学模式增加光程长度。高效的光管理可以使短路电流密度和整体效率分别显着提高42.7％和41.7％。同时，即使经过10 000次弯曲后，PCE仍可保持初始效率的97.6％，从而实现了出色的柔韧性。这种独特的器件结构也可以用于基于不同活性材料（例如CdTe，Cu（In，Ga）Se-2（CIGS），有机卤化物钙钛矿等）的其他柔性光伏器件。

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