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Using spacer layers to control metal and semiconductor absorption in ultrathin solar cells with plasmonic substrates

机译:使用间隔层控制具有等离子基板的超薄太阳能电池中的金属和半导体吸收

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摘要

We systematically explore the performance of ultrathin amorphous silicon solar cells integrated on plasmonic substrates of several different morphologies. Angle-resolved reflectance, external quantum efficiency measurements, and finite-difference time-domain simulations highlight the importance of the spacer layer in determining the mode profiles to which light can couple. Coupling mechanisms are found to strongly differ between periodic silver nanovoid arrays and randomly textured silver substrates. Tailoring the spacer thickness leads to 50% higher quantum efficiencies and short-circuit current densities by tuning the coupling between the near-field and trapped modes with enhanced optical path lengths. The balance of absorption for the plasmonic near field at the metal/semiconductor interface is analytically derived for a broad range of leading photovoltaic materials. This yields key design principles for plasmonic thin-film solar cells, predicting strong near-field enhancement only for CdTe, CuInGaSe2, and organic polymer devices.
机译:我们系统地探索了集成在几种不同形态的等离子体衬底上的超薄非晶硅太阳能电池的性能。角分辨反射率,外部量子效率测量和时域有限差分模拟突出了隔离层在确定光可以耦合到的模式轮廓中的重要性。发现在周期性的银纳米空隙阵列和随机织构的银衬底之间,耦合机制有很大的不同。通过以增强的光程长度来调整近场模式与陷获模式之间的耦合,调整间隔物的厚度可以提高50%的量子效率和短路电流密度。对于各种领先的光伏材料,分析得出了在金属/半导体界面处等离激元近场的吸收平衡。这产生了等离子薄膜太阳能电池的关键设计原理,并预测仅对CdTe,CuInGaSe2和有机聚合物器件具有很强的近场增强能力。

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