过渡金属二硫族化物太阳能电池的效率极限
Efficiency Limit of Transition Metal Dichalcogenide Solar Cells
AI总结：
本研究确定了多层TMD太阳能电池的效率极限，发现50纳米薄膜在现有材料质量下可实现25%的转换效率，适用于高比功率光伏。
摘要：
过渡金属二硫族化物（TMDs）因其高光学吸收、理想的带隙和自钝化表面，在高比功率（即单位重量功率）太阳能电池中作为吸收材料展现出巨大潜力。然而，TMD太阳能电池的最终性能极限至今仍未知。在此，我们建立了多层MoS2、MoSe2、WS2和WSe2太阳能电池在AM 1.5 G光照下效率极限与TMD薄膜厚度及材料质量的关系。我们使用扩展的详细平衡方法，该方法除了辐射损失外，还包含了俄歇复合和缺陷辅助的Shockley-Read-Hall复合机制，这些机制基于测量的光学吸收光谱计算得出。我们证明，采用目前可获得的材料质量，厚度仅为50 nm的TMD薄膜的单结太阳能电池实际上可实现高达25%的功率转换效率，使其成为高比功率光伏的绝佳选择。
英文摘要：
Transition metal dichalcogenides (TMDs) show great promise as absorber materials in high-specific-power (i.e. high-power-per-weight) solar cells, due to their high optical absorption, desirable band gaps, and self-passivated surfaces. However, the ultimate performance limits of TMD solar cells remain unknown today. Here, we establish the efficiency limits of multilayer MoS2, MoSe2, WS2, and WSe2 solar cells under AM 1.5 G illumination as a function of TMD film thickness and material quality. We use an extended version of the detailed balance method which includes Auger and defect-assisted Shockley-Reed-Hall recombination mechanisms in addition to radiative losses, calculated from measured optical absorption spectra. We demonstrate that single-junction solar cells with TMD films as thin as 50 nm could in practice achieve up to 25% power conversion efficiency with the currently available material quality, making them an excellent choice for high-specific-power photovoltaics.
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