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arXiv 2302.04788physics.app-phcond-mat.mes-hallcond-mat.mtrl-sciphysics.optics
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2D激子太阳能电池有多好?

How Good Can 2D Excitonic Solar Cells Be?

Zekun Hu, Da Lin, Jason Lynch, Kevin Xu, Deep Jariwala

摘要:

激子半导体已经成为光伏应用的研究主题数十年。其中,基于有机聚合物和小分子的太阳能电池目前的功率转换效率(PCE)已超过19%。随着有机光伏材料(OPV)的日益成熟,二维过渡金属二硫属化物(TMDC)等强激子无机半导体材料的出现,由于其高的光学常数、稳定的无机结构和亚nm的薄膜厚度,激发子太阳能电池的研究又重新受到人们的关注。虽然已经发布了几份关于基于TMDC的PV的报告,但在一个太阳AM1.5G照明下实现高于6%的功率转换效率仍然具有挑战性。在这里,我们进行了全面的光学和电子分析的设计,结构和性能的单层TMDC为基础的,单结激子PV。我们的计算模型与优化性能预测的PCE为9.22%的超晶格器件结构。我们的分析表明,虽然二维激子太阳能电池的PCE可能被限制在<10%,但我们提出的设计可以实现> 100 W g-1的比功率,使它们在航空航天,分布式遥感和可穿戴电子产品中具有吸引力。

英文摘要:

Excitonic semiconductors have been a subject of research for photovoltaic applications for many decades. Among them, the organic polymers and small molecules based solar cells have now exceeded 19% power conversion efficiency (PCE). While organic photovoltaics (OPVs) are approaching maturity, the advent of strongly excitonic inorganic semiconductors such as two-dimensional transition metal dichalcogenides (TMDCs) has renewed interest in excitonic solar cells due to their high-optical constants, stable inorganic structure and sub-nm film thicknesses. While several reports have been published on TMDC based PVs, achieving power conversion efficiencies higher than 6% under one-sun AM1.5G illumination has remained challenging. Here, we perform a full optical and electronic analysis of design, structure and performance of monolayer TMDC based, single-junction excitonic PVs. Our computational model with optimized properties predicts a PCE of 9.22% in a superlattice device structure. Our analysis suggests that, while the PCE for 2D excitonic solar cells may be limited to < 10%, a specific power > 100 W g-1 may be achieved with our proposed designs, making them attractive in aerospace, distributed remote sensing, and wearable electronics.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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