石墨烯集热器驱动的高效率热离子太阳能电池设计
Designing a Concentrated High-Efficiency Thermionic Solar Cell Enabled by Graphene Collector
摘要：
我们提出了一个集中的电子发射太阳能电池的设计，这表明了一个高的太阳能到电能的转换效率大于10%的600太阳下，通过利用特殊的电，热和辐射性能的石墨烯作为集电极。通过构建一个分析模型，明确考虑到非理查森行为的电子发射电流从石墨烯，在真空间隙中的空间电荷效应，和各种不可逆的能量损失的子组件内，我们进行了详细的表征的转换效率限制和电功率输出特性的建议系统。系统地模拟和比较了石墨烯-石墨烯、石墨烯-金刚石和金刚石-金刚石等不同结构的双光子发射体的能量转换效率，结果表明，采用金刚石薄膜作为发射体，石墨烯作为收集体的能量转换效率最高，从而揭示了石墨烯在实现高性能双光子发射太阳能电池中的重要作用。在800个太阳下，其最大效率为12.8%，明显高于现有的几种固态太阳能电池设计，如太阳能驱动的热电转换器和热光伏转换器。因此，我们的工作开辟了新的途径，以提高电子太阳能转换的效率极限和下一代基于新型纳米材料的太阳能收集技术的发展。
英文摘要：
We propose a concentrated thermionic emission solar cell design, which demonstrates a high solar-to-electricity energy conversion efficiency larger than 10\% under 600 sun, by harnessing the exceptional electrical, thermal and radiative properties of the graphene as a collector electrode. By constructing an analytical model that explicitly takes into account the non-Richardson behavior of the thermionic emission current from graphene, space charge effect in vacuum gap, and the various irreversible energy losses within the subcomponents, we perform a detailed characterization on the conversion efficiency limit and electrical power output characteristics of the proposed system. We systematically model and compare the energy conversion efficiency of various configurations of graphene-graphene and graphene-diamond and diamond-diamond thermionic emitter, and show that utilizing diamond films as an emitter and graphene as a collector offers the highest maximum efficiency, thus revealing the important role of graphene in achieving high-performance thermionic emission solar cell. A maximum efficiency of 12.8\% under 800 sun has been revealed, which is significantly higher than several existing solid-state solar cell designs, such as the solar-driven thermoelectric and thermophotovoltaic converters. Our work thus opens up new avenues to advance the efficiency limit of thermionic solar energy conversion and the development of next-generation novel-nanomaterial-based solar energy harvesting technology.
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