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Solar energy converters based on multi-junction photoemission solar cells

机译：基于多结光发射太阳能电池的太阳能转换器

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Multi-junction solar cells with multiple p–n junctions made of different semiconductor materials have multiple bandgaps that allow reducing the relaxation energy loss and substantially increase the power-conversion efficiency. The choice of materials for each sub-cell is very limited due to the difficulties in extracting the current between the layers caused by the requirements for lattice- and current-matching. We propose a new vacuum multi-junction solar cell with multiple p-n junctions separated by vacuum gaps that allow using different semiconductor materials as cathode and anode, both activated to the state of effective negative electron affinity (NEA). In this work, the compact proximity focused vacuum tube with the GaAs(Cs,O) photocathode and AlGaAs/GaAs-(Cs,O) anode with GaAs quantum wells (QWs) is used as a prototype of a vacuum single-junction solar cell. The photodiode with the p-AlGaAs/GaAs anode showed the spectral power-conversion efficiency of about 1% at V bias = 0 in transmission and reflection modes, while, at V bias = 0.5 V, the efficiency increased up to 10%. In terms of energy conservation, we found the condition at which the energy cathode-to-anode transition was close to 1. Considering only the energy conservation part, the NEA-cell power-conversion efficiency can rich a quantum yield value which is measured up to more than 50%.
机译：由不同半导体材料制成的具有多个p–n结的多结太阳能电池具有多个带隙，可以减少弛豫能量损失并显着提高功率转换效率。由于晶格匹配和电流匹配的要求而导致难以提取层之间的电流，因此每个子电池的材料选择非常有限。我们提出了一种新型的真空多结太阳能电池，该电池具有多个被真空间隙隔开的p-n结，允许使用不同的半导体材料作为阴极和阳极，两者均被激活为有效负电子亲和力（NEA）状态。在这项工作中，具有GaAs（Cs，O）光电阴极和带有GaAs量子阱（QWs）的AlGaAs / GaAs-（Cs，O）阳极的紧凑型接近聚焦真空管被用作真空单结太阳能电池的原型。 。带有p-AlGaAs / GaAs阳极的光电二极管在透射和反射模式下，当Vbias = 0时，光谱功率转换效率约为1％，而当Vbias = 0.5V时，效率提高了10％。在节能方面，我们发现了能量从阴极到阳极的跃迁接近于1的条件。仅考虑节能部分，NEA电池的功率转换效率就可以丰富一个量子产率值，该量值可以向上测量。超过50％。

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