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Investigation of carrier collection from QD TJSCs

机译:QD TJSC收集载体的调查

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Quantum dot triple junction solar cells (QD TJSCs) have potential for higher efficiency for space and terrestrial applications. Extended absorption in the QD layers can increase efficiency by increasing the short circuit current density of the device, as long as carrier extraction remains efficient and quality of the bulk material remains high. Experimental studies have been conducted to quantify the carrier extraction probability from quantum confined levels and bulk material. One studies present insight to the carrier extraction mechanisms from the quantum confined states through the use of temperature dependent measurements. A second study analyses the loss in carrier collection probability in the bulk material by investigating the change in minority carrier lifetimes and surface recombination velocity throughout the device. Recent studies for space applications have shown response from quantum structures to have increased radiation tolerance. The role strain and bonding strength within the quantum structures play in improving the radiation tolerance is investigated. The combination of sufficiently good bulk material and device enhancement from the quantum confinement leads to temperature dependent measurements that show TJSCs outperform baseline TJSCs near and above 60℃. Insight into the physical mechanisms behind this phenomenon is presented.
机译:量子点三结太阳能电池(QD TJSC)具有在太空和地面应用中提高效率的潜力。 QD层中的扩展吸收可以通过增加器件的短路电流密度来提高效率,只要载流子提取仍然有效并且块状材料的质量仍然很高。已经进行了实验研究以量化从量子限制能级和块状材料中提取载流子的可能性。一项研究通过使用温度相关的测量方法,揭示了从量子约束状态中提取载流子的机理。第二项研究通过研究整个器件中少数载流子寿命和表面复合速度的变化,分析了散装材料中载流子收集概率的损失。太空应用的最新研究表明,量子结构的响应具有更高的辐射耐受性。研究了量子结构中的应变和键合强度在提高辐射耐受性中的作用。足够好的块状材料和量子限制带来的器件增强相结合,导致了与温度相关的测量,结果表明,TJSC在60℃及以上的温度优于基线TJSC。介绍了对这一现象背后的物理机制的了解。

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