Valley Photovoltaics and the Search for the Hot Carrier Solar Cell
Valley Photovoltaics and the Search for the Hot Carrier Solar Cell
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Valley Photovoltaics 和寻找热载流子太阳能电池
DOI：
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
V. R. Whiteside
中科院分区：
文献类型：
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作者：
D. Ferry;S. Goodnick;I. Sellers;V. R. Whiteside
为了实现热载流子太阳能电池，必须：（a）防止声子的显著能量损失;以及（B）主要提取热载流子。我们最近提出了一种新的方法来解决这些问题，通过使用亚稳的上能级来存储光生载流子。基于InGaAs/InAlAs结构的概念电池的验证已经产生了令人鼓舞的结果，表明谷存储正在发生并且产生$V_{OC} > E_{G}$。然而，由于两种材料中L谷之间的势垒，电流输出明显受到限制。新材料可以提供解决这个问题的方案，并导致一个新的HCSC大大提高效率。
In order to achieve a hot carrier solar cell, one must: (a) prevent significant energy loss to phonons; and (b) extract primarily the hot carriers. We have recently suggested a new approach to these problems by using metastable upper energy levels to store the photogenerated carriers. A proof of concept cell based upon an InGaAs/InAlAs structure has yielded encouraging results that suggest that valley storage is occurring and yielding a $V_{OC} > E_{G}$. Current output, however, is restricted apparently due to a barrier between the L valleys in the two materials. New materials may provide the solution to this problem and lead to a new HCSC with greatly enhanced efficiency.