Slowing Hot-Electron Relaxation in Mix-Phase Nanowires for Hot-Carrier Photovoltaics,Nano Letters

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Slowing Hot-Electron Relaxation in Mix-Phase Nanowires for Hot-Carrier Photovoltaics
Nano Letters ( IF 9.6 ) Pub Date : 2021-08-30 , DOI: 10.1021/acs.nanolett.1c02725
Hailu Wang _{1,

2} , Fang Wang _{1,

2} , Tengfei Xu _{1,

3} , Hui Xia _{1,

2} , Runzhang Xie _{1,

2} , Xiaohao Zhou _{1,

2} , Xun Ge _{1,

4} , Weiwei Liu _{1,

2} , Yicheng Zhu _{1,

2} , Liaoxin Sun _{1,

2} , Jiaxiang Guo _{1,

2} , Jiafu Ye _{1,

2} , Muhammad Zubair _{1,

2} , Man Luo ₅ , Chenhui Yu ₅ , Deyan Sun ₄ , Tianxin Li _{1,

2} , Qiandong Zhuang ₆ , Lan Fu ₇ , Weida Hu _{1,

2} , Wei Lu _{1,

2,

8}

Affiliation

Hot carrier harvest could save 30% energy loss in solar cells. So far, however, it is still unreachable as the photoexcited hot carriers are short-lived, ∼1 ps, determined by a rapid relaxation process, thus invalidating any reprocessing efforts. Here, we propose and demonstrate a feasible route to reserve hot electrons for efficient collection. It is accomplished by an intentional mix of cubic zinc-blend and hexagonal wurtzite phases in III–V semiconductor nanowires. Additional energy levels are then generated above the conduction band minimum, capturing and storing hot electrons before they cool down to the band edges. We also show the superiority of core/shell nanowire (radial heterostructure) in extracting hot electrons. The strategy disclosed here may offer a unique opportunity to modulate hot carriers for efficient solar energy harvest.

中文翻译：

减缓热载流子光伏混合相纳米线中的热电子弛豫

热载流子收获可以节省太阳能电池 30% 的能量损失。然而，到目前为止，它仍然无法实现，因为光激发的热载流子寿命很短，约 1 ps，由快速弛豫过程决定，从而使任何再处理工作无效。在这里，我们提出并展示了一种保留热电子以进行有效收集的可行途径。它是通过在 III-V 族半导体纳米线中有意混合立方锌混合物和六方纤锌矿相来实现的。然后在导带最小值以上产生额外的能级，在热电子冷却到能带边缘之前捕获和存储热电子。我们还展示了核/壳纳米线（径向异质结构）在提取热电子方面的优越性。这里公开的策略可能提供一个独特的机会来调节热载流子以实现高效的太阳能收集。

更新日期：2021-09-22

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