期刊
NANO LETTERS
卷 21, 期 18, 页码 7761-7768出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c02725
关键词
mix-phase nanowire; hot electrons; InAs; radial heterostructure; photovoltaics
类别
资金
- National Natural Science Foundation of China [11991063, 62004207, 62074085, 62104118]
- International Partnership Program of Chinese Academy of Sciences [181331KYSB20200012]
- Royal Society-Newton Advanced Fellowship [NA170214]
- Shanghai Science and Technology Committee [18JC1420401, 20YF1455900]
- Chinese Academy of Sciences Foundation [2019-169]
- Strategic Priority Research Program of Chinese Academy of Sciences [XDB43010200]
- Youth Innovation Promotion Association of the Chinese Academy of Sciences
The proposed method offers a feasible route to store and efficiently collect hot electrons by intentionally mixing different phases in III-V semiconductor nanowires, generating additional energy levels to capture and store hot electrons, while core/shell nanowires demonstrate superiority in extracting hot electrons.
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, similar to 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.
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