期刊
ADVANCED MATERIALS
卷 30, 期 20, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201800413
关键词
CdS; CdSe; core-shell structures; nanostructures; photodetectors
类别
资金
- European Research Council (ERC) [338849]
- Israel Science Foundation
- Minerva Stiftung, Kimmel Center for Nanoscale Science
- Moskowitz Center for Nano and Bio-Nano Imaging
- Perlman Family Foundation
1D core-shell heterojunction nanostructures have great potential for high-performance, compact optoelectronic devices owing to their high interface area to volume ratio, yet their bottom-up assembly toward scalable fabrication remains a challenge. Here the site-controlled growth of aligned CdS-CdSe core-shell nanowalls is reported by a combination of surface-guided vaporliquid-solid horizontal growth and selective-area vapor-solid epitaxial growth, and their integration into photodetectors at wafer-scale without postgrowth transfer, alignment, or selective shell-etching steps. The photocurrent response of these nanowalls is reduced to 200 ns with a gain of up to 3.8 x 10(3) and a photoresponsivity of 1.2 x 10(3) A W-1, the fastest response at such a high gain ever reported for photodetectors based on compound semiconductor nanostructures. The simultaneous achievement of sub-microsecond response and high-gain photocurrent is attributed to the virtues of both the epitaxial CdS-CdSe heterojunction and the enhanced charge-separation efficiency of the core-shell nanowall geometry. Surface-guided nanostructures are promising templates for wafer-scale fabrication of self-aligned core-shell nanostructures toward scalable fabrication of high-performance compact photodetectors from the bottom-up.
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