Journal
ACS NANO
Volume 6, Issue 6, Pages 5627-5634Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn301567c
Keywords
electrodeposition; nanogap; electromigration; photodetector; cadmium selenide
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Funding
- National Science Foundation [CHE-0956524]
- University of California Irvine, School of Physical Sciences Center for Solar Energy
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [0960179] Funding Source: National Science Foundation
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Nanocrystalline cadmium selenide (nc-CdSe) was electrodeposited within a sub-50 nm gold nanogap, prepared by feedback-controlled electromigration, to form a photoconductive metal-semiconductor-metal nanojunction. Both gap formation and electrodeposition were rapid and automated. The electrodeposited nc-CdSe was stoichiometric, single cubic phase with a mean grain diameter of similar to 7 nm. Optical absorption, photoluminescence, and the spectral photoconductivity response of the nc-CdSe were all dominated by band-edge transitions. The photoconductivity of these nc-CdSe-filled gold nanogaps was characterized by a detectivity of 6.9 x 10(10) Jones and a photosensitivity of 500. These devices also demonstrated a maximum photoconductive gain of similar to 45 and response and recovery times below 2 mu s, corresponding to a 3 dB bandwidth of at least 175 kHz.
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