Journal
OPTICS EXPRESS
Volume 18, Issue 21, Pages 21622-21627Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.18.021622
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Funding
- National Science Foundation [ECCS0925378]
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [0925378] Funding Source: National Science Foundation
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We demonstrate solution-processed photodetectors composed of heavy-metal-free Si nano/micro particle composite. The colloidal Si particles are synthesized by electrochemical etching of Si wafers, followed by ultra-sonication to pulverize the porous surface. With alkyl ligand surface passivation through hydrosilylation reaction, the particles can form a stable colloidal suspension which exhibits bright photoluminescence under ultraviolet excitation and a broadband extinction spectrum due to enhanced scattering from the micro-size particles. The efficiency of the thin film photodetectors has been substantially improved by preventing oxidation of the particles during the etching process. (C) 2010 Optical Society of America
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