Abstract
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.
Original language | English |
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Pages (from-to) | 21622-21627 |
Number of pages | 6 |
Journal | Optics Express |
Volume | 18 |
Issue number | 21 |
DOIs | |
State | Published - 11 Oct 2010 |