Solution-processed photodetectors from colloidal silicon nano/micro particle composite

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 thro...

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Bibliographic Details
Published inOptics express Vol. 18; no. 21; pp. 21622 - 21627
Main Authors Tu, Chang-Ching, Tang, Liang, Huang, Jiangdong, Voutsas, Apostolos, Lin, Lih Y
Format Journal Article
LanguageEnglish
Published United States 11.10.2010
Subjects
Colloids - chemistry
Electrochemistry - methods
Ligands
Light
Metal Nanoparticles - chemistry
Nanocomposites - chemistry
Nanoparticles
Optics and Photonics
Porosity
Quantum Theory
Scattering, Radiation
Semiconductors
Silicon - chemistry
Surface Properties
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Summary: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.
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ISSN:1094-4087
1094-4087
DOI:10.1364/oe.18.021622