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

Chang Ching Tu, Liang Tang, Jiangdong Huang, Apostolos Voutsas, Lih Y. Lin

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

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 languageEnglish
Pages (from-to)21622-21627
Number of pages6
JournalOptics Express
Volume18
Issue number21
DOIs
StatePublished - 11 Oct 2010

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