Visible to near-infrared light harvesting in Ag 2S nanoparticles/ZnO nanowire array photoanodes

Jih-Jen Wu, Ru Chun Chang, Dian Wei Chen, Chun Te Wu

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

Pronounced absorption in the visible-NIR range of 400-1300 nm is demonstrated in the Ag 2S nanoparticles (NPs)/ZnO nanowire (NW) array. ZnO NW arrays are grown on indium tin oxide substrates using chemical bath deposition. The Ag 2S NPs are sequentially formed on the ZnO NWs through sonochemical synthesis. Structural characterizations indicate the slight deconstruction of surface of ZnO NWs during Ag 2S NPs formation. By employing polysulfide electrolyte, short-circuit current (J sc), open-circuit voltage and therefore the efficiency of the Ag 2S NP-sensitized ZnO NW solar cell are improved with increasing the initial sulfur concentration in the sulfur-polysulfide electrolyte. The Ag 2S NP-sensitized ZnO NW solar cell shows a conversion efficiency of 0.49% with a superior J sc of ∼13.7 mA cm -2 under AM 1.5 illumination at 100 mW cm -2. Incident photon conversion efficiency measurements reveal that Ag 2S NPs contribute to 33.4% and 65.2% of J sc in the wavelength ranges of 400-700 nm and 700-1300 nm, respectively.

Original languageEnglish
Pages (from-to)1368-1372
Number of pages5
JournalNanoscale
Volume4
Issue number4
DOIs
Publication statusPublished - 2012 Feb 21

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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