An energy-harvesting scheme utilizing Ga-rich CuIn (1-x) Ga x Se 2 quantum dots for dye-sensitized solar cells

Chin An Lin, K. P. Huang, S. T. Ho, Mei Wen Huang, Jr-Hau He*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Ga-rich CuIn (1-x) Ga x Se 2 (CIGS) quantum dots (QDs) with a wide bandgap of 1.58 eV were utilized in dye-sensitized solar cells for energy harvesting. Ga-rich CIGS QDs at TiO 2 photoanodes afford the recombination reduction and thus suppress the dark current, leading to the increase of short-circuit current from 14.47 to 15.27 mA·cm -2 and open-circuit voltage from 751 to 762 mV. This is due to well-adjusted conduction band minimum of Ga-rich CIGS QDs between that of TiO 2 and excited state oxidation potential of N719, enhancing the photoelectron collection and suppressing electron back-transfer from TiO 2 to oxidized redox species in the electrolyte.

Original languageEnglish (US)
Article number123901
JournalApplied Physics Letters
Volume101
Issue number12
DOIs
StatePublished - Sep 17 2012

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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