Nanowire-based quantum-dot-sensitized solar cells

Kurtis S. Leschkies, Ramachandran Divakar, Joysurya Basu, Emil Enache-Pommer, Janice E. Boercker, C. Barry Carter, Uwe R. Kortshagen, David J. Norris, Eray S. Aydil

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A new kind of quantum-dot-sensitized solar cell that combines CdSe quantum dots adsorbed on ZnO nanowires to convert light into electrical current flow was described. An array of ZnO nanowires was grown vertically on a transparent and conducting glass substrate in aqueous solutions of methenamine and zinc nitrate at ∼ 95°C. Nanometer-size CdSe quantum dots were synthesized separately and capped with mercaptopropionic acid. When illuminated with visible light, the excited CdSe quantum dots injected electrons across the quantum dot-nanowire interface into the ZnO nanowires. The morphology of the nanowires then provided the photoinjected electrons with a direct electrical pathway to the transparent conducting oxide anode. After the electron was injected into the ZnO, the positively-charged CdSe quantum dot was reduced through an electrochemical reaction with I- in the electrolyte to form I3- which in turn was reduced at the photocathode by an electron that has traveled across the load to complete the circuit. These solar cells exhibited short-circuit currents ranging from 1-2 mA/sq cm and open-circuit voltages of ∼ 0.6 v when illuminated with 100 mw/sq cm simulated AM1.5 spectrum. The overall conversion efficiency is limited by the availability of ZnO nanowire surface area for quantum dot adsorption. This is an abstract of a paper presented at the AIChE Annual Meeting (Salt Lake, UT 11/4-9/2007).

Original languageEnglish (US)
Title of host publication2007 AIChE Annual Meeting
StatePublished - 2007
Event2007 AIChE Annual Meeting - Salt Lake City, UT, United States
Duration: Nov 4 2007Nov 9 2007

Publication series

Name2007 AIChE Annual Meeting

Other

Other2007 AIChE Annual Meeting
CountryUnited States
CitySalt Lake City, UT
Period11/4/0711/9/07

ASJC Scopus subject areas

  • Biotechnology
  • Chemical Engineering(all)
  • Bioengineering
  • Safety, Risk, Reliability and Quality

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  • Cite this

    Leschkies, K. S., Divakar, R., Basu, J., Enache-Pommer, E., Boercker, J. E., Carter, C. B., Kortshagen, U. R., Norris, D. J., & Aydil, E. S. (2007). Nanowire-based quantum-dot-sensitized solar cells. In 2007 AIChE Annual Meeting (2007 AIChE Annual Meeting).