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 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 - Dec 1 2007
Event2007 AIChE Annual Meeting - Salt Lake City, UT, United States
Duration: Nov 4 2007Nov 9 2007

Other

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

Fingerprint

Nanowires
Quantum Dots
Semiconductor quantum dots
Solar cells
Electrons
Methenamine
Light
Photocathodes
Open circuit voltage
Lakes
Short circuit currents
Oxides
Electrolytes
Adsorption
Conversion efficiency
Glass
Nitrates
Anodes
Electrodes
Zinc

ASJC Scopus subject areas

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

Cite this

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

Nanowire-based quantum-dot-sensitized solar cells. / Leschkies, Kurtis S.; Divakar, Ramachandran; Basu, Joysurya; Enache-Pommer, Emil; Boercker, Janice E.; Carter, C. Barry; Kortshagen, Uwe R.; Norris, David J.; Aydil, Eray.

2007 AIChE Annual Meeting. 2007.

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

Leschkies, KS, Divakar, R, Basu, J, Enache-Pommer, E, Boercker, JE, Carter, CB, Kortshagen, UR, Norris, DJ & Aydil, E 2007, Nanowire-based quantum-dot-sensitized solar cells. in 2007 AIChE Annual Meeting. 2007 AIChE Annual Meeting, Salt Lake City, UT, United States, 11/4/07.
Leschkies KS, Divakar R, Basu J, Enache-Pommer E, Boercker JE, Carter CB et al. Nanowire-based quantum-dot-sensitized solar cells. In 2007 AIChE Annual Meeting. 2007
Leschkies, Kurtis S. ; Divakar, Ramachandran ; Basu, Joysurya ; Enache-Pommer, Emil ; Boercker, Janice E. ; Carter, C. Barry ; Kortshagen, Uwe R. ; Norris, David J. ; Aydil, Eray. / Nanowire-based quantum-dot-sensitized solar cells. 2007 AIChE Annual Meeting. 2007.
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