The performance of coupled (CdS:CdSe) quantum dot-sensitized TiO2 nanofibrous solar cells

P. Sudhagar, June Hyuk Jung, Suil Park, Yong Gun Lee, R. Sathyamoorthy, Yong Soo Kang, Heejoon Ahn

Research output: Contribution to journalArticlepeer-review

94 Citations (Scopus)

Abstract

Highly porous networks and reduced grain boundaries with one-dimensional (1-D) nanofibrous morphology offer enhanced charge transport in solar cells applications. Quantum dot (QDs) decorated TiO2 nanofibrous electrodes, unlike organic dye sensitizers, can yield multiple carrier generations due to the quantum confinement effect. This paper describes the first attempt to combine these two novel approaches, in which CdS (∼18 nm) and CdSe (∼8 nm) QDs are sensitized onto electrospun TiO2 nanofibrous (diameter ∼80-100 nm) electrodes. The photovoltaic performances of single (CdS and CdSe) and coupled (CdS/CdSe) QDs-sensitized TiO2 fibrous electrodes are demonstrated in sandwich-type solar cells using polysulfide electrolyte. The observed difficulties in charge injection and lesser spectral coverage of single QDs-sensitizers are solved by coupling (CdS:CdSe) two QDs-sensitizers, resulting in a enhanced open-circuit voltage (0.64 V) with 2.69% efficiency. These results suggest the versatility of fibrous electrodes in QDs-sensitized solar cell applications.

Original languageEnglish
Pages (from-to)2220-2224
Number of pages5
JournalElectrochemistry Communications
Volume11
Issue number11
DOIs
Publication statusPublished - Nov 2009

Keywords

  • CdS QDs
  • CdSe QDs
  • QDs-solar cells
  • Quantum efficiency
  • TiO nanofibrous

ASJC Scopus subject areas

  • Electrochemistry

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