Regenerative PbS and CdS quantum dot sensitized solar cells with a cobalt complex as hole mediator

Hyo Joong Lee, Peter Chen, Soo Jin Moon, Frédéric Sauvage, Kevin Sivula, Takeru Bessho, Daniel R. Gamelin, Pascal Comte, Shaik M. Zakeeruddin, Sang Il Seok, Michael Gratzel, Md K. Nazeeruddin

Research output: Contribution to journalArticlepeer-review

256 Citations (Scopus)

Abstract

Metal sulfide (PbS and CdS) quantum dots (QDs) were prepared over mesoporous TiO 2 films by improved successive ionic layer adsorption and reaction (SILAR) processes. The as-prepared QD-sensitized electrodes were combined with a cobalt complex redox couple [Co(o-phen) 3] 2 +/3+ to make a regenerative liquid-type photovoltaic cell. The optimized PbS QD-sensitized solar cells exhibited promising incident photon-to-current conversion efficiency (IPCE) of over 50% and an overall conversion efficiency of 2% at 0.1 sun in a regenerative mode. The overall photovoltaic performance of the PbS QD-sensitized cells was observed to be dependent on the final turn of the SILAR process, giving a better result when the final deposition was Pb 2+, not S 2-. However, in the case of CdS QD-sensitized cells, S 2- termination was better than that of Cd 2+. The cobalt complex herein used as a regenerative redox couple was found to be more efficient in generating photocurrents from PbS QD cells than the typical hole scavenger Na 2S in a three-electrode configuration. The CdS-sensitized cell with this redox mediator also showed better defined current-voltage curves and an IPCE reaching 40%.

Original languageEnglish
Pages (from-to)7602-7608
Number of pages7
JournalLangmuir
Volume25
Issue number13
DOIs
Publication statusPublished - 2009 Jul 7

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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