High open circuit voltage quantum dot sensitized solar cells manufactured with ZnO nanowire arrays and Si/ZnO branched hierarchical structures

P. Sudhagar, Taeseup Song, Dong Hyun Lee, Iván Mora-Seró, Juan Bisquert, Michael Laudenslager, Wolfgang M. Sigmund, Won Il Park, Ungyu Paik, Yong Soo Kang

Research output: Contribution to journalArticlepeer-review

70 Citations (Scopus)

Abstract

Quantum dot sensitized solar cells (QDSCs) are currently receiving increasing attention as an alternative to conventional dyes. The efficiencies of QDSCs have experienced a fast growth in the last years, mainly due to an increase in the reported photocurrents and fill factors. Despite this increase, further enhancement of QDSCs needs an improvement of the obtained photovoltage, Voc, being the current main challenge in these devices. Here we show that an appropriated nanostructure of wide band gap semiconductor electrode allows us to reduce the recombination process, with a significant enhancement of Voc. Voc as high as 0.77 V has been demonstrated for ZnO nanowires array electrodes. The performance of the cell can be even increased to a promising 3%, using a novel photoanode architecture of "pine tree" ZnO nanorods (NRs) on Si NWs hierarchical branched structure. Most importantly, we show the necessity of exploring new electrode architectures to improve the current efficiencies of QDSCs.

Original languageEnglish
Pages (from-to)1984-1990
Number of pages7
JournalJournal of Physical Chemistry Letters
Volume2
Issue number16
DOIs
Publication statusPublished - 18 Aug 2011

Keywords

  • Energy Conversion and Storage

ASJC Scopus subject areas

  • Materials Science(all)
  • Physical and Theoretical Chemistry

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