期刊
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
卷 208, 期 2, 页码 474-479出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssa.201026276
关键词
CdS; CdSe; charge transfer; nanocomposites; quantum dots; solar cells; ZnO
资金
- Ministry of Education, Science and Technology (MEST) [2010-0001842, 2009-0094032]
- WCU (World Class University) [R31-2008-000-10092]
- National Research Foundation of Korea [2008-0062496] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This paper proposes the concept of using bisensitizers (CdS and CdSe) to improve the light-harvesting capabilities and charge transfer in ZnO photoelectrodes. The novel flower-like ZnO nanoarrays were grown by chemical bath deposition and they are sensitized with CdS quantum dots (QDs) and a CdSe overlayer. We observed a strong quenching of band-edge emission following the growth of QDs on ZnO, which is evidence for the occurrence of charge transfer between the QDs and the ZnO. A possible charge-transfer mechanism is proposed and discussed on the basis of energy-band alignment. Bisensitized ZnO electrodes resulted in a higher photoconversion efficiency (eta=1.08%) than that of single CdS QD-sensitized solar cells (eta=0.52%). The high photocurrent and improved power conversion are attributed to more charge-carrier generation facilitated by an extended spectral response and charge injection between the QDs and TiO2. [GRAPHICS] Schematic representation of CdS and CdSe bisensitized flower-like ZnO solar cell structure investigated in this study. (C) 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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