High Open Circuit Voltage Quantum Dot Sensitized Solar Cells Manufactured with ZnO Nanowire Arrays and Si/ZnO Branched Hierarchical Structures

Title
High Open Circuit Voltage Quantum Dot Sensitized Solar Cells Manufactured with ZnO Nanowire Arrays and Si/ZnO Branched Hierarchical Structures
Author(s)
송태섭P. Sudhagar[P. Sudhagar]Dong Hyun Lee[Dong Hyun Lee]Iv?n Mora-Ser?[Iv?n Mora-Ser?]Juan Bisquert[Juan Bisquert]Michael Laudenslager[Michael Laudenslager]Wolfgang M. Sigmund[Wolfgang M. Sigmund]Won Il Park[Won Il Park]Ungyu Paik[Ungyu Paik]Yong Soo Kang[Yong Soo Kang]
Keywords
EXTINCTION COEFFICIENT; CDSE; NANOCRYSTALS; RECOMBINATION; DEVICES; FILMS
Issue Date
201108
Publisher
AMER CHEMICAL SOC
Citation
JOURNAL OF PHYSICAL CHEMISTRY LETTERS, v.2, no.16, pp.1984 - 1990
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, V(oc), 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 V(oc). V(oc) 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.
URI
http://hdl.handle.net/YU.REPOSITORY/24750http://dx.doi.org/10.1021/jz200848v
ISSN
1948-7185
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공과대학 > 신소재공학부 > Articles
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