TY - JOUR
T1 - High open circuit voltage quantum dot sensitized solar cells manufactured with ZnO nanowire arrays and Si/ZnO branched hierarchical structures
AU - Sudhagar, P.
AU - Song, Taeseup
AU - Lee, Dong Hyun
AU - Mora-Seró, Iván
AU - Bisquert, Juan
AU - Laudenslager, Michael
AU - Sigmund, Wolfgang M.
AU - Park, Won Il
AU - Paik, Ungyu
AU - Kang, Yong Soo
PY - 2011/8/18
Y1 - 2011/8/18
N2 - 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.
AB - 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.
KW - Energy Conversion and Storage
UR - http://www.scopus.com/inward/record.url?scp=80051917205&partnerID=8YFLogxK
U2 - 10.1021/jz200848v
DO - 10.1021/jz200848v
M3 - Article
AN - SCOPUS:80051917205
SN - 1948-7185
VL - 2
SP - 1984
EP - 1990
JO - Journal of Physical Chemistry Letters
JF - Journal of Physical Chemistry Letters
IS - 16
ER -