Browsing by Author "Guozhong Cao"

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    Enhanced photovoltaic performance of nanostructured hybrid solar cell using highly oriented TiO2nanotubes
    (2010-12-16) Supan Yodyingyong; Xiaoyuan Zhou; Qifeng Zhang; Darapond Triampo; Junting Xi; Kwangsuk Park; Benjie Limketkai; Guozhong Cao; University of Washington, Seattle; Mahidol University; Intel Research Laboratories
    Highly oriented TiO2nanotubes have been fabricated using ZnO nanorod template through liquid reactive deposition on the ITO substrates. The diameter and length of TiO2nanotubes can be effectively controlled for the suitable use for a hybrid solar cell by varying the diameter and length of the ZnO nanorod template. A mixture of P3HT/PCBM was infiltrated into the gaps between TiO2nanotubes to form hybrid solar cells. The open circuit voltage, short circuit current density, fill factor, and power conversion efficiency of the hybrid solar cell using highly oriented TiO2nanotubes were 646 mV, 9.95 mA cm-2, 51.6%, and 3.32%, respectively, much higher than 1.2% of hybrid solar cell based on ZnO nanorods tested under otherwise identical conditions and significantly higher than 0.7% of the same type hybrid solar cells reported in literature. The enhancement of the power conversion efficiency could be resulted from the highly oriented TiO2nanotubes with smaller diameter and large specific surface area for the efficient electron transfer in hybrid solar cells. © 2010 American Chemical Society.
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    ZnO nanoparticles and nanowire array hybrid photoanodes for dye-sensitized solar cells
    (2010-03-01) Supan Yodyingyong; Qifeng Zhang; Kwangsuk Park; Christopher S. Dandeneau; Xiaoyuan Zhou; Darapond Triampo; Guozhong Cao; University of Washington, Seattle; Mahidol University
    ZnO nanoparticle-nanowire (NP-NW) array hybrid photoanodes for dye-sensitized solar cell (DSC) with NW arrays to serve as a direct pathway for fast electron transport and NPs dispersed between NWs to offer a high specific surface area for sufficient dye adsorption has been fabricated and investigated to improve the power conversion efficiency (PCE). The overall PCE of the ZnO hybrid photoanode DSC with the N3-sensitized has reached ∼4.2%, much higher than both ∼1.58% of ZnO NW DSC and ∼1.31% of ZnO NP DSC, prepared and tested under otherwise identical conditions. © 2010 American Institute of Physics.