Lee, Byung Hong Song, Mi Yeon Jang, Sung-Yeon Jo, Seong Mu Kwak, Seong-Yeop Kim, Dong Young 2024-01-20T20:05:07Z 2024-01-20T20:05:07Z 2021-09-04 2009-12 1932-7447 https://pubs.kist.re.kr/handle/201004/131929 In this report, dye-sensitized solar cells (DSSCs) with high energy conversion efficiencies were fabricated using TiO2 nanorods electrospun from a solution mixture of titanium n-propoxide and poly(vinyl acetate) in dimethyl formamide. Investigation of the charge transport characteristics of this unique type of DSSC disclosed that the efficiency of the DSSCs was enhanced by optimizing the nanorod morphology to facilitate charge transport. Our TiO2 nanorods have an intrinsically higher sensitizer loading capability than conventional TiO2 nanoparticles and have much slower recombination lifetimes compared to conventional nanoparticles. Long electron lifetime in nanorod electrode contributes to the enhanced effective photocarrier collection as well as the conversion efficiency. The electron transport behavior of nanorod photoelectrodes was further improved by TiCl4 post-treatment. The post-treatment reduces the pore volume of nanorod photoelectrodes while improving inter-rod connectivity and enhancing electron diffusion. The electron diffusion coefficient of post-treated nanorod was similar to 51% higher than that of an untreated one, leading to a charge collection efficiency that was 19% higher at a incident photonflux of 8.1 x 10(16) cm(-2) s(-1). Finally, the efficiency of nanorod-based DSSCs was optimized at a photoelectrode thickness of 14 mu m to achieve 9.52% under masked illumination of simulated solar light, AM 1.5 Global (V-oc = 761 mV, J(sc) = 17.6 mA cm(-2), fill factor = 70.0%). English American Chemical Society Charge Transport Characteristics of High Efficiency Dye-Sensitized Solar Cells Based on Electrospun TiO2 Nanorod Photoelectrodes Article 10.1021/jp907855x 1 The Journal of Physical Chemistry C, v.113, no.51, pp.21453 - 21457 The Journal of Physical Chemistry C 113 51 21453 21457 N scie scopus 000272712700025 2-s2.0-73849104691 Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Chemistry Science & Technology - Other Topics Materials Science Article CONVERSION EFFICIENCY COLLECTION EFFICIENCY DIFFUSION LENGTH FILMS RECOMBINATION NANOWIRES ARRAYS LIGHT dye-sensitized solar cell electrospinning TiO2 nanorod electron transport