Structural, optical and photoelectrochemical studies on the nanodispersed titania

Title
Structural, optical and photoelectrochemical studies on the nanodispersed titania
Authors
이기원방소연이채현김원목김동환김경곤박남규
Keywords
Dye-sensitized solar cell; Nanodispersion; Aggregation; Microbead milling; Haze
Issue Date
2009-09
Publisher
Current applied physics : the official journal of the Korean Physical Society
Citation
VOL 9, 900-906
Abstract
Nanodispersion of aggregated TiO2 powders has been performed by microbead milling and its effect on photovoltaic performance has been investigated with dye-sensitized solar cell. Plasma-treated 30 lmdiameter zirconia beads are used to disperse the aggregated nanocrystalline TiO2 powders in ethanolic medium. Particle size distribution, surface area, film morphology, porosity, transmittance and haze are investigated with different milling speed. Microbead milling leads to a reduction of particle size, narrow size distribution and increase of surface area. A slight crystal phase transformation from anatase to rutile is also observed after microbead milling. Optical property is found to be influenced by microbead milling speed, where transmittance increases and haze decreases with increasing milling speed. Compared with photovoltaic performance of dye-sensitized solar cells based on titania before and after microbead milling, overall conversion efficiency is substantially improved from 4.46% to 6.31% after microbead milling at 2490 rpm for 90 min, corresponding to 42% increment, which is mainly due to a noticeable increase in photocurrent density, associated with highly dispersed characteristics. According to the photocurrent and photovoltage transient spectroscopic study, time constant for electron transport is hardly affected, while that for recombination is slightly decreased due to the increased surface area by nanodispersion.
URI
http://pubs.kist.re.kr/handle/201004/35698
ISSN
1567-1739
Appears in Collections:
KIST Publication > Article
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