%0 Journal Article
%@ 02555476
%A Mohamed, N.M.
%A Zaine, S.N.A.
%C Bandung
%D 2013
%F scholars:4036
%I Trans Tech Publications Ltd
%J Materials Science Forum
%K Calcination; Chemisorption; Conversion efficiency; Dye-sensitized solar cells; Efficiency; Ethanol; Hydrolysis; Light scattering; Nanocrystallites; Nanocrystals; Physicochemical properties; Scattering; Spheres; Titanium dioxide; Ultraviolet visible spectroscopy; Water absorption, Absorption intensity; Calcination temperature; Hydrolysis process; Internal surface area; Scattering effects; Simulated sunlight; Spherical aggregates; UV-vis spectroscopy, Aggregates
%P 137-144
%R 10.4028/www.scientific.net/MSF.737.137
%T Performance of TiO2 aggregates-based dye solar cells
%U https://khub.utp.edu.my/scholars/4036/
%V 737
%X TiO2aggregates-based dye solar cells (DSCs) have gained an increasing interest due to their better light harvesting efficiency as a result of enhanced light scattering effect from the submicron spherical aggregates that can generate more electrons and the high internal surface area for dye chemisorption provided by nanocrystallites which made up the aggregates. Optimized TiO2aggregates (0.45 μm) composing of nanocrystallites (10-40 nm) with desired physicochemical properties for enhanced overall light conversion efficiency of DSC were synthesized by varying the calcination temperature and water content in the hydrolysis of titanium alkoxide in ethanol. TiO2aggregates obtained were characterized using FESEM, XRD and UV-Vis spectroscopy. The assembled DSCs were then evaluated using solar simulator under AM 1.5 (100 mW/cm2) simulated sunlight. Nanocrystallites were found to have an increasing size of 12 nm to 36 nm with increasing calcination temperature of 400°C to 600°C. Sample of aggregates calcined at 500°C recorded the highest efficiency (4.456) as the 20-nm nanocrystallites produced is considered to be the optimum size for dye absorption. With higher water content in the hydrolysis process, the aggregates lose their spherical shapes resulting in lower absorption intensity indicating the occurrence of low light scattering in the TiO2film. Highest conversion efficiency was observed for DSC that used welldefined spherical TiO2aggregates composing of 20-nm nanocrystallites which were synthesized using ethanol with low water content (0.9 vol) followed by calcination at 500°C. Thus, optimized TiO2nanocrystallites which form spherical aggregate is critical in order to improve light harvesting efficiency of DSCs. © (2013) Trans Tech Publications, Switzerland.
%Z cited By 4; Conference of Symposium on Nanotechnology Applications in Energy and Environment 2012, NAEE 2012 ; Conference Date: 20 September 2012 Through 21 September 2012; Conference Code:95673