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학술지 ZnO Nanosphere Fabrication Using the Functionalized Polystyrene Nanoparticles for Dye-Sensitized Solar Cells
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정미희, 윤호경, 김상희, 강만구
Electrochimica Acta, v.55 no.22, pp.6563-6569
10MB4300, 투명전도성 기판 대체구조 태양전지 개발, 강만구
The nano-hollow spherical ZnO (NHS ZnO) photoelectrodes were prepared using functionalized polystyrene nanoparticles with flexible dimensional control of the particle diameter for dye-sensitized solar cells applications. NHS ZnO was formed by ZnO nanoparticles that accumulated on the surface of functionalized polystyrene with a high ionic strength. This method represents a one-step preparation method for an inorganic shell via polymerization between ZnO complexes. Even though NHS ZnO has a submicron size, it composed of nanoparticles that connect with each other, thereby implying good electron transfer properties, and has a high surface area. The submicron-sized diameter NHS ZnO has an enhanced light scattering capacity, which promotes the photons with more opportunities to be absorbed by the N719 dye molecules. Therefore, the ZnO films prepared from 600 nm to 1000 nm NHS ZnO possessed higher IPCE values over a wide range (from 400 nm to 750 nm) compared to films of the 300 nm ZnO due to the enhanced light scattering capacities of the film. In photocurrent-voltage measurements, the short-circuit current density of 300 nm and 600 nm NHS ZnO increases from 3.33 mA/cm2 to 6.53 mA/cm 2 while the cell efficiency increases from 1.04% to 3.02% due to the light scattering efficiency. Electrochemical impedance spectroscopy showed that electrons in NHS ZnO with a larger particle size have a longer electron lifetime than NHS ZnO with a smaller particle size, as the latter hinders the electron transport in the NHS ZnO nanostructured films. © 2010 Elsevier Ltd. All rights reserved.
KSP 제안 키워드
Cell Efficiency, Dimensional Control, Dye-sensitized solar cells(DSCs), Electron Transfer, Electron Transport, Electron lifetime, Functionalized polystyrene, High ionic strength, Impedance spectroscopy(IS), Light scattering efficiency, N719 dye