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Evaluation of Optical Properties of Dye-sensitized Solar Cell Incorporating Mesoscopic Interfacial Roughness

结合介观界面粗糙度的染料敏化太阳能电池的光学性能评估

基本信息

批准号：
16360312
负责人：
ISHIGURO Takashi
金额：
$ 9.47万
依托单位：
Nagaoka University of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16360312/
关键词：
solar energy mesoscopic structure solar cell dye-sensitized solar cell surface roughness solar energy conversion photo-catalyst nanostructure メゾスコッピク構造

项目摘要

Dye-sensitized solar cell (DSC) has usually a laminated structure. Optical energy loss due to the reflection at the interface is inevitable because of the difference in the intrinsic refractive index between mediums. The accumulation of these losses results in the considerable amount of the decrease of photo-electric conversion efficiency. In this study, the effect of mesoscopic interfacial rough-structure has been examined in a sense of optical impedance-matching due to the gradient-refractive index caused by the surface roughness.The structure concerned in a DSC is "air/ glass/ transparent conductive film (ITO electrode)/ dye adsorption TiO_2 film" and "Pt counter electrode". ITO and Pr films are prepared by the rf sputtering method. Optical properties of the specimens were measured using an ultraviolet-visible-near infrared spectrometer in the wavelength (λ) range of 0.24-2.60 μm. Surface morphology was observed using an atomic force microscope (AFM). Based on these observed data, the simulation of finite-difference time-domain (FDTD) method has been performed in a range of λ=0.4-1.0μm. The reductions of 3.6%, 0.5% and 0.5% in reflectance of respective roughened interfaces of air/ glass, glass/ ITO and ITO/ dye adsorption TiO_2 have been estimated. The roughened Pt film showed large diffusive reflectance.In this study, it has been confirmed that the suitable roughness is useful for the depression of reflectance at the interfaces in the DSC.

染料敏化太阳能电池(DSC)通常具有叠层结构。由于介质的本征折射率不同，界面反射引起的光能损失是不可避免的。这些损耗的累积导致了相当大的光电转换效率的下降。本研究从光学阻抗匹配的角度研究了介观界面粗糙结构的影响，DSC的结构是“空气/玻璃/透明导电膜(ITO电极)/染料吸附二氧化钛膜”和“铂对电极”。采用射频溅射方法制备了ITO和Pr薄膜。用紫外-可见-近红外光谱仪测量了样品在0.24-2.60μm波长范围内的光学性质，并用原子力显微镜观察了样品的表面形貌。基于这些观测数据，在λ=0.4-1.0μm的范围内进行了时域有限差分法模拟，估算了空气/玻璃、玻璃/ITO和ITO/染料吸附二氧化钛的粗糙界面的反射率分别降低了3.6%、0.5%和0.5%。在本研究中，适当的粗糙度有利于降低DSC中界面处的反射率。