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Electronic structures of two types of TiO2 electrodes: inverse opal and nanoparticulate cases

机译：两种类型的TiO2电极的电子结构：反蛋白石和纳米颗粒情况

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摘要

We present a comparison between the electronic structures of inverse opal (IO) and nanoparticulate (NP)-TiO2 electrodes. The electronic structure details were obtained from optical absorption, fluorescence, and valence band studies in order to clarify the nature of the higher photovoltaic performance observed in sensitized solar cells using IO-TiO2 electrodes. We used photoacoustic (PA) and photoluminescence (PL) spectroscopy to characterize the optical absorption and fluorescence properties, respectively. Photoelectron yield (PY) spectroscopy was applied to characterize the position of the valence band maximum (VBM) of the IO- and NP-TiO2 electrodes. The PA spectrum for IO-TiO2 is different to that for NP-TiO2, indicating differences in the exciton-phonon interactions and the density of states in the conduction band. PL measurements showed that the curvature of the valence band structure of IO-TiO2 is different to that of NP-TiO2. Also, PL measurements showed that the oxygen vacancy in IO-TiO2 is different to that in NP-TiO2. Moreover, PY measurements showed VBM in IO-TiO2 to be at a higher position than that in NP-TiO2, suggesting a correlation with the increased open circuit voltage (V-oc) in sensitized solar cells.
机译：我们提出了反蛋白石（IO）和纳米颗粒（NP）-TiO2电极的电子结构之间的比较。从光学吸收，荧光和价带研究中获得了电子结构的详细信息，以阐明使用IO-TiO2电极在敏化太阳能电池中观察到的更高光伏性能的性质。我们分别使用光声（PA）和光致发光（PL）光谱来表征光吸收和荧光性质。应用光电子产率（PY）光谱来表征IO-和NP-TiO2电极的价带最大值（VBM）的位置。 IO-TiO2的PA光谱不同于NP-TiO2的PA光谱，表明激子-声子相互作用和导带中的态密度不同。 PL测量表明，IO-TiO2的价带结构的曲率与NP-TiO2的价带结构的曲率不同。另外，PL测量表明，IO-TiO2中的氧空位与NP-TiO2中的氧空位不同。此外，PY测量显示，IO-TiO2中的VBM处于比NP-TiO2中更高的位置，这表明与敏化太阳能电池中增加的开路电压（V-oc）相关。

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