Department of Physical Sciences and Technology, Sabaragamuwa University of Sri Lanka, Belihuloya, Sri Lanka.
Spectrochim Acta A Mol Biomol Spectrosc. 2013 May 15;109:37-41. doi: 10.1016/j.saa.2013.02.016. Epub 2013 Feb 21.
In this paper, the performance of nano-porous electrodes made of a composite material of SrTiO3 and SnO2 are compared with those made of bare SnO2. When these particular devices are analyzed in a comparative mode the results confirmed the enhancement of photovoltaic parameters in the former device. The performance of respective cells were examined by several methods including I-V characteristic measurements, photocurrent action spectra, dark I-V measurements, Mott-Schottky measurements and X-ray diffraction measurements. Even though such improvements in this particular cell could be explicated by the formation of a potential energy barrier of SrTiO3 particles of comparably large width at the SrTiO3/SnO2 interface, the passivation of voids in the SnO2 film by SrTiO3 particles to a certain extent could not be totally ruled out. Besides, high energetic electrons injected by dye molecules move more credibly through mini-bands formed in the chain of nano-crystalline SnO2 particles to the back contact. The blocking of the recombination path and the shifting up of the uppermost electron occupied level of SnO2 accompanying the conduction band edge in the SrTiO3/SnO2 composite film, may have lead to the observed enhancement of the fill factor and photovoltage, respectively.
本文比较了由 SrTiO3 和 SnO2 复合材料制成的纳米多孔电极与纯 SnO2 制成的纳米多孔电极的性能。当以比较模式分析这些特殊器件时，结果证实了前一种器件中光伏参数的增强。通过几种方法检查了各个电池的性能，包括 I-V 特性测量、光电流作用光谱、暗 I-V 测量、Mott-Schottky 测量和 X 射线衍射测量。尽管这种特殊电池的性能可以通过 SrTiO3 颗粒在 SrTiO3/SnO2 界面处形成比较大宽度的势能垒来解释，但 SrTiO3 颗粒对 SnO2 薄膜中的空隙的钝化在一定程度上不能完全排除。此外，由染料分子注入的高能电子更可信地通过纳米晶 SnO2 颗粒链中形成的微带移动到背接触。在 SrTiO3/SnO2 复合膜中，伴随导带边缘的 SnO2 的最高占据电子能级的上移和复合路径的阻断，可能导致观察到的填充因子和光电压的增强。
