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标题：Electron Tunneling, Performance Analysis and Prospect of Micro-energy Generation in Ringwood (Syzygium Anisatum) Dye-sensitized Solar Cell
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作者：T. J. Abodunrin ; O. O. Ajayi ; M. E. Emetere 等
期刊名称：Lecture Notes in Engineering and Computer Science
印刷版ISSN：2078-0958
电子版ISSN：2078-0966
出版年度：2019
卷号：2239
页码：322-325
出版社：Newswood and International Association of Engineers
摘要：Energy continues to be the currency that drives all technology. Thus, the quest for energy remains vital to energy sustainability. In the wake of several adverse consequences of indiscriminate combustion of fossil fuel, there is an urgency to exploit our natural environment for ecologically benign alternatives. Ringwood also known as S. anisatum or Aniseed is a common sight in many ornamental gardens. It provides the customary thick layer of plush greenery typical of such settings. In addition, its characteristic aromatic leaves are capable of attaining a height of 45 metres. These attributes consolidated in the choice of Ringwood as a suitable candidate with a rich and viable store of solar energy. This gave the impetus to convert this S.anisatum store of photons of sunlight to electricity. Preliminary phytochemical screening results revealed the presence of phenols, flavonoids, tannins, glycosides, terpenoids and protein, a wide chromophore selection for charge transport. The study of S.anisatum absorbance-wavelength properties with UV/VIS spectroscopy shows S.anisatum dye extract having multiple peak absorbances with its optimum in the near ultraviolet region although, it absorbs optimally in the visible region of the electromagnetic spectrum. This is a Porphyrin dye characteristic, a desirable attribute that facilitates wider spectrum of solar energy absorption. The output photovoltaic performance of S.anisatum dyesensitized solar cells revealed a short circuit current of 0.07 mA, fill factor value of 0.84 and the output efficiency was 0.027 % using KBr electrolyte. This is a comparatively good result considering previous records of dye-sensitized solar cell photovoltaic performance. The significance of these results from molecular perspective was explored with the aid of scanning electron microscopy (SEM). A need to boost the efficiency necessitated the interpretation of SEM micrographs with Gwwydion software. The presentation of possible areas for charge transport within the electron shells of S.anisatum dye nanocomposite, and regions where tunneling occurs provided a much needed insight for future studies. Consequently, this study is very instrumental in understanding the dual effect of charge transport/tunneling on output performance of dye-sensitized solar cell technology. The application is particularly relevant in modelling, photovoltaic simulations and energy efficiency models.
关键词：bandgap; energy efficiency; energy harvesting; electron tunneling