量子点敏化电池光阳极的自敏化及其光电性能研究

发布时间：2018-02-14 19:57

本文关键词： 量子点敏化电池二氧化钛光阳极自敏化硫化镉电池效率　出处：《电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着纳米技术的不断发展,无机半导体量子点受到人们的广泛关注,已成为热点;量子点太阳能电池伴随着这样的机会逐渐进入人们的视野,并越来越受到关注。量子点敏化电池在染料敏化电池的基础上采用量子点作为敏化剂而成的电池,它弥补了染料敏化电池中染料的吸光范围窄、吸光系数偏低等不足;其量子效应在理论上可以电池效率达到66%,具有很大的前景。但就目前来说,量子点敏化电池的实际效率远远没有达到人们的要求,人们对提高量子点敏化电池效率进行了各方面的研究。TiO2作为常见的光阳极材料,其禁带宽度为Eg=3.42eV,只能吸收少量的紫外线。本课题就是针对量子点敏化电池的光阳极TiO2进行优化使其禁带宽度变窄、光谱相应范围更宽、能级分布更合理。将TiO2多孔薄膜在高温下通入氢气对其进行优化,形成H:TiO2达到调节光阳极的能级分布,增强光谱响应范围的目的,并提出了“自敏化”的概念:H:TiO2与电解液和对电极(无需添加敏化剂)组装成自敏化电池,成功测出光电转换效率为0.015%,从而实现H:TiO2的自我敏化。CdS的禁带宽度Eg=2.42eV,其禁带宽度和带隙能较为适中,在可见光范围内光吸收良好而且电子复合率也较低;是最为常见的无机量子点敏化剂。相对于CdSe,其导带能级的位置更高,光生电子向TiO2导带注入能力更强,能够实现光生电子-空穴的有效分离更快。将氢化处理好的H:TiO2光阳极进一步复合CdS量子点组装成双敏化电池,改变CdS量子点的吸附量最终得到最高光电转换效率为2.0%。
[Abstract]:With the development of nanotechnology, inorganic semiconductor quantum dots have been paid more and more attention. Quantum dot sensitized battery is based on dye sensitized battery, which uses quantum dot as sensitizer, which makes up for the shortage of narrow absorption range and low absorptivity of dye in dye sensitized battery. The quantum effect can reach 66 percent efficiency in theory, which has great prospect. But at present, the actual efficiency of quantum dot sensitized battery is far from what people require. Improving the efficiency of Quantum Dot sensitized cells has been studied in all aspects. TiO2 is a common photoanode material. Its bandgap is 3.42eV, and it can only absorb a small amount of ultraviolet rays. In this paper, we optimize the photoanode TiO2 of quantum dot-sensitized battery to narrow the forbidden band width and widen the corresponding spectrum range. The energy level distribution is more reasonable. By optimizing the TiO2 porous film with hydrogen at high temperature, the energy level distribution of the photoanode can be adjusted by H _ 2O _ 2, and the spectral response range can be enhanced. The concept of "self-sensitizing" is proposed. The concept of "self-sensitizing" is proposed. The cell is assembled with electrolyte and counter electrode (without adding sensitizer) to form a self-sensitized battery. The photoelectric conversion efficiency is 0.015, thus realizing the self-sensitization of H: TiO2. CDs' bandgap is 2.42 EV, its band gap and band gap energy are moderate, the light absorption is good and the electron recombination rate is low in the visible light range. It is the most common inorganic quantum dot sensitizer. Compared with CdSes, the position of conduction band level is higher, and the photoelectron injection ability into TiO2 conduction band is stronger. The hydrogenated H: TiO2 photoanode is further composed of CdS quantum dots to form a double sensitized cell, and the maximum photoelectric conversion efficiency is 2.0 by changing the adsorption capacity of CdS quantum dots.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM914.4

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