發(fā)布時(shí)間：2018-02-14 19:57

  本文關(guān)鍵詞： 量子點(diǎn)敏化電池 二氧化鈦光陽極 自敏化 硫化鎘 電池效率　出處：《電子科技大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著納米技術(shù)的不斷發(fā)展,無機(jī)半導(dǎo)體量子點(diǎn)受到人們的廣泛關(guān)注,已成為熱點(diǎn);量子點(diǎn)太陽能電池伴隨著這樣的機(jī)會(huì)逐漸進(jìn)入人們的視野,并越來越受到關(guān)注。量子點(diǎn)敏化電池在染料敏化電池的基礎(chǔ)上采用量子點(diǎn)作為敏化劑而成的電池,它彌補(bǔ)了染料敏化電池中染料的吸光范圍窄、吸光系數(shù)偏低等不足;其量子效應(yīng)在理論上可以電池效率達(dá)到66%,具有很大的前景。但就目前來說,量子點(diǎn)敏化電池的實(shí)際效率遠(yuǎn)遠(yuǎn)沒有達(dá)到人們的要求,人們對(duì)提高量子點(diǎn)敏化電池效率進(jìn)行了各方面的研究。TiO2作為常見的光陽極材料,其禁帶寬度為Eg=3.42eV,只能吸收少量的紫外線。本課題就是針對(duì)量子點(diǎn)敏化電池的光陽極TiO2進(jìn)行優(yōu)化使其禁帶寬度變窄、光譜相應(yīng)范圍更寬、能級(jí)分布更合理。將TiO2多孔薄膜在高溫下通入氫氣對(duì)其進(jìn)行優(yōu)化,形成H:TiO2達(dá)到調(diào)節(jié)光陽極的能級(jí)分布,增強(qiáng)光譜響應(yīng)范圍的目的,并提出了“自敏化”的概念:H:TiO2與電解液和對(duì)電極(無需添加敏化劑)組裝成自敏化電池,成功測出光電轉(zhuǎn)換效率為0.015%,從而實(shí)現(xiàn)H:TiO2的自我敏化。CdS的禁帶寬度Eg=2.42eV,其禁帶寬度和帶隙能較為適中,在可見光范圍內(nèi)光吸收良好而且電子復(fù)合率也較低;是最為常見的無機(jī)量子點(diǎn)敏化劑。相對(duì)于CdSe,其導(dǎo)帶能級(jí)的位置更高,光生電子向TiO2導(dǎo)帶注入能力更強(qiáng),能夠?qū)崿F(xiàn)光生電子-空穴的有效分離更快。將氫化處理好的H:TiO2光陽極進(jìn)一步復(fù)合CdS量子點(diǎn)組裝成雙敏化電池,改變CdS量子點(diǎn)的吸附量最終得到最高光電轉(zhuǎn)換效率為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.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM914.4

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