含共價結合給受體螢光染色基團之溶膠合成與光物理及光電池之研究

Photophysics and Light-Induced Current Generation in Organic-Inorganic Hybrid Materials Incorporated with Donor-Acceptor Chromophores

劉耕硯(Ken-Yen Liu)

指導教授 ： 陸天堯

共同指導教授 ： 劉陵崗(Ling-Kang Liu)

國立臺灣大學/理學院/化學研究所/碩士(2004年)

https://doi.org/10.6342/NTU.2004.00223

摘要

摘要

近年來科學家對於利用人工合成之系統模仿自然界的光收成及能量轉移抱持著很大的興趣。 在此篇論文中報導了利用含有雙矽氧烷基之共軛基團當作給受體，並且和四乙氧基矽烷用溶膠凝膠法形成含二到四種發光團之單相均勻有機無機混成材料，能藉由給受體間的能量轉移，進而表現出光收成的效果。當只有一種發光團時，會因為分子之間的堆疊造成自生淬息及螢光紅移的現象(跟單體之螢光光譜比較)，而加入另一發光團時便可將原發光團隔開而減低堆疊的產生。 而隨著給體比例升高而增強的受體螢光強度，則證明了光收成的現象。這些結果和大自然的光收成現象相吻合。另外，在三種及四種發光團的系統裡，我們也能觀察到能量轉移的發生。
這樣的有機無機混成材料也具有光電流的性質。使用二氧化鈦當作有效的電子受體，在加入四異丙氧基鈦烷一起形成有機-矽-鈦混成材料後，得到較大的光電流。製成Grätzel型電池元件，得到近1%的效率。

關鍵字

光電流 ； 發光團 ； 能量轉移 ； 溶膠凝膠法 ； 光收成

並列摘要

Abstract

There have been ever burgeoning interests on synthetic light harvesting systems to effectively mimic the natural process of energy transfer. In this thesis, different kinds of bis[(alkox)silane] moieties with different aromatic cores as donor and acceptor were empolyed. The organic-inorganic hybrids silica containing a combination of two to four kinds of chromophores were prepared by the sol-gel technique. When the hybrid material contained only one kind of the chromophore, self-quenching leading to red shift in the emission spectra in comparison with those of monomeric compounds measured in solution (aggregation may occur). Incorporation of a second chromophore into the system may segregate such kind of aggregation so that self-quenching might be avoided. The higher the donor concentration, the higher the emission intensity. These results are consistent with the light harvesting nature of our hybrid materials. Energy transfer can also occur in the hybrid material contained three and four kind of the chromophores.
Furthermore, such system can show light-induced current generation property. Titanium oxide has been demonstrated to serve as an efficient electron acceptor in this system. When the hybrid material was prepared from TTIP and TEOS, a further enhancement of the photocurrent was obtained. The hybrid systems were used to fabricate Grätzel cells, and the efficiency reached around 1%。

並列關鍵字

light-induced current ； chromophore ； sol-gel technique ； energy transfer ； light harvesting

參考文獻

(1) Stewart, G. M.; Fox, M. A. J. Am. Chem. Soc. 1996, 118, 4354-4360.

(2) Devadoss, P.; Moore, J. S. J. Am. Chem. Soc. 1996, 118, 9635-9644.

(13) Gust, D.; Moore, T. A.; Moore, A. L. Acc. Chem. Res. 2001, 34, 40-48.

(14) Choi, M.-S.; Aida, T.; Yamazaki, T.; Yamazaki, I. Chem. Eur. J. 2002, 8, 2667-2678.

(16) Nowakowska, M.; Foyle, P. V.; Guillet, J. E. J. Am. Chem. Soc. 1993, 115, 5975-5981.