Photophysics and Light-Induced Current Generation in Organic-Inorganic Hybrid Materials Incorporated with Donor-Acceptor Chromophores
Date Issued
2004
Date
2004
Author(s)
Liu, Ken-Yen
DOI
zh-TW
Abstract
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%。
Subjects
光電流
發光團
能量轉移
溶膠凝膠法
光收成
light-induced current
chromophore
sol-gel technique
energy transfer
light harvesting
Type
thesis
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