Combining light harvesting and electron transfer in silica-titania-based organic-inorganic hybrid materials.
A convenient protocol to fabricate an organic-inorganic hybrid system with covalently bound light-harvesting chromophores (stilbene and terphenylene-divinylene) and an electron acceptor (titanium oxide) is described. Efficient energy- and electron-transfer processes may take place in these systems. Covalent bonding between the acceptor chromophores and the titania/silica matrix would be important for electron transfer, whereas fluorescence resonant energy transfer (FRET) would strongly depend on the ratio of donor to acceptor chromophores. Time-resolved spectroscopy was employed to elucidate the detailed photophysical processes. The coupling of FRET and electron transfer was shown to work coherently to lead to photocurrent enhancement. The photocurrent responses reached a maximum when the hybrid-material thin film contained 60 % acceptor and 40 % donor.
Lin
Cheng-Lan
CL
Departments of Chemistry, National Taiwan University, Taipei 106, Taiwan, Fax: (+886) 2-2364-4971.
Chen
Chih-Hsien
CH
Departments of Chemistry, National Taiwan University, Taipei 106, Taiwan, Fax: (+886) 2-2364-4971.
Lim
Tsong-Shin
TS
Department of Physics, Tung Hai University, Taichung 407, Taiwan.
Fann
Wunshain
W
Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 106, Taiwan.
Luh
Tien-Yau
TY
Departments of Chemistry, National Taiwan University, Taipei 106, Taiwan, Fax: (+886) 2-2364-4971.