Charge and Energy Transfer in MEHPPV/TiO2 Hybrid Materials
Date Issued
2007
Date
2007
Author(s)
Lin, Yu-Ting
DOI
en-US
Abstract
In this thesis, optical properties of MEHPPV/TiO2 nanorods hybrid materials have been examined to realize the charge and energy transfer in MEHPPV/TiO2 nanorods hybrid materials. The photoluminescence quenching after blending TiO2 nanorods into the polymer matrix is observed at all excitation wavelengths. An interesting change in the quench rate occurs when the excitation wavelength is shorter than the absorption edge of TiO2 nanorods. Subsequently, the possible energy transfer from TiO2 nanorods to MEHPPV is proved by the low temperature PLE measurements and the frequency-domain lifetime spectroscopy. Furthermore, influences of chemical and physical modifications to the hybrid materials are discussed. We compare two different TiO2 nanorods, with and without the cover of a surfactant, in their charge and energy transfer abilities. Besides, thermal treatments change the property of polymer physically. The inclusion of TiO2 nanorods will hinder the re-stacking of polymer chains; thus, a smaller change in spectral feature is observed. We also discuss the size effect to the charge and energy transfer. In the end, preliminary electrical properties show the potential MEHPPV/TO2 nanorods hybrid materials for the photovoltaic application.
Subjects
二氧化鈦
太陽能電池
電荷轉移
能量轉移
MEHPPV
TiO2
solar cell
charge transfer
energy transfer
SDGs
Type
thesis
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