Synthesis and characterization of novel poly(3-alkylthiophene)/TiO2 hybrid materials via in-situ sol-gel method.
Date Issued
2006
Date
2006
Author(s)
NGOH, TOH-XIN
DOI
en-US
Abstract
Polythiophene and titania are frequently used as good electron donor and electron acceptor in organic solar cells, respectively, due to their adequate energy levels and excellent charge transport properties. However, the compatibility between organic and inorganic materials is poor, thus usually leading to serious macro-scale phase separation upon blending. The main purpose of this thesis is to synthesize a hybrid material with minor phase separation.
In this thesis, both 2,5-dibromo-3-(6-bromohexyl)thiophene and 2,5-dibromo-3-hexylthiophene were first synthesized and employed as monomers to prepare poly[3-(6-bromohexyl)thiophene-co-3-hexylthiophene] with 1:4 monomers ratios via Grignard metathesis. The terminal bromine groups in copolymers were transferred to double bonds by the elimination reaction using t-BuOK as reagent. Then poly[3-(6-triethoxysilyl)thiophene-co-3-hexylthiophene] were synthesized by treating the alkene-containing copolymers with triethoxysilane in the presence of H2PtCl6 catalyst. Chemical structures and molecular weight characteristics of monomers and polymers as-prepared were analyzed by 1H-NMR and GPC. Then, under different relative humidity conditions, poly(3-hexylthiophene/TiO2 and poly[3-(6-triethoxysilyl)thiophene-co-3-hexylthiophene]/TiO2 bulk heterojunction hybrid materials were prepared by in-situ sol-gel reaction with varying amount of titanium(IV) isopropaoxide in dried chloroform. From SEM and AFM analysis, the phase separation of novel poly(3-alkylthiophene)/TiO2 nano-hybrid materials is reduced as compared to the poly(3-hexylthiophene)/TiO2 hybrid materials. Then, the photophysical properties of both hybrid materials were analyzed by using UV and PL. The integrating sphere is used to analysis and comparing both hybrid material quantum yields after excitation at specific wavelength.
Subjects
原位溶膠-凝膠方法
聚烷基噻
吩-二氧化鈦混成材料
太陽能電池
In-situ sol-gel method
poly(3-alkylthiophene)/TiO2 hybrid materials
solar cell
Type
thesis
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