聚噻吩衍生物 (polythiophene derivatives) 近幾年引起了相當大的注意，由於其具有適當的電子能階和優良的電荷傳導能力，而經常被使用為高分子太陽能電池 (polymer solar cell) 中的電子供體(electron donor)，而今有許多研究都是將此材料經由物理混掺後形成高分子太陽能電池元件中之作用層 (active layer)。
本研究中我們首先使用Grignard coupling 和 bromination 合成 2,5-dibromo-3-hexylthiophene 單體；並利用 bromination 及Witting reaction製備了(Z)-2,5-dibromo-3-(4-bromostyryl)thiophene、(Z)-2,5-dibromo-3-styrylthiophene、(E) – 2 , 5 – dibromo – 3 - ( 4 – methoxystyryl ) thiophene 三種擁有苯乙烯基 (phenylenevinylene) 之共軛側鏈 (conjugated side-chain) 單體，接著利用 GRIM (Grignard metathesis method) 將上述三種共軛側鏈單體個別與 2,5-dibromo-3-hexylthiophene 依不同比例聚合。最後，藉由共軛側鏈末端 Br、H、OMe 三種官能基之共聚物比較其對光、電之物理及化學性質。透過核磁共振光譜儀 (1H-NMR) 進行產物之結構鑑定﹔紫外線-可見光吸收光譜儀 (UV-vis) 及光激螢光光譜儀 (PL) 測量及探討其吸收及放光行為於光譜上之變化；並且利用循環伏安法 (CV) 量測各種高分子產物之 HOMO 能階及計算其能隙差。

Polythiophene is frequently used as good electron donor in polymer solar cells, due to their adequate energy level and excellent charge transport properties. Therefore, polymer photovoltaic cells fabricated with it has been intensively studied.
In this study, we firstly synthesize the monomer of 2,5-dibromo-3-hexylthiophene in Grignard coupling and use the bromination、Witting reaction method to prepare the three monomers with phenylenevinylene conjugated side chain, which are (Z) – 2 , 5 – dibromo - 3 -(4-bromostyryl)thiophene、(Z)-2,5-dibromo-3-styrylthiophene、and (E)-2,5-dibromo-3-(4-methoxystyryl)thiophene. The monomers prepared beforehand consist phenylenevinylene conjugated side chain and monomer 2,5-dibromo-3-hexylthiophene were added together with various ratios via Grignard metathesis method to form copolymers. Finally, to compare the optical and electrochemical properties of the three teminal groups of bromide、hydride and methoxide, separately in conjugated side-chain conjugated polythiophenes.
By the nuclear magnetic resonance spectroscopy (1H-NMR) for structural characterization of the compounds ; To measure the UV - visible light absorption spectroscopy (UV-vis) and photoluminescence spectroscopy (PL) and then discuss its absorption and emission in the spectrum ; And I will take the cyclic voltammetry (CV) to measure all of the polymers which HOMO energy level and calculate the energy gap respectively.

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