含三苯胺側鏈之二維電子施體與受體導電高分子合成、特性與光電性質研究

Abstract

在本篇碩士論文中，我們成功的設計與合成出在共軛主鏈上以qninoxaline為受體和thiophene為施體交替鏈結，再從主鏈上的受體串接共軛支鏈的三苯胺施體(triphenylamine, TPA)，使其形成一個二維的施體-受體共軛高分子。其中三苯胺為良好的電洞的傳導材料。我們也利用製備級幫浦及製備級凝膠滲透層析管柱，將PTQT依照分子量大小不同加以分離，可以得到不同分子量且分子量分佈較狹小的高分子。由紫外-可見光吸收光譜可以看到高分子隨著分子量的增加(數量平均分子量:從5000到83000)在可見光區的最大吸收峰有著明顯的紅移的趨勢。藉由對PTQT進行循環伏安法的測量，其最高佔有分子軌域能階值大約在-5.25eV。PTQT擁有不錯的熱穩定性，其熱裂解溫度大約都在400℃以上。經由台灣大學凝態科學研究中心王立義老師的指導，且由本實驗室李育凭學長利用PTQT/PCBM混成系統製作的太陽能電池有著不錯的開路電壓(約0.79 V)及電力轉換效率可達0.82 %。

In this master thesis work, we designed and synthesized a novel two-dimensional donor-acceptor (D-A) conjugated polymer PTQT which containing electron-withdrawing subunit quinoxaline as acceptor core and electron-donating triphenylamine (TPA) in side chain and thiophene in main chain as donor groups. Due to TPA-based materials are widely known as excellent hole-transporters. We have used preparative gel permeation chromatography (prep. GPC) to prepare PTQTs of various molecular weights with narrow polydispersity (PDI). From the UV-vis spectra of PTQT, a bathochromic effect of their absorption maximum at visible region translate from 561 to 616 nm with increasing chain length (Mn: from 5000 to 83000). PTQT is electrochemically active in oxidation and the cyclic voltammetry measurement shows that the HOMO energy level of PTQT is located at -5.25 eV. The TGA analysis of PTQT and PTQTs show good thermal stability that is higher than 400 ℃. Polymer solar cell fabricated by using PTQT/PCBM blend system shows a high open-circuit voltage ~0.79 V and a power conversion efficiency (PCE) up to 0.82 % under AM 1.5 simulated sun light (100 mW/cm2).