合成予體–受體型高分子含噻吩并[3,4-c]吡咯-4 ,6 -二酮之性質分析及其太陽能電池之研究

Abstract

本論文以拉電子基團thieno[3,4-c]pyrrole-4,6-dione（TPD）為受體，與平面性良好之推電子基團3,6-dioctylthieno[3,2-b]thiophene（TT）為予體，合成出具有結晶性之共軛高分子PTTTPD，同時也與4-(heptadecan-9-yl)-4H-dithieno[3,2-b:2',3'-d]pyrrole（DTP），合成具有低光學能隙之共軛高分子PDTPTPD。 此外，為降低立體障礙，在TT與TPD單體間和DTP與TPD單體間插入噻吩做為spacer，合成出PDTTTPD、PDTPDTTPD。 PTTTPD、PDTTTPD具有高結晶性，高熱穩定度，PTTTPD高分子與PCBM混摻製成塊狀異質介面太陽能元件，其光電轉換效率為0.25 %。將PDTTTPD高分子與PC71BM混摻後，同時再加入添加劑1 % DIO，製成塊狀異質介面太陽能電池元件，具良好之元件特性，效率可達5.1 %，Voc可達0.86 V。 PDTPTPD、PDTPDTTPD則具低光學能隙及高熱穩定性質，將此兩高分子分別與PCBM混摻製成塊狀異質介面太陽能電池元件，其能量轉換效率為1.86 %與0.76 %，PDTPDTTPD加入1% DIO添加劑後，有些許的提升至1.16 %。

In this thesis, we have synthesized a conjugated polymer containing electron-withdrawing thieno[3,4-c]pyrrole-4,6-dione (TPD) and electron-donating thieno[3,4-c]pyrrole-4,6-dione units (TT), PTTTPD. We also synthesized TPD based low band-gap polymers conatining electron-donating 4-(heptadecan-9-yl)-4H-dithieno[3,2-b:2',3'-d] pyrrole (DTP), PDTPTPD. Besides, we also intrduced the thiophene as the spacer between donor and acceptor, and then we synthesized PDTTTPD and PDTPDTTPD. The PTTTPD and PDTTTPD exhibited high crystalline characteristics and excellent thermal properties. Bulk heterojunction (BHJ) photovoltaic devices of PDTTTPD incorporating [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) and 1% DIO, than it displayed high power conversion efficiency (PCE) of 5.1 %. But the devices of PTTTPD didn’t, it just only 0.25 %. Moreover, both of PDTPTPD and PDTPDTTPD exhibited low band-gap properties and excellent thermal properties. BHJ photovoltaic devices of PDTPTPD and PDTPDTTPD incorporating PCBM and they displayed PCEs of 1.86 % and 0.76 %, respectively. Furthermore, when the devices of PDTPDTTPD incorporating with small amount of additives into these blends, the PCE of PDTPDTTPD were enhanced to 1.16 %.