Synthesis and Characterization of Thieno[3,4-c]pyrrole-4,6-dione Based Donor–Acceptor Conjugated Polymers for Bulk Heterojunction Solar Cells

• Main Authors: Liu, Shi-Bin, 劉士彬
• Other Authors: Wei, Kung-Hwa
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/01333306563416347521

碩士 === 國立交通大學 === 材料科學與工程學系 === 99 === In this thesis, a series of donor-acceptor (D–A) conjugated polymers, PBTTPDs, containing electron-withdrawing thieno[3,4-c]pyrrole-4,6-dione (TPD) and electron-donating bi(alkyl)thiophene units were synthesized. We also prepared two TPD based low band-gap polymers, PCPDTTPD and PDTSTPD, conatining electron-donating cyclopenta[2,1-b;3,4-b′]dithiophene (CPDT) and dithieno[3,2-b:2′,3′-d]silole (DTS) units. The PBTTPD based polymers exhibit high crystalline characteristics, low-lying HOMO energy level, and excellent thermal properties. Bulk heterojunction (BHJ) photovoltaic devices incorporating these polymers/ [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) blend displayed good photovoltaic properties. Especially, the PBTTPD1 based device displayed a high power conversion efficiency (PCE) of 4.7%. Moreover, both of PCPDTTPD and PDTSTPD exhibit low band-gap properties (1.74 and 1.69 eV, respectively) and excellent thermal properties. BHJ photovoltaic devices incorporating PCPDTTPD/[6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) and PDTSTPD/PC71BM blends displayed PCEs of 1.0% and 1.6%, respectively. Furthermore, when incorporating small amount of additives into these blends, their PCEs of devices were enhanced to 3.1% and 2.7%, individually, because of their smoother and more homogeneous morphology of the blend.