Synthesis and Controlled Self-Assembly of End-Capped Modified Poly(3-hexylthiophene) and Their Application in Organic Solar Cell

• Main Authors: Yun-Chen Wu, 吳昀錚
• Other Authors: Chain-Shu Hsu
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/86128428263476719462

碩士 === 國立交通大學 === 應用化學系所 === 96 === Organic Photovoltaics (OPVs) have several advantages such as flexible, easy fabrication and low cost. The goal of this research is to study the synthesis and application of new poly(3-hexylthiophene) derivatives. The first part of this study is to incorporate poly(3-hexylthiophene) (P3HT) into copolymer structure with poly(l-lactide) (PLLA) blocks via a feasible Grignard metathesis method to control the end-capping group, and ring-opening polymerization method to combine the l-lactide monomer. Different volume fractions of P3HT-PLLA were prepared with different molecular weight of PLLA. The chemical structure of the copolymers were investigated by 1HNMR and MALDI-TOF MS. Well-defined and phase-separated microdomains of P3HT-PLLA thin film can be observed by appropriate solvents and post-thermal treatment. The block copolymer films reveal pit-like surface morphology. After degradation of PLLA block, the films with large amounts of porous texture were formed and used as templates for the fabrication of organic solar cells. The OPV devices with P3HT nanoporous film show higher power conversion efficiency than that with pristine P3HT thin film. The second part of this study, we combined vinyl terminated poly(3-hexylthiophene) with 1,3,5,7,9,11,13,15-Octakis(dimethylsilyloxy)- pentacyclo[9.5.1.13,9.15,15.17,13]octasiloxane to synthesized new star-like P3HT polymer. This star-like polymer shows better film forming property and better device stability than the original vinyl-terminated P3HT.