標題: Alternating Copolymers Incorporating Cyclopenta[2,1-b:3,4-b ']dithiophene Unit and Organic Dyes for Photovoltaic Applications
作者: Cheng, Yen-Ju
Hung, Lung-Chang
Cao, Fong-Yi
Kao, Wei-Shun
Chang, Chih-Yu
Hsu, Chain-Shu
應用化學系
Department of Applied Chemistry
關鍵字: conjugated polymers;copolymerization;organic dyes;polycondensation;polymer solar cells
公開日期: 15-Apr-2011
摘要: We have synthesized six p-type copolymers, CPDT-co-TPADCN, CPDT-co-TPADTA, CPDT-co-TPATCN, CPDT-coDFADCN, CPDT-co-DFADTA, and CPDT-co-DFATCN, consisting of a cyclopenta[2,1-b:3,4-b']dithiophene (CPDT) unit and an organic dye in an alternating arrangement. Triphenylamine (TPA) or difluorenylphenyl amine (DFA) units serve as the electron donors, whereas dicyanovinyl (DCN), 1,3-diethyl-2-thiobarbituric acid, or tricyanovinyl (TCN) units act as the electron acceptors in the dyes. The target polymers were prepared via Stille coupling, followed by postfunctionalization to introduce the electron acceptors to the side chains. Because of the strongest withdrawing ability of TCN acceptor to induce efficient intramolecular charge transfer, CPDT-co-TPATCN and CPDT-co-DFATCN exhibit the broader absorption spectra covering from 400 to 900 nm and the narrower optical band gaps of 1.34 eV. However, the CPDT-co-TPATCN:PC(71)BM and CPDT-co-DFATCN:PC(71)BM based solar cells showed the power conversion efficiencies (PCEs) of 0.22 and 0.31%, respectively, due to the inefficient exciton dissociation. The DFA-based polymers possess deeper-lying HOMO energy levels than the TPA-based polymer analogues, leading to the higher V(oc) values and better efficiencies. The device based on CPDT-co-DFADTA:PC(71)BM blend achieved the best PCE of 1.38% with a V(oc) of 0.7 V, a J(sc) of 4.57 mA/cm(2), and a fill factor of 0.43. (C) 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 49:1791-1801, 2011
URI: http://dx.doi.org/10.1002/pola.24604
http://hdl.handle.net/11536/8996
ISSN: 0887-624X
DOI: 10.1002/pola.24604
期刊: JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
Volume: 49
Issue: 8
起始頁: 1791
結束頁: 1801
Appears in Collections:Articles


Files in This Item:

  1. 000288614000007.pdf