Synthesis and characterization of fluorene-based low-band gap copolymers containing propylenedioxythiophene and benzothiadiazole derivatives for bulk heterojunction photovoltaic cell applications

Autor: In Ae Shin, Myungjin Lee, Tae In Ryu, Gi-Dong Lee, Jin Su Park, Sung-Ho Jin, Kyung-Jin Yoon, Myungkwan Song, Jae Wook Lee, Yeong-Soon Gal
Rok vydání: 2008
Předmět:
Zdroj: Journal of Polymer Science Part A: Polymer Chemistry. 46:6175-6184
ISSN: 1099-0518
0887-624X
DOI: 10.1002/pola.22928
Popis: The following noble series of soluble π-conjugated statistical copolymers was synthesized by palladium catalyzed Suzuki polymerization: poly[(9,9-dioctylfluorene)-alt-(4,7-bis(3′,3′-dihepyl-3,4-propylenedioxythienyl)-2,1,3-benzothiadiazole)] (PFO-PTBT) derived from poly(9,9-dioctylfluorene) (PFO) and poly[(4,7-bis(3′,3′-dihepyl-3,4-propylenedioxythienyl)-2,1,3-benzothiadiazole)] poly(heptyl4-PTBT). The structure and properties of these polymers were characterized using 1H-, 13C-NMR, UV–visible spectroscopy, elemental analysis, GPC, DSC, TGA, photoluminescence (PL), and cyclic voltammetry (CV). The statistical copolymers, PFO-PTBT (9:1, 8.4:1.6, 6.5:3.5), were soluble in common organic solvents and easily spin coated onto indium-tin oxide (ITO) coated glass substrates. The weight-average molecular weight (Mw) and polydispersity of the PFO-PTBT ranged from (1.0–4.2) × 104 and 1.5–2.3, respectively. Bulk heterojunction photovoltaic cells with an ITO/PEDOT/PFO-PTBT:PCBM/LiF/Al configuration were fabricated, and the devices using PFOPTBT (6.5:3.5) showed the best performance compared with those using PFO-PTBT (9:1, 8.4:1.6). A maximum power conversion efficiency (PCE) of 0.50% (Voc = 0.66 V, FF = 0.29) was achieved with PFO-PTBT (6.5:3.5). © 2008 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 46: 6175–6184, 2008
Databáze: OpenAIRE
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