標題: A Supramolecular "Double-Cable" Structure with a 129(44) Helix in a Columnar Porphyrin-C-60 Dyad and its Application in Polymer Solar Cells
作者: Wang, Chien-Lung
Zhang, Wen-Bin
Sun, Hao-Jan
Van Horn, Ryan M.
Kulkarni, Rahul R.
Tsai, Chi-Chun
Hsu, Chain-Shu
Lotz, Bernard
Gong, Xiong
Cheng, Stephen Z. D.
應用化學系
Department of Applied Chemistry
關鍵字: fullerenes;hierarchical structures;self-assembly;solar cells;supramolecular materials
公開日期: 1-十一月-2012
摘要: A novel porphyrin-C-60 dyad (PCD1) is designed and synthesized to investigate and manipulate the supramolecular structure where geometrically isotropic [such as [60]fullerene (C-60)] and anisotropic [such as porphyrin (Por)] units coexist. It is observed that PCD1 possesses an enantiomeric phase behavior. The melting temperature of the stable PCD1 thermotropic phase is 160 degrees C with a latent heat (Delta H) of 18.5 kJ mol(-1). The phase formation is majorly driven by the cooperative intermolecular PorPor and C60C60 interactions. Structural analysis reveals that this stable phase possesses a supramolecular double-cable structure with one p-type Por core columnar channel and three helical n-type C-60 peripheral channels. These double-cable columns further pack into a hexagonal lattice with a = b = 4.65 nm, c = 41.3 nm, alpha = beta = 90 degrees and gamma = 120 degrees. The column repeat unit is determined to possess a 129(44) helix. With both donor (D; Pro) and acceptor (A; C-60) units having their own connecting channels as well as the large D/A interface within the supramoleculassr double-cable structure, PCD1 has photogenerated carriers with longer lifetimes compared to the conventional electron acceptor [6,6]-phenyl-C-61-butyric acid methyl ester. A phase-separated columnar morphology is observed in a bulk-heterojunction (BHJ) material made by the physical blend of a low band-gap conjugated polymer, [poly[2,6-(4,4-bis-(2-ethylhexyl)-4H-cyclopenta [2,1-b;3,4-b']-dithiophene)-alt-4,7-(2,1,3-benzothia-diazole)] (PCPDTBT), and PCD1. With a specific phase structure in the solid state and in the blend, PCD1 is shown to be a promising candidate as a new electron acceptor in high performance BHJ polymer solar cells.
URI: http://dx.doi.org/10.1002/aenm.201200060
http://hdl.handle.net/11536/20656
ISSN: 1614-6832
DOI: 10.1002/aenm.201200060
期刊: ADVANCED ENERGY MATERIALS
Volume: 2
Issue: 11
起始頁: 1375
結束頁: 1382
顯示於類別:期刊論文


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