We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
A Supramolecular 'Double-Cable' Structure with a 129<sub>44</sub> Helix in a Columnar Porphyrin-C<sub>60</sub> Dyad and its Application in Polymer Solar Cells.
- Authors
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.
- Abstract
A novel porphyrin-C60 dyad (PCD1) is designed and synthesized to investigate and manipulate the supramolecular structure where geometrically isotropic [such as [60]fullerene (C60)] 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 °C with a latent heat (Δ H) of 18.5 kJ mol−1. The phase formation is majorly driven by the cooperative intermolecular Por-Por and C60-C60 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 C60 peripheral channels. These 'double-cable' columns further pack into a hexagonal lattice with a = b = 4.65 nm, c = 41.3 nm, α = β = 90°, and γ = 120°. The column repeat unit is determined to possess a 12944 helix. With both donor (D; Pro) and acceptor (A; C60) units having their own connecting channels as well as the large D/A interface within the supramolecular 'double-cable' structure, PCD1 has photogenerated carriers with longer lifetimes compared to the conventional electron acceptor [6,6]-phenyl-C61-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)-4 H-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.
- Publication
Advanced Energy Materials, 2012, Vol 2, Issue 11, p1375
- ISSN
1614-6832
- Publication type
Article
- DOI
10.1002/aenm.201200060