New donor–acceptor copolymers with ultra-narrow band gap for photovoltaic application
| Autor: | S. A. Kuklin, I. O. Konstantinov, Alexei R. Khokhlov, Mukhamed L. Keshtov, D. Yu. Godovskii, Leeyih Wang, Mikhail M. Krayushkin |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
chemistry.chemical_classification
Absorption spectroscopy Chemistry Band gap Stacking 02 engineering and technology General Chemistry Polymer 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences Acceptor 0104 chemical sciences Moiety 0210 nano-technology Absorption (electromagnetic radiation) HOMO/LUMO |
| Zdroj: | Doklady Chemistry. 470:283-288 |
| ISSN: | 1608-3113 0012-5008 |
| Popis: | Two novel donor–acceptor (D–A) copolymers P1 and P2 with the thiazoloquinoxaline repeating acceptor moiety and different donor moieties of benzo[1,2-b:4,5-b']dithiophene and isomeric benzo[2,1-b:3,4-b']dithiophene have been prepared. The polymers show light absorption at 300–1200 nm and a band gap width of 0.98 and 1.14 eV, respectively. The energies of the HOMO (–5.42 and–5.29 eV) and LUMO (–3.90 and–3.83 eV) levels of polymers P1 and P2 have been determined. The absorption maximum for polymer P1 in the long-wavelength region is red-shifted by 161 nm, which is caused by stronger charge transfer in P1 as compared with P2. This fact indicates that the benzo[1,2-b:4,5-b']dithiophene structural moiety has a higher electron-donating ability than the benzo[2,1-b:3,4-b']dithiophene moiety. The red shift of the absorption spectrum of polymer P1 in comparison with that of P2 indicates that interchain π–π stacking interactions are more efficient in P1 than in P2. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|