Polymorphism of a semi-crystalline diketopyrrolopyrrole-terthiophene polymer
| Autor: | Mengmeng Li, Pieter J. Leenaers, René A. J. Janssen, Junyu Li, MM Martijn Wienk |
|---|---|
| Přispěvatelé: | Molecular Materials and Nanosystems, Macromolecular and Organic Chemistry, ICMS Core, EIRES Chem. for Sustainable Energy Systems |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Polymers and Plastics Band gap Stacking 02 engineering and technology 010402 general chemistry 7. Clean energy 01 natural sciences polymorphism chemistry.chemical_compound Terthiophene Materials Chemistry Copolymer Physical and Theoretical Chemistry Thin film Research Articles chemistry.chemical_classification aggregation Polymer 021001 nanoscience & nanotechnology 0104 chemical sciences Amorphous solid Crystallography chemistry Polymorphism (materials science) electronic devices diketopyrrolopyrrole polymers chain orientation 0210 nano-technology Research Article |
| Zdroj: | Journal of Polymer Science (2020) Journal of Polymer Science, 59, 1285-1292 Journal of Polymer Science, 59(12), 1285-1292. Wiley |
| ISSN: | 2642-4150 |
| DOI: | 10.1002/pol.20200673 |
| Popis: | Few semiconducting polymers are known that possess more than one semi‐crystalline structure. Guidelines for rationalizing or creating polymorphism in these materials do not exist. Two different semi‐crystalline polymorphs, β 1 and β 2, and an amorphous α phase have recently been identified for alternating diketopyrrolopyrrole‐quaterthiophene copolymers (PDPP4T). The polymorphs differ structurally by the π–π stacking distance, and electronically by the optical bandgap and charge carrier mobility. Here we investigate the corresponding terthiophene (PDPP3T) derivatives, to study the effect of the relative orientation of adjacent DPP units on the polymorphism. In PDPP3T, the relative orientation of DPP units alternates along the chain, while in PDPP4T it is constant. We show that the two polymorphs, β 1 and β 2, can also be generated for a PDPP3T polymer in solution and thin film. Interestingly, compared to PDPP4T, more solvents can induce the two distinct semi‐crystalline polymorphs for PDPP3T via a β 1 → α → β 2 polymorphic transition. Two distinct semi‐crystalline polymorphs (β 1 and β 2) of a poly(diketopyrrolopyrrole‐alt‐terthiophene) form when films are cast from different solvents. While chloroform results in the β 1 phase, several chlorinated aromatic solvents provide the β 2 phase in which the polymer exhibits a smaller π–π stacking distance. The enhanced π–π stacking of the β 2 phase compared to the β 1 phase causes a redshifted optical absorption which contributes to the photocurrent in organic solar cells and doubles the mobility in organic field‐effect transistors. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text