A diketopyrrolopyrrole-based regular terpolymer bearing two different pi-extended donor units and its application in solar cells
- Authors
- Kim, Sang Beom; Um, Hyun Ah; Kim, Hyung Jong; Cho, Min Ju; Choi, Dong Hoon
- Issue Date
- 4월-2016
- Publisher
- ELSEVIER
- Keywords
- Polymer semiconductor; Terpolymer; Crystalline morphology; Thin-film transistor; Polymer solar cell
- Citation
- ORGANIC ELECTRONICS, v.31, pp.198 - 206
- Indexed
- SCIE
SCOPUS
- Journal Title
- ORGANIC ELECTRONICS
- Volume
- 31
- Start Page
- 198
- End Page
- 206
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/89022
- DOI
- 10.1016/j.orgel.2016.01.029
- ISSN
- 1566-1199
- Abstract
- In this study, to adjust the desired molecular energy levels and bandgap energies of polymers for photovoltaic applications, a regular terpolymer structure was designed. A new regular terpolymer, poly(DPP4T-alt-TBP), containing diketopyrrolopyrrole (DPP), BT, and BP units in the repeating group was successfully synthesized. The DPP-BT monomeric unit in polymer backbone enhanced chain packing and induced a high-lying highest occupied molecular orbital (HOMO) level and the DPP-BP segment induced a deeper HOMO level. The lowest unoccupied molecular orbital (LUMO) level of the terpolymer was also controlled in a similar manner. The HOMO level of the terpolymer was similar to that of poly(DPP-alt-BP), and the energies of the LUMOs were governed by the DPP-BT unit. The polymer chain arrangement of the terpolymer on the substrate was observed to be a mix of face-on and edge-on orientations, which is a different chain arrangement mode to those shown in both poly(DPP-alt-BP) and poly(DPP-alt-BT). A TFT fabricated with poly(DPP4T-alt-TBP) had a charge carrier mobility of 0.59 cm(2) V (1) s (1) and a moderately high current on/off ratio. Furthermore, a polymer solar cell containing the terpolymer and PC71BM had a power conversion efficiency of 4.54%, which is significantly higher than those of the PCEs of poly(DPP-alt-BP) and poly(DPP-alt-BT)-based solar cells with identical device configurations. (C) 2016 Elsevier B.V. All rights reserved.
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