A New Benzodithiophene Based Donor-Acceptor π-Conjugated Polymer for Organic Solar Cells

Saripally Sudhaker Reddy, Um Kanta Aryal, Hyunjung Jin, Thavamani Gokulnath, Durga Gayathri Rajalapati, Kakaraparthi Kranthiraja, Sung Tae Shin, Sung Ho Jin*

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A new benzodithiophene based donor-acceptor π-conjugated polymer (P1) is designed and explored as the photoactive donor for organic solar cells (OSCs). The synthesized donor polymer, P1 displays a wide absorption profile ranging from 300–750 nm with optical band gap of 1.61 eV and moderate ionization potential of −5.30 eV. It has good solubility in non-halogenated and halogenated organic solvents. Next, we fabricated OSCs with P1 by blending with PC71BM, the pristine polymer processed from chlorobenzene showed PCE of 2.79%. Upon addition of external additive diphenyl ether to the blend showed a dramatic improvement in PCE with maximum of 5.33%. DPE tailored the active layer morphology and showed two times higher PCE than pristine films. These results clearly indicate that the new polymer has a great potentiality for enhancing efficiency upon solvent additives, which will provide new routes for the development of new class of polymers for high-performance air-stable OSCs. [Figure not available: see fulltext.].

TidsskriftMacromolecular Research
Udgave nummer2
Sider (fra-til)179-183
Antal sider5
StatusUdgivet - 1. feb. 2020



Reddy, S. S., Aryal, U. K., Jin, H., Gokulnath, T., Rajalapati, D. G., Kranthiraja, K., Shin, S. T., & Jin, S. H. (2020). A New Benzodithiophene Based Donor-Acceptor π-Conjugated Polymer for Organic Solar Cells. Macromolecular Research, 28(2), 179-183. https://doi.org/10.1007/s13233-020-8079-z