Journal
SUSTAINABLE ENERGY & FUELS
Volume 6, Issue 3, Pages 682-692Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1se01748a
Keywords
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Funding
- RFBR [18-53-80066, 18-29-23004, 21-53-53037]
- Ministry of Science and Higher Education of the Russian Federation
- Department of Science and Technology, Government of India, New Delhi
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A novel D-A copolymer P125 with deep HOMO energy level and broad absorption was designed and used as a donor in ternary polymer solar cells, achieving enhanced performance due to the incorporation of a third component DBTBT-IC and its strong crystallization.
We have designed a simple and new D-A copolymer (PDTQxD-BDTTZ) denoted as P125 based on 8H-pyrrolo[3,4-b]dithieno[3,2-f:2',3'-h]quinoxaline-8,10(9H)-dione (PDTQxD) and thiazole functionalized benzo[1,2-b:4,5-b']dithiophene (BDTTZ) as acceptor and donor units, respectively, and its optical and electrochemical properties are investigated in detail. P125 showed a deeper HOMO energy level and broad absorption from 300 nm to 680 nm. P125 is used as a donor for the fabrication of binary and ternary polymer solar cells using two non-fullerene small molecule acceptors i.e., medium bandgap DBTBT-IC and narrow bandgap Y6. The optimized P125:DBTBT-IC:Y6 (1 : 0.2 : 1.0) ternary-based polymer solar cell attained overall PCE of 16.44%, which is higher than that for optimized binary P125:DBTBT-IC (12.23%) and P125:Y6 (13.09%). The incorporation of DBTBT-IC as the third component not only imparts the energy transfer from DBTBT-IC to Y6 but also optimizes the morphology and nanoscale phase separation in the active layer, leading to balanced charge transport and reduced charge recombination. The enhanced photovoltaic performance of ternary-based polymer solar cells is a result of the strong crystallization of DBTBT-IC.
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