Abstract
Herein, via chlorinated substitution in thiophene side-chain of benzo[1,2-b:4,5-b']dithiophene (BDT) unit, the diketopyrrolopyrrole (DPP) containing conjugated polymer PDPP-BDT-Cl is designed, which exhibits fine-tuned HOMO energy level with 0.18 eV deeper than the control PDPP-BDT without chlorination. When applied as donor material with 6,6-phenyl-C71-butyric acid methyl ester (PC71BM) acceptor in bulk heterojunction polymer solar cells(PSCs), enhanced open-circuit voltage (VOC) to 0.86 V and average power conversion efficiency (PCE) to 5.02% could be achieved for PDPP-BDT-Cl based PSCs compared to 0.74 V and 4.53% for PDPP-BDT. Furthermore, PDPP-BDT-Cl polymer demonstrate better thickness tolerance for more stable photovoltaic performances due to better donor/acceptor miscibility.
Original language | English |
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Article number | 130222 |
Journal | Materials Letters |
Volume | 300 |
DOIs | |
State | Published - 1 Oct 2021 |
Keywords
- Diketopyrrolopyrrole
- Open-circuit voltage
- Polymer solar cells
- Semiconductors
- Solar energy materials