Effectively enhancing the open-circuit voltage via chlorinated substitution in DPP-based polymer donor for polymer solar cells

Zhongyuan Xue, Ruitao Yu, Mengyuan Zhu, Yijing Wu, Yinming He, Xuyu Gao, Youtian Tao

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

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 languageEnglish
Article number130222
JournalMaterials Letters
Volume300
DOIs
StatePublished - 1 Oct 2021

Keywords

  • Diketopyrrolopyrrole
  • Open-circuit voltage
  • Polymer solar cells
  • Semiconductors
  • Solar energy materials

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