Simultaneous Improvement of Efficiency and Stability of Organic Photovoltaic Cells by using a Cross-Linkable Fullerene Derivative

Ling Hong, Huifeng Yao*, Yong Cui, Runnan Yu, You Wei Lin, Tsung Wei Chen, Ye Xu, Jinzhao Qin, Chain Shu Hsu, Ziyi Ge, Jianhui Hou

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Improving power conversion efficiencies (PCEs) and stability are two main tasks for organic photovoltaic (OPV) cells. In the past few years, although the PCE of the OPV cells has been considerably improved, the research on device stability is limited. Herein, a cross-linkable material, cross-linked [6,6]-phenyl-C61-butyric styryl dendron ester (c-PCBSD), is applied as an interfacial modification layer on the surface of zinc oxide and as the third component into the PBDB-TF:Y6-based OPV cells to enhance photovoltaic performance and long-term stability. The PCE of the OPV cells that underwent the two-step modification increased from 15.1 to 16.1%. In particular, such OPV cells exhibited much better stability under both thermal and air conditions because of the decreased number of interfacial defects and stable interfacial and active layer morphologies. The results demonstrated that the introduction of a cross-linkable fullerene derivative into the interfacial and active layers is a feasible method to improve the PCE and stability of OPV cells.

Original languageEnglish
Article number2101133
JournalSmall
Volume17
Issue number24
DOIs
StatePublished - 17 Jun 2021

Keywords

  • burn-in loss
  • cross-linkable fullerene
  • non-fullerene acceptors
  • organic photovoltaic cells
  • thermal and air stability

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