Improved Stability of All-Polymer Solar Cells Using Crosslinkable Donor and Acceptor Polymers Bearing Vinyl Moieties in the Side-Chains

Na Yeon Kwon, Su Hong Park, Hungu Kang, Young Un Kim, Hong Diem Chau, Amit Kumar Harit, Han Young Woo, Hyo Jae Yoon, Min Ju Cho, Dong Hoon Choi

Research output: Contribution to journalArticlepeer-review

Abstract

Crosslinkable polymers have attracted tremendous attention in various fields of science and technology, owing to their potential utilization in applications requiring dimensional and morphological stability under thermal and mechanical stress. In this study, random terpolymers were successfully synthesized by introducing thiophene-based monomers bearing vinyl functional groups in the side-chain of the polymer donor (PBDBT-BV20) and polymer acceptor (N2200-TV10) structures. The physical properties of the blend films of PBDBT-BV20 and N2200-TV10 before and after thermal crosslinking were extensively investigated and compared to those of the homogeneous individual polymer films. The results revealed that a network polymer with donor and acceptor polymer chains, which can lock the internal morphology, could be achieved by inducing crosslinking between the vinyl groups in the mixed state of PBDBT-BV20 and N2200-TV10. In addition, the power conversion efficiency (PCE) of the polymer solar cells (PSCs) containing the blend films that were crosslinked by a two-step thermal annealing process was improved. The enhanced PCE could be attributed to the individual crystallization of PBDBT-BV20 and N2200-TV10 in the blend phase at 120 °C and then thermal crosslinking at 140 °C. In addition, the PSCs with the crosslinked blend film exhibited an excellent shelf-life of over 1200 h and a thermally stable PCE. Furthermore, the crosslinked blend film exhibited excellent mechanical stability under bending stress in flexible PSCs using plastic substrates.

Original languageEnglish
Pages (from-to)16754-16765
Number of pages12
JournalACS Applied Materials and Interfaces
Volume13
Issue number14
DOIs
Publication statusPublished - 2021 Apr 14

Keywords

  • all-polymer solar cell
  • polymer acceptor
  • polymer donor
  • stability
  • thermal crosslink

ASJC Scopus subject areas

  • Materials Science(all)

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