Over 16% efficiency all-polymer solar cells by sequential deposition

Bangbang Li, Xuanyu Zhang, Ziang Wu, Jie Yang, Bin Liu, Qiaogan Liao, Junwei Wang, Kui Feng, Rui Chen, Han Young Woo, Fei Ye, Li Niu, Xugang Guo, Huiliang Sun

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

All-polymer solar cells (all-PSCs) have received extensive attention due to their excellent mechanical robustness and performance stability. However, the power conversion efficiency (PCE) of all-PSCs still lags behind those of organic solar cells (OSCs) based on non-fullerene small molecule acceptors. Herein, we report highly efficient all-PSCs via sequential deposition (SD) with donor and acceptor layers coated sequentially to optimize the film microstructure. Compared with the bulk heterojunction (BHJ) all-PSCs, an optimized morphology with vertical component distribution was achieved for the SD-processed all-PSCs due to the synergistic effect of swelling of polymer films and using additive. Such strategy involves using chlorobenzene as the first layer processing-solvent for polymer donor, chloroform as the second processing-solvent for polymer acceptor with trace 1-chlor-onaphthalene, efficiently promoting exciton dissociation and charge extraction and reducing trap-assisted recombination. Consequently, over 16% all-PSCs fabricated via SD method was realized for the first time, which is much higher than that (15.2%) of its BHJ counterpart and also among the highest PCEs in all-PSCs. We have further demonstrated the generality of this approach in various all-polymer systems. This work indicates that the SD method can yield excellent all-PSCs and provides a facile approach to fabricating high-performance all-PSCs.[Figure not available: see fulltext.].

Original languageEnglish
Pages (from-to)1157-1163
Number of pages7
JournalScience China Chemistry
Volume65
Issue number6
DOIs
Publication statusPublished - 2022 Jun

Keywords

  • all-polymer solar cells
  • planar heterojunction
  • polymer acceptors
  • sequential deposition

ASJC Scopus subject areas

  • Chemistry(all)

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