A Generally Applicable Approach Using Sequential Deposition to Enable Highly Efficient Organic Solar Cells

Huiting Fu, Wei Gao, Yuxiang Li, Francis Lin, Xin Wu, Jae Hoon Son, Jingdong Luo, Han Young Woo, Zonglong Zhu, Alex K.Y. Jen

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

Bulk-heterojunction (BHJ) organic solar cells (OSCs) are prepared by a common one-step solution casting of donor-acceptor blends often encounter dynamic morphological evolution which is hard to control to achieve optimal performance. To overcome this hurdle, a generally applicable, sequential processing approach has been developed to construct high-performance OSCs without involving tedious processes. The morphology of photoactive layers comprising a polymer donor (PM6) and a nonfullerene acceptor (denoted as Y6-BO) can be precisely manipulated by tuning Y6-BO layer with a small amount of 1-chloronaphthalene additive to induce the structural order of Y6-BO molecules to impact the blend phase. The results of a comparative investigation elucidate that such two-step procedure can afford more favorable BHJ microstructure than that achievable with the single blend-casting route. This translates into improved carrier generation and transport, and suppressed charge recombination. Consequently, the devices based on sequential deposition (SD) deliver a remarkable efficiency up to 17.2% (the highest for SD OSCs to date), outperforming that from the conventional BHJ devices (16.4%). The general applicability of this approach has also been tested on several other nonfullerene acceptors which show similar improvements. These results highlight that SD is a promising processing alternative to promote better photovoltaic performance and reduce production requirements.

Original languageEnglish
Article number2000687
JournalSmall Methods
Volume4
Issue number12
DOIs
Publication statusPublished - 2020 Dec 11

Keywords

  • morphology control
  • organic solar cells
  • power conversion efficiencies
  • sequential deposition

ASJC Scopus subject areas

  • Materials Science(all)
  • Chemistry(all)

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