Immobilization of Conjugated Polymer Domains for Highly Stable Non-Fullerene-Based Organic Solar Cells

Ka Yeon Ryu, Juhwan Lee, Taesuk Jun, Daeyeon Lee, Bongsoo Kim, Du Yeol Ryu, Kyungkon Kim

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


To commercialize organic solar cells (OSCs), changes in the optimized morphology of the photoactive layer caused by external stimuli that cause degradation must be addressed. This work improves OSC stability by utilizing the cross-linking additive 1,8-dibromooctane (DBO) and a sequential deposition process (XSqD) to fabricate the photoactive layer. The cross-linking additive in the donor polymer (PTB7-Th) improves polymer crystallinity and immobilizes the crystalline morphology by partial photo-cross-linking. Ellipsometry experiments confirm the increase in the glass transition temperature of cross-linked PTB7-Th. The polymer crystallinity is further improved after removal of non-cross-linked polymer and residual additive by chlorobenzene. The cross-linked polymer layer forms an efficient and stable heterojunction with a nonfullerene acceptor (IEICO-4F) layer via an XSqD process. The OSC based on the immobilized PTB7-Th exhibits excellent stability against light soaking and thermal aging.

Original languageEnglish
Pages (from-to)23474-23486
Number of pages13
JournalACS Applied Materials and Interfaces
Issue number20
StatePublished - 25 May 2022

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  • cross-linking
  • non-fullerene acceptor
  • organic solar cell stability
  • organic solar cells
  • sequential deposition


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