Fused Cyclopentadithienothiophene Acceptor Enables Ultrahigh Short-Circuit Current and High Efficiency >11% in As-Cast Organic Solar Cells

Qiao He, Munazza Shahid, Jiaying Wu, Xuechen Jiao, Flurin D. Eisner, Thomas Hodsden, Zhuping Fei, Thomas D. Anthopoulos, Christopher R. McNeill, James R. Durrant, Martin Heeney

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

A new method to synthesize an electron-rich building block cyclopentadithienothiophene (9H-thieno-[3,2-b]thieno[2″,3″:4′,5′]thieno[2′,3′:3,4]cyclopenta[1,2-d]thiophene, CDTT) via a facile aromatic extension strategy is reported. By combining CDTT with 1,1-dicyanomethylene-3-indanone endgroups, a promising nonfullerene small molecule acceptor (CDTTIC) is prepared. As-cast, single-junction nonfullerene organic solar cells based on PFBDB-T: CDTTIC blends exhibit very high short-circuit currents up to 26.2 mA cm−2 in combination with power conversion efficiencies over 11% without any additional processing treatments. The high photocurrent results from the near-infrared absorption of the CDTTIC acceptor and the well-intermixed blend morphology of polymer donor PFBDB-T and CDTTIC. This work demonstrates a useful fused ring extension strategy and promising solar cell results, indicating the great potential of the CDTT derivatives as electron-rich building blocks for constructing high-performance small molecule acceptors in organic solar cells.
Original languageEnglish (US)
Pages (from-to)1904956
JournalAdvanced Functional Materials
Volume29
Issue number40
DOIs
StatePublished - Aug 8 2019

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