A Simple n-Dopant Derived from Diquat Boosts the Efficiency of Organic Solar Cells to 18.3%

Yuanbao Lin, Mohamad Insan Nugraha, Yuliar Firdaus, Alberto Davide Scaccabarozzi, Filip Aniés, Abdul-Hamid M. Emwas, Emre Yengel, Xiaopeng Zheng, Jiakai Liu, Wandi Wahyudi, Emre Yarali, Hendrik Faber, Osman Bakr, Leonidas Tsetseris, Martin Heeney, Thomas D. Anthopoulos

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

Molecular doping has recently been shown to improve the operating characteristics of organic photovoltaics (OPVs). Here, we prepare neutral Diquat (DQ) and use it as n-dopant to improve the performance of state-of-the-art OPVs. Adding DQ in ternary bulk-heterojunction (BHJ) cells based of PM6:Y6:PC71BM is found to consistently increase their power conversion efficiency (PCE) from 16.7 to 17.4%. Analyses of materials and devices reveal that DQ acts as n-type dopant and morphology modifier for the BHJ leading to observable changes in its surface topography. The resulting n-doped BHJs exhibit higher optical absorption coefficients, balanced ambipolar transport, longer carrier lifetimes and suppressed bimolecular recombination, which are ultimately responsible for the increased PCE. The use of DQ was successfully extended to OPVs based on PM6:BTP-eC9:PC71BM for which a maximum PCE of 18.3% (uncertified) was achieved. Our study highlights DQ as a promising dopant for application in next generation organic solar cells.
Original languageEnglish (US)
Pages (from-to)3663-3671
Number of pages9
JournalACS Energy Letters
DOIs
StatePublished - Oct 30 2020

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