Ternary Organic Solar Cells with Minimum Voltage Losses

Wang, Chuanfei; Zhang, Wei; Meng, Xiangyi; Bergqvist, Jonas; Liu, Xianjie; Genene, Zewdneh; Xu, Xiaofeng; Yartsev, Arkady; Inganäs, Olle; Ma, Wei; Wang, Ergang; Fahlman, Mats

doi:10.1002/aenm.201700390

Title: Ternary Organic Solar Cells with Minimum Voltage Losses

Journal Article · Thu Jul 20 00:00:00 EDT 2017 · Advanced Energy Materials

DOI:https://doi.org/10.1002/aenm.201700390· OSTI ID:1400846

Wang, Chuanfei ^[1]; Zhang, Wei ^[2]; Meng, Xiangyi ^[3]; Bergqvist, Jonas ^[4]; Liu, Xianjie ^[1]; Genene, Zewdneh ^[5]; Xu, Xiaofeng ^[6]; Yartsev, Arkady ^[2]; Inganäs, Olle ^[4]; Ma, Wei ^[3]; Wang, Ergang ^[6]; Fahlman, Mats ^[1]

Division of Surface Physics and Chemistry, IFM Linköping University SE‐581 83 Linköping Sweden
Division of Chemical Physics Lund University Box 124 221 00 Lund Sweden
State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049 China
Biomolecular and Organic Electronics, IFM Linköping University SE‐581 83 Linköping Sweden
Department of Chemistry Addis Ababa University P.O. Box 33658 Addis Ababa Ethiopia, Department of Chemistry and Chemical Engineering Chalmers University of Technology SE‐412 96 Göteborg Sweden
Department of Chemistry and Chemical Engineering Chalmers University of Technology SE‐412 96 Göteborg Sweden

Abstract A new strategy for designing ternary solar cells is reported in this paper. A low‐bandgap polymer named PTB7‐Th and a high‐bandgap polymer named PBDTTS‐FTAZ sharing the same bulk ionization potential and interface positive integer charge transfer energy while featuring complementary absorption spectra are selected. They are used to fabricate efficient ternary solar cells, where the hole can be transported freely between the two donor polymers and collected by the electrode as in one broadband low bandgap polymer. Furthermore, the fullerene acceptor is chosen so that the energy of the positive integer charge transfer state of the two donor polymers is equal to the energy of negative integer charge transfer state of the fullerene, enabling enhanced dissociation of all polymer donor and fullerene acceptor excitons and suppressed bimolecular and trap assistant recombination. The two donor polymers feature good miscibility and energy transfer from high‐bandgap polymer of PBDTTS‐FTAZ to low‐bandgap polymer of PTB7‐Th, which contribute to enhanced performance of the ternary solar cell.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: DE‐AC02‐05CH11231

OSTI ID:: 1400846

Journal Information:: Advanced Energy Materials, Journal Name: Advanced Energy Materials Vol. 7 Journal Issue: 21; ISSN 1614-6832

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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Cited by: 42 works

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