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CC BY-NC-ND 4.0 · Organic Materials 2020; 02(02): 071-077
DOI: 10.1055/s-0040-1702933
DOI: 10.1055/s-0040-1702933
Original Article
Construction of Interface Dipoles by Surface Doping and Their Role in the Open Circuit Voltage in Polymer Solar Cells
Funding Information National Natural Science Foundation of China (21733005, 21975076, 51521002, 51761135101, 51873068), the Fund of the Key Laboratory of Luminescence from Molecular Aggregates of Guangdong Province (2019B030301003), and Key Program of Guangzhou Scientific Research Special Project (201707020024, 201904020035).Further Information
Publication History
Received: 26 November 2019
Accepted after revision: 15 January 2020
Publication Date:
09 April 2020 (online)
Abstract
A kind of dipolar interface is realized by surface doping of poly-(3,4-ethylenedioxythiophene) (PEDOT) with tetrafluoro-tetracyano-quinodimethane (F4TCNQ). PEDOT is in situ synthesized by electrochemical polymerization of 3,4-ethylenedioxythiophene (EDOT) on an indium tin oxide (ITO) electrode, and then F4TCNQ is spin-coated atop the PEDOT layer. Because the LUMO of F4TCNQ is lower than the HOMO of PEDOT, the spontaneous electron transfer from PEDOT to F4TCNQ results in a bilayered structure of PEDOT cations and F4TCNQ anions. Thus, a permanent interfacial dipole is formed in the surface-doping system. The surface doping not only enhances the conductivity of PEDOT, but also increases the surface work function of the electrode. The dipolar film is applied as the anode interface in polymer solar cells (PSCs), and the results show that such an interface dipole plays a very important role in the open circuit voltage (V oc) of the PSCs.
Supporting Information
Supporting Information for this article is available online at https://doi.org/10.1055/s-0040-1702933.
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