Construction of Interface Dipoles by Surface Doping and Their Role in the Open Circuit Voltage in Polymer Solar Cells

Shiyu Li; Xinbo Wen; Jiadong Zhou; Nan Zheng; Linlin Liu; Zengqi Xie

doi:10.1055/s-0040-1702933

Organic Materials (Apr 2020)

Construction of Interface Dipoles by Surface Doping and Their Role in the Open Circuit Voltage in Polymer Solar Cells

Shiyu Li,
Xinbo Wen,
Jiadong Zhou,
Nan Zheng,
Linlin Liu,
Zengqi Xie

Affiliations

Shiyu Li: State Key Laboratory of Luminescent Materials and Devices, Institute of Polymer Optoelectronic Materials and Devices, Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, South China University of Technology, No 381 Wushan Road, Guangzhou 510640, P. R. China
Xinbo Wen: State Key Laboratory of Luminescent Materials and Devices, Institute of Polymer Optoelectronic Materials and Devices, Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, South China University of Technology, No 381 Wushan Road, Guangzhou 510640, P. R. China
Jiadong Zhou: State Key Laboratory of Luminescent Materials and Devices, Institute of Polymer Optoelectronic Materials and Devices, Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, South China University of Technology, No 381 Wushan Road, Guangzhou 510640, P. R. China
Nan Zheng: State Key Laboratory of Luminescent Materials and Devices, Institute of Polymer Optoelectronic Materials and Devices, Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, South China University of Technology, No 381 Wushan Road, Guangzhou 510640, P. R. China
Linlin Liu: State Key Laboratory of Luminescent Materials and Devices, Institute of Polymer Optoelectronic Materials and Devices, Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, South China University of Technology, No 381 Wushan Road, Guangzhou 510640, P. R. China
Zengqi Xie: State Key Laboratory of Luminescent Materials and Devices, Institute of Polymer Optoelectronic Materials and Devices, Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, South China University of Technology, No 381 Wushan Road, Guangzhou 510640, P. R. China

DOI: https://doi.org/10.1055/s-0040-1702933
Journal volume & issue: Vol. 02, no. 02
pp. 071 – 077

Abstract

Read 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.

Published in Organic Materials

ISSN: 2625-1825 (Online)
Publisher: Georg Thieme Verlag
Country of publisher: Germany
LCC subjects: Science: Chemistry
Website: https://doi.org/10.1055/s-00040992

About the journal

Abstract

Keywords