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CC BY-NC-ND 4.0 · Organic Materials 2020; 02(02): 071-077
DOI: 10.1055/s-0040-1702933
Original Article
The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial-License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/). (2020) The Author(s).

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

Shiyu Li
a   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
a   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
a   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
a   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 
a   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 
a   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
› Author Affiliations 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)

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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.

Key words

interfaces - charge transfer - dipoles - solar cells - surface doping

Supporting Information

Supporting Information for this article is available online at https://doi.org/10.1055/s-0040-1702933.


Supporting Information

 

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