Citation: Xiao Yu-juan, He Qian-nan, Zhou Huan-yu, Xu Hai-tao, Tan Li-cheng, Chen Yi-wang. In situ Polymerization of PEDOT: π-Conjugated Polyelectrolyte and Application as Hole Transport Layer in Polymer Solar Cells[J]. Acta Polymerica Sinica, ;2018, (2): 257-265. doi: 10.11777/j.issn1000-3304.2018.17215 shu

In situ Polymerization of PEDOT: π-Conjugated Polyelectrolyte and Application as Hole Transport Layer in Polymer Solar Cells

Xiao Yu-juan ^1,2 ,
He Qian-nan ¹ ,
Zhou Huan-yu ^1,2 ,
Xu Hai-tao ^1,2 ,
Tan Li-cheng ^1,2,, ,
Chen Yi-wang ^1,2,,

1.
College of Chemistry, Nanchang 330031
2.
Jiangxi Provincial Key Laboratory of New Energy Chemistry/Institute of Polymers, Nanchang University, Nanchang 330031

Corresponding author: Tan Li-cheng, tanlicheng@ncu.edu.cn Chen Yi-wang, ywchen@ncu.edu.cn
Received Date: 4 August 2017
Revised Date: 26 August 2017

Poly(3, 4-ethylenedioxythiophene) (PEDOT) is usually dispersed in water by incorporating polystyrene sulfonate (PSS) as a charge compensator and a template for polymerization. The polymerization behavior of 3, 4-ethylenedioxythiophene (EDOT) without assistance of insulating PSS was explored. Due to their semiconducting and hydrophilic characteristics, π-conjugated polyelectrolytes with sulfonic acid groups, namely PCPDT-T and PCPDT-2T, were used as template for in situ oxidative polymerization of PEDOT. The obtained PEDOT:polyelectrolyte composites showed good dispersibility in aqueous solution, which was used as hole transport layer (HTL) in polymer solar cells (PSCs). The morphologies and photoelectric properties of PEDOT:PSS and PEDOT:polyelectrolyte composites were characterized by Fourier transform infrared spectroscopy, ultraviolet-visible spectroscopy, ultraviolet photoelectron spectroscopy, atomic force microscopy, transmission electron microscopy and contact angle test, respectively. PEDOT:polyelectrolyte composites displayed suitable energy level, transmittance up to 95% (30 nm), hydrophobic surface morphology, as well as superior hole mobility, which were in favour of forming Ω contact with the active layer and increasing the injection and collection efficiency of the holes. Thus, improving the device photovoltaic performance. The current density-voltage (J-V) characteristics of the PSCs with the structure of Glass/ITO/HTL/PTB7-Th:PC₇₁BM/PFN/Al were measured under one standard sun by solar simulator with an Air Mass 1.5 global (AM 1.5G) and an irradiation intensity of 100 mW/cm². Compared to the photovoltaic characteristics for PEDOT:PSS based device, PSCs with PEDOT:T (1:2) as HTL yielded the highest power conversion efficiency (PCE) of 8.6% with a short current density (J_SC) of 18.07 mA/cm², open circuit voltage (V_OC) of 0.77 and fill factor (FF) of 61.31%, respectively. Compared to that of PEDOT:PSS, the obvious increased J_SC for PEDOT:polyelectrolyte composites based PSCs was ascribed to the high hole mobility and transmittance, which were consistent with the results from the space-charge limited current (SCLC) method and the external quantum efficiency (EQE) measurement.
- Poly (3, 4-ethylenedioxythiophene),
- Polyelectrolyte,
- In situ polymerization,
- Polymer solar cells,
- Composite
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1.
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