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《Acta Polymerica Sinica》 2018-02
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In situ Polymerization of PEDOT:π-Conjugated Polyelectrolyte and Application as Hole Transport Layer in Polymer Solar Cells

Yu-juan Xiao;Qian-nan He;Huan-yu Zhou;Hai-tao Xu;Li-cheng Tan;Yi-wang Chen;College of Chemistry,Nanchang University;Jiangxi Provincial Key Laboratory of New Energy Chemistry/Institute of Polymers,Nanchang University;  
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 ? 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:PC71 BM/PFN/Al were measured under one standard sun by solar simulator with an Air Mass 1.5 global(AM 1.5 G) and an irradiation intensity of 100 mW/cm~2.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(JSC) of 18.07 m A/cm~2,open circuit voltage(VOC) of 0.77 and fill factor(FF) of 61.31%,respectively.Compared to that of PEDOT:PSS,the obvious increased JSC 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.
【Fund】: 国家自然科学基金(基金号51672121 51425304);; 江西省科技合作领域重点研发计划(项目号20161BBH80044)资助项目
【CateGory Index】: O633.5;TM914.4
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