摘要
For the state-of-the-art organic solar cells(OSCs),PEDOT:PSS is the most popularly used hole transport material for the conventional structure.However,it still suffers from several disadvantages,such as low conductivity and harm to ITO due to the acidic PSS.Herein,a simple method is introduced to enhance the conductivity and remove the additional PSS by water rinsing the PEDOT:PSS films.The photovoltaic devices based on the water rinsed PEDOT:PSS present a dramatic improvement in efficiency from 15.98%to 16.75%in comparison to that of the untreated counterparts.Systematic characterization and analysis reveal that although part of the PEDOT:PSS is washed away,it still leaves a smoother film and the ratio of PEDOT to PSS is higher than before in the remaining films.It can greatly improve the conductivity and reduce the damage to substrates.This study demonstrates that finely modifying the charge transport materials to improve conductivity and reduce defeats has great potential for boosting the efficiency of OSCs.
本文开展了高效有机太阳电池的研究,基于空穴传输层的调控,制备了光电效率为16.75%的三元器件.在传统高效太阳电池中,PEDOT:PSS是应用最为广泛的一种空穴传输材料,但是过量的PSS会降低材料的导电性能,并腐蚀衬底和有源层降低器件的稳定性.本文通过去离子水冲洗PEDOT:PSS薄膜去除多余的PSS,剩余的PEDOT和PSS仍然以库仑力相互作用形成稳定的界面层.经过多种表征手段分析,相对于未处理的PEDOT:PSS,处理后的薄膜厚度减小,导电性和空穴迁移率明显提升,界面处的阻抗显著下降.以PM6为给体,Y6和PC71BM作为共同受体制备三元有机太阳电池,未处理的器件能量转化效率为15.9%.将PEDOT:PSS薄膜经过水处理之后,器件短路电流和填充因子分别由25.35 mA cm^-2提升到25.86 mA cm^-2,0.744提高到0.762,能量转化效率达到16.75%,这在有机太阳电池中处于较高水平.
作者
Qicong Li
Yang Sun
Cheng Yang
Kong Liu
MdRasidul Islam
Long Li
Zhijie Wang
Shengchun Qu
李其聪;孙阳;杨诚;刘孔;MdRasidul Islam;李龙;王智杰;曲胜春(Key Laboratory of Semiconductor Materials Science&Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices,Institute of Semiconductors,Chinese Academy of Sciences,Beijing 100083,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;Qian Xuesen Laboratory of Space Technology,China Academy of Space Technology,Beijing 100094,China)
基金
mostly supported by the National Key Research and Development Program of China(2017YFA0206600)
the Key Research Program of Frontier Science,Chinese Academy of Sciences(QYZDB-SSW-SLH006)
the National Natural Science Foundation of China(61674141,51972300,21975245)
the support from the Hundred Talents Program(Chinese Academy of Sciences)。
