Influence of solution heating on the properties of PEDOT:PSS colloidal solutions and impact on the device performance of polymer solar cells
Influence of solution heating on the properties of PEDOT:PSS colloidal solutions and impact on the device performance of polymer solar cells
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DOI：
10.1016/j.orgel.2011.07.003
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发表时间：
2011-10-01
影响因子：
3.2
通讯作者：
Greenham, Neil C.
中科院分区：
文献类型：
--
作者：
Friedel, Bettina;Brenner, Thomas J. K.;Greenham, Neil C.
我们研究了温度变化对电极聚合物聚（3，4-乙撑二氧噻吩）：聚（苯乙烯磺酸）（PEDOT：PSS）的胶体溶液的影响及其对使用共轭聚合物共混物作为光活性材料的光伏器件的后果。通过改变PEDOT：PSS溶液温度在20和90 ° C之间，我们观察到PEDOT：PSS颗粒尺寸的可逆温度依赖性变化。该过程与PSS电解质链的温度和浓度依赖性相变相关联。我们发现了最佳的器件性能，特别是太阳能电池的高量子效率和功率转换效率，其中PEDOT：PSS层由70摄氏度的溶液制成。在考虑薄膜的形态，颗粒大小，导电性和功函数，我们得出结论，提高器件性能源于从加热的解决方案沉积的薄膜的导电性增强。虽然膜电导率随溶液温度而按摩尔比增加，但使用高于70 ° C的溶液温度生产的器件受到PEDOT：PSS层的功函数增加的影响。(C)2011爱思唯尔有限公司版权所有。
We have investigated the effects of temperature variation on colloidal solutions of the electrode polymer poly(3,4-ethylenedioxythiophene):poly(styrenesulfonic acid) (PEDOT:PSS) and its consequences for photovoltaic devices using conjugated polymer blends as the photoactive material. By variation of the PEDOT:PSS solution temperature between 20 and 90 degrees C we observed reversible temperature-dependent change in size of the PEDOT:PSS particles. This process is associated with temperature and concentration dependent phase transitions of the PSS electrolyte chains. We found optimum device performance, in particular high quantum efficiency and power conversion efficiency for solar cells, with PEDOT:PSS layers produced from 70 degrees C solutions. After consideration of film morphology, particle size, conductivity and work function, we conclude that improved device performance originates from enhanced conductivity in films deposited from heated solutions. While film conductivity increases mo\notonically with solution temperature, devices produced using solution temperatures greater than 70 degrees C suffer from the increased work function of the PEDOT:PSS layer. (C) 2011 Elsevier B.V. All rights reserved.