Effects of Soft Insulating Polymer Doping on the Photovoltaic Properties of Polymer鈥揊ullerene Blend Solar Cells

详细信息    查看全文

• 作者：Fu-Chiao Wu ; Shu-Wei Hsu ; Horng-Long Cheng ; Wei-Yang Chou ; Fu-Ching Tang
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：May 2, 2013
• 年：2013
• 卷：117
• 期：17
• 页码：8691-8696
• 全文大小：411K
• 年卷期：v.117,no.17(May 2, 2013)
• ISSN：1932-7455

文摘

The blending of organic semiconductor and insulating polymer as an active layer of organic transistors has been assessed by several studies and may open new possibilities for advantageous functions. However, studies on the use of insulating polymer doping in organic solar cells are rarely conducted. In this research, a blending film comprising regioregular poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C₆₁-butyric acid methyl ester (PCBM) was doped with a soft insulating poly(methyl methacrylate) (PMMA) to act as an active layer of a solar cell. The fill factor (FF) and open-circuit voltage (V_OC) of P3HT:PCBM solar cells were improved after PMMA doping. The microstructure-dependent photovoltaic properties of devices with different fractions of PMMA were investigated using spectroscopy and quantum chemical calculations. We highlight that PMMA doping leads to a more homogeneous conformation of P3HT chains, fewer vacancies, and fewer leakage pathways in blending films. Consequently, charges can be efficiently transported to the electrodes of devices, resulting in enhanced FF and V_OC. The results of theoretical calculations at the microscopic molecular level also confirmed the enhanced electrical performance of devices from PMMA doping.