期刊
APPLIED PHYSICS LETTERS
卷 94, 期 25, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3154554
关键词
electron-hole recombination; fullerene devices; fullerenes; organic compounds; photoconductivity; solar cells; thin films; vacuum deposition
We study the influence of different substrate temperatures during the deposition of the ZnPc:C-60 blend layer in bulk heterojunction organic solar cells. It is shown that substrate heating during evaporation leads to a significant improvement in the solar cell performance mainly due to an increase in photocurrent and fill factor (FF). This is attributed to improved morphology resulting in better charge carrier percolation pathways within the ZnPc:C-60 blend, leading to reduced transport losses. Using this method, blend layer thicknesses of 150 nm are possible without loss in FF, which requires a three-dimensional interpenetrating network without isolated clusters. When heating the substrate up to 110 degrees C, an efficiency of 2.56% is achieved compared to 1.59% for an identical device prepared at room temperature.
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