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Flexographic printing of polycarbazole-based inverted solar cells
Organic Electronics ( IF 3.2 ) Pub Date : 2017-10-16 , DOI: 10.1016/j.orgel.2017.10.016
Salima Alem , Neil Graddage , Jianping Lu , Terho Kololuoma , Raluca Movileanu , Ye Tao

The mass production of organic photovoltaics requires high throughput processes capable of producing a functional active layer which is homogenous, pinhole free and of a specified thickness. Common methods to achieve this are slot-die coating and gravure printing. We have demonstrated the fabrication of poly(N-9′-heptadecanyl-2,7-carbazole-alt-5,5-(4′,7′-di-2-thienyl-2′,1′,3′-benzothiadiazole (PCDTBT) based photovoltaic cells using the flexographic printing technique, which enables high throughput patterned active layers to be deposited on flexible substrates at lower cost. This was achieved by optimizing the flexographic plate pattern, print speed, the solvent and the drying process. By incorporating halftone patterning, a common process in the graphics printing industry, and optimizing the printing speed, the homogeneity of the active layer print was significantly improved. Further studies of suitable solvents and drying conditions led to reduced pinhole formation and improved uniformity. The functionality of the flexographically printed active layer was demonstrated by fabrication of 1 cm2 photovoltaic cells which showed an efficiency of up to 3.5%, which is comparable to alternative deposition techniques. These results demonstrate the suitability of flexography as a fabrication technique for bulk heterojunction organic photovoltaics.



中文翻译:

基于聚咔唑的倒置太阳能电池的苯胺印刷

有机光伏的大规模生产需要能够生产均匀,无针孔且具有指定厚度的功能性活性层的高通量工艺。实现此目的的常用方法是缝模涂布和凹版印刷。我们已经证明了poly(N-9'-十七烷基-2,7-咔唑-alt-5,5-(4',7'-二-2-噻吩-2',1',3'-苯并噻二唑(PCDTBT)为基础的光伏电池通过优化柔性版印刷版图,印刷速度,溶剂和干燥工艺,实现了高通量的图案化活性层以较低的成本沉积在柔性基板上的印刷技术。在图形印刷行业中,通过优化印刷速度,显着改善了活性层印刷品的均匀性;进一步研究了合适的溶剂和干燥条件,减少了针孔的形成,改善了均匀性;柔性版印刷活性层的功能性得到了证明。 1厘米2光伏电池的效率高达3.5%,可与替代沉积技术相媲美。这些结果证明了柔性版印刷作为制造体异质结有机光伏器件的技术的适用性。

更新日期:2017-10-16
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