Graded Absorption Layers in Bulk Heterojunction Organic Solar Cells

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• 作者：Beatrice Beyer ; Richard Pfeifer ; Johannes K. Zettler ; Olaf R. Hild ; Karl Leo
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：May 16, 2013
• 年：2013
• 卷：117
• 期：19
• 页码：9537-9542
• 全文大小：317K
• 年卷期：v.117,no.19(May 16, 2013)
• ISSN：1932-7455

文摘

Bulk heterojunction organic solar cells with a vertical variation of the C₆₀:ZnPc composition within the absorption layer have been fabricated. The resulting gradient layer has been characterized by UV/vis transmission and reflection spectroscopy. Depending on the mixing strategy, the formation of higher aggregated ZnPc species can be initialized earlier in a blended thin film. The gradient strength has been varied and its influence on the solar cell performance has been determined. A variation of the absorption layer thickness has been carried out to investigate a possible charge carrier transportation improvement. In order to explain the positive effect of a graded structure within the absorption layer, detailed voltage-dependent spectral response measurements have been performed. It is shown that not only the absorption behavior of the cell is improved, but also the charge carrier transportation properties.