Stacked organic solar cells based on pentacene and C₆₀

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• 作者：David Cheyns ; Hans Gommans ; Mathieu Odijk ; Jef Poortmans ; Paul Heremans
• 关键词：Planar heterojunction solar cells ; Stacked solar cells ; Fullerene ; Tandem
• 刊名：Solar Energy Materials and Solar Cells
• 出版年：2007
• 期刊代码：81_09270248
• 类别：ce
• 出版时间：6 March 2007
• 卷：91
• 期：5
• 页码：399-404
• 文件大小：449 K

摘要

In order to improve photon harvesting, two small molecule organic solar cells are placed in series on top of each other. These stacked cells need an efficient recombination center in between both cells. In this study we test vacuum deposited metal layers as recombination centers with pentacene and buckminsterfullerene (C₆₀) as donor and acceptor, respectively. S-shaped curves are visible in the I–V characteristics when using thin layers of aluminum, indicating a barrier for extraction inside the device. Thin metal layers of gold or silver result in an increased open-circuit voltage without the appearance of these S-shaped features.