Perovskite Solar Cells with Large-Area CVD-Graphene for Tandem Solar Cells

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• 作者：Felix Lang ; Marc A. Gluba ; Steve Albrecht ; J枚rg Rappich ; Lars Korte ; Bernd Rech ; Norbert H. Nickel
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2015
• 出版时间：July 16, 2015
• 年：2015
• 卷：6
• 期：14
• 页码：2745-2750
• 全文大小：326K
• ISSN：1948-7185

文摘

Perovskite solar cells with transparent contacts may be used to compensate for thermalization losses of silicon solar cells in tandem devices. This offers a way to outreach stagnating efficiencies. However, perovskite top cells in tandem structures require contact layers with high electrical conductivity and optimal transparency. We address this challenge by implementing large-area graphene grown by chemical vapor deposition as a highly transparent electrode in perovskite solar cells, leading to identical charge collection efficiencies. Electrical performance of solar cells with a graphene-based contact reached those of solar cells with standard gold contacts. The optical transmission by far exceeds that of reference devices and amounts to 64.3% below the perovskite band gap. Finally, we demonstrate a four-terminal tandem device combining a high band gap graphene-contacted perovskite top solar cell (E_g = 1.6 eV) with an amorphous/crystalline silicon bottom solar cell (E_g = 1.12 eV).