Regensburg 2016 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 80: Hybrid and Perovskite Photovoltaics IV (Joint session of CPP, DF, DS and HL, organized by HL)
HL 80.6: Vortrag
Donnerstag, 10. März 2016, 16:00–16:15, H2
Graphene on Hybrid Solar Cells: from Silicon and Perovskite towards Tandem Solar Cells — •Felix Lang, Matthias Zellmeier, Marc A. Gluba, Steve Albrecht, Jörg Rappich, Lars Korte, Bernd Rech, and Norbert H. Nickel — Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Institut für Silizium Photovoltaik, Kekuléstr. 5, 12489 Berlin, Germany
A variety of hybrid solar-cell architectures require the deposition of a highly transparent and conductive contact. However, deposition techniques for conventional transparent conductive oxides typically degrade the topmost organic layers. A non-destructive wet transfer process of large area graphene from the growth substrate onto the desired sample is the clear choice to tackle this challenging problem.
Here, we present for the first time the implementation of graphene on hybrid crystalline silicon/P3HT solar cells. Despite identical VOC and superior external quantum efficiency, device performance is limited by graphene sheet resistance. To overcome this limitation we combined in-situ graphene doping with an absorber with a higher band gap. Both measures reduce the impact on the device performance.
Implementation of graphene on the perovskite CH3NH3PbI3 therefore enabled a semi-transparent device concept showing superior internal quantum efficiency compared to conventional Au-contacted solar cells. The graphene contact enabled an optical sub-band gap transmission of around 60 % for the complete device. This paved the way for the development of a four terminal crystalline silicon/perovskite tandem solar cell with a power conversion efficiency of 13.2 %.