Regensburg 2019 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 19: Hybrid and Perovskite Photovoltaics II

CPP 19.1: Vortrag

Dienstag, 2. April 2019, 09:30–09:45, H18

Three-Terminal Perovskite Silicon Tandem Solar Cells with Top and Interdigitated Rear Contacts — •Philipp Tockhorn, Philipp Wagner, Johann Christoph Stang, Lukas Kegelmann, Mathias Mews, Steve Albrecht, and Lars Korte — Helmholtz Zentrum Berlin, Kekuléstraße 5, 12489 Berlin

So far, perovskite and silicon were paired in two terminal (2T) and four terminal (4T) tandems, yielding power conversion efficiencies (PCE) above 25 %. In a 2T tandem solar cell, the total current density is limited by the subcell yielding the lower current, restricting the overall performance. Independently operated 4T tandem cells need additional transparent conductive layers for lateral conduction and thus parasitic absorption is ultimately higher. Here, we present a novel three terminal (3T) approach for the interconnection of an n-i-p perovskite top cell with an interdigitated back contact (IBC) silicon heterojunction (SHJ) bottom cell. For this, the interconnection of the subcells is realised with SnO2 and nc-Si:H(n) layers. This allows the independent operation of both subcells in a monolithic device, thus combining the advantages of both 2T and 4T devices into a 3T tandem solar cell. For this, electrons generated in the perovskite top cell are collected at the rear side n-contact of the IBC SHJ. We report the first 3T perovskite/silicon tandem device in this architecture that reaches a combined stabilised PCE of 15.5 %. Despite losses due to hysteresis, our 3T device is still strongly limited by optical losses from high reflection and parasitic absorption. We present the theoretical limits of this tandem approach and highlight further routes to improve efficiency.