Regensburg 2016 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 16: High Efficiency Photovoltaics (joint session AKE/CPP, organized by AKE)
CPP 16.2: Topical Talk
Dienstag, 8. März 2016, 10:00–10:30, H3
Monolithic perovskite/silicon-heterojunction tandem solar cells processed at low temperature — •Steve Albrecht1, M. Saliba2, J.P. Correa Baena2, F. Lang1, L. Korte1, R. Schlatmann1, M. K. Nazeeruddin2, A. Hagfeldt2, M. Grätzel2, and B. Rech1 — 1Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Institut für Silizium-Photovoltaik, Kekuléstraße 5, 12489 Berlin, Germany — 2Laboratory for Photonics Swiss Federal Institute of Technology (EPFL), Station 6, Lausanne, CH 1015, Switzerland
Tandem solar cells combining silicon and perovskite absorbers have the potential to outperform state-of-the-art high efficiency silicon single junction devices. However, the practical fabrication of monolithic silicon/perovskite tandem solar cells is challenging as material properties and processing requirements restrict the device design. We achieve a tandem cell efficiency of 19.9% with an open circuit voltage of 1.78 V for the reverse scan direction with a stabilized power output of 18.1% which is one the highest reported values to date. The monolithic integration was realized via low temperature processing of the semitransparent perovskite sub-cell. The tandem cell design is currently limited by the photocurrent generated in the silicon bottom cell that is reduced due to reflectance losses. Based on optical modelling and first experiments, we show that these losses can be significantly reduced by combining optical optimization including light trapping approaches. Therefore, this study highlights the great potential of monolithic silicon heterojunction/perovskite tandem solar cells.