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Berlin 2018 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 50: HL Poster IV

HL 50.35: Poster

Thursday, March 15, 2018, 19:00–21:00, Poster B

Liquide phase crystallized silicon for tandem cell application — •Martina Trahms1, Natalie Preissler2, Cham Thi Trinh1, Bernd Rech1, and Daniel Amkreutz11Institute for Silicon Photovoltaics, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Berlin, Germany — 2PVcomB, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Berlin, Germany

Silicon Photovoltaic has been approaching the theoretical Shockley-Queisser limit of energy conversion efficiency over the last decades. For that reason, the reduction of material usage and production cost becomes more important. An approach to that challenge consists in thin film technologies, among which Liquid Phase Crystallized Silicon (LPC-Si) is a promising candidate with relatively high efficiencies and the potential of low cost production. The idea to boost the efficiencies in tandem devices became especially important as Perovskites emerged for top cell application.

In this contribution we present tandem-concepts for two and four terminal devices. Optical simulations show that theoretically efficiencies up to 23 % are possible on thin-film LPC-Si/Perovskite tandem devices. First experiments involving Perovskite filters show that there is much room for improvement on both the Silicon and Perovskite side.

Investigations of the interface at the pn-junction in the LPC-Si cells show that especially Carbon and Nitrogen impurities can be responsible for defects and high recombination at that interface. Furthermore stacking faults and grain boundaries serve as recombination centers in this polycrystalline material.

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