Berlin 2018 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 33: Poster Session III

HL 33.31: Poster

Wednesday, March 14, 2018, 17:30–19:30, Poster F

Towards transparent and flexible photovoltaic devices: optimized growth parameters of NiO/ZnO-based UV solar cells in superstrate configuration — •Fabian Schöppach, Robert Karsthof, Holger von Wenckstern, and Marius Grundmann — Universität Leipzig, Felix-Bloch-Institut für Festkörperphysik, Linnéstraße 5, 04103 Leipzig, Germany

Visible-light transparent solar cells open new areas for photovoltaic energy harvesting, such as on windows, glass roofs or displays of mobile devices. In the work of Karsthof et al. [1], ZnO/NiO heterojuntions were used as prototypes of transparent UV active solar cells. The transparency of these cells is mostly limited by the electrode deposited on top of the p-type NiO contact. Thin metallic layers are usually employed for this purpose.

In this work we present an approach to tackle this by replacing the hitherto used ohmic contact with a tunnel junction between the p-type NiO and a TCO electrode, namely indium tin oxide (ITO). Additionally, the overall structure shall be changed to a superstrate configuration to circumvent the necessity of encapsulation. Moreover, flexible instead of rigid glass substrates were used in order to test for the portability into a roll-to-roll fabrication process. p-type NiO and n-type ZnO were grown on ITO-coated flexible glass substrates by pulsed laser deposition. The cells were characterized by means of optical transparency, X-ray diffraction and both, dark and illuminated current-voltage measurements.

[1] Karsthof et al. physica status solidi (a), 213.1 (2016): 30–37