Berlin 2024 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 47: 2D Materials: Heterostuctures

HL 47.2: Talk

Thursday, March 21, 2024, 15:15–15:30, EW 201

Investigation of electric contacts to 2D semiconductors for optoelectronic and solar energy conversion application — •Ariane Ufer¹, Hendrik Lambers¹, Benjamin Mayer¹, Emeline Nysten¹, Hubert Krenner¹, Rebecca Saive², and Ursula Wurstbauer¹ — ¹Institute of Physics, University of Münster, Münster, Germany — ²MESA+ Institute for Nanotechnology, University of Twente, Enschede, Netherlands

Two-dimensional (2D) semiconducting transition metal dichalcogenides (TMDCs) such as molybdenum disulfide (MoS₂) are of great interest as they exhibit outstanding optoelectronic properties. Due to the highly efficient exciton dominated light-matter interaction, TMDC mono- and multilayers are promising materials for optoelectronic and solar energy conversion applications with the potential to provide lightweight, flexible, versatile, and robust devices. For these applications the contacts between the semiconducting TMDC and the conducting material play a significant role, whereby the major challenge for high power conversion efficiencies (PCE) is the separation and collection of charge carriers. We fabricate semiconductor-metal junctions by transferring MoS₂ mono- and multilayers by dry viscoelastic stamping techniques on top of various nanofabricated metallic contact pads. The samples are characterized via photoluminescence (PL) and Raman spectroscopy. Furthermore, we study the charge transfer across the 2D semiconductor-metal heterojunction using local laser beam induced current measurements.

Keywords: TMDC; photocurrent; solar energy conversion