Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 72: Poster Wednesday: Scanning Probe Techniques

O 72.7: Poster

Mittwoch, 3. April 2019, 17:45–20:00, Poster B2

Design of a low-temperature scanning tunneling microscope for detection of single-molecule light emission — •Tzu-Chao Hung, Brian Kiraly, Alexander A. Khajetoorians, and Daniel Wegner — Radboud University, Institute for Molecules and Materials (IMM), 6500 GL Nijmegen, The Netherlands

Phosphorescent triplet-emitter molecules are promising candidates for highly efficient OLEDs, but it is not well understood how the optoelectronic properties are altered when they are embedded in a device environment. In order to fundamentally study such dependences with atomic-scale resolution, we upgraded a low-temperature STM (T= 4K) to detect tip-induced light emission from the tunnel junction. An in-situ lens is placed close to the tunnel junction to collimate the light out of the ultrahigh vacuum system into a fiber coupler. The end of the fiber is either guided to a spectrometer with an LN2-cooled CCD detector or to a single photon counting module. This way, we are able to simultaneously study the structure, electronic properties and light-emission spectra of single molecules down to submolecular resolution and with photon yields down to few counts per second. We will present the design and performance of the setup and show preliminary results on single-molecule light emission of ZnPc molecules.