Journal Article

FZJ-2022-05598

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Nano-LED driven phase change evolution of layered chalcogenides for Raman spectroscopy investigations

Mikulics, M. (Corresponding author)FZJ* ; Adam, R.FZJ* ; Roman Sobolewski ; Heidtfeld, S.FZJ* ; Cao, D. ; Bürgler, D. E.FZJ* ; Schneider, C. M.FZJ* ; Mayer, J.FZJ* ; Hardtdegen, H. H. (Corresponding author)FZJ*

2022
Elsevier Amsterdam

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Please use a persistent id in citations: http://hdl.handle.net/2128/33343  doi:10.1016/j.flatc.2022.100447

Abstract: We present a device driving testing platform based on vertically integrated nano light emitting diodes (nano- LEDs). The nano-LEDs with a peak wavelength emission centered at ~ 445 nm were arranged in arrays and conditioned using a laser-micro-annealing process to individually tune their intensity. They were coupled with freestanding monocrystalline Ge1Sb2Te4 nano-membranes with three different thicknesses (~40, ~ 60 and ~ 90 nm) with the aim of initializing ultrafast switching processes and of observing phase changed states simulta- neously by Raman spectroscopy. Raman spectroscopy studies reveal that the optical pulses emitted from the nano-LEDs induce substantial, local changes in the nano-membranes’ states of the Ge1Sb2Te4 layered material. Beside the crystalline state in non-exposed areas (as-grown material), amorphous and different intermediate states were identified in exposed areas as island-like structures with diameters ranging from ~ 300 nm up to ~ 1.5 µm. The latter confirms the nano-LEDs’ emission role in both near- and far-field regimes, depending on the distance between nano-LED and nano-membrane, for driving i.e. inducing the phase change process. The results presented demonstrate the suitability and potential of the vertically integrated nano-LEDs as the key components for a testing platform/for electro-optical convertors driving phase change processes in optically active media. They could also play an important role in the development of future, e.g., non-volatile data storage as well as in optical and neuromorphic computing architectures based on transmistor devices.

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Contributing Institute(s):

1. Materialwissenschaft u. Werkstofftechnik (ER-C-2)
2. Elektronische Eigenschaften (PGI-6)

Research Program(s):

1. 5353 - Understanding the Structural and Functional Behavior of Solid State Systems (POF4-535) (POF4-535)

Appears in the scientific report 2022

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; IF >= 5 ; JCR ; SCOPUS ; Web of Science Core Collection

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