TY  - JOUR
AU  - Mikulics, Martin
AU  - Adam, Roman
AU  - Roman Sobolewski
AU  - Heidtfeld, Sarah
AU  - Cao, Derang
AU  - Bürgler, Daniel E.
AU  - Schneider, Claus M.
AU  - Mayer, Joachim
AU  - Hardtdegen, Hilde Helen
TI  - Nano-LED driven phase change evolution of layered chalcogenides for Raman spectroscopy investigations
JO  - FlatChem
VL  - 36
SN  - 2452-2627
CY  - Amsterdam
PB  - Elsevier
M1  - FZJ-2022-05598
SP  - 100447 -
PY  - 2022
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000897552600004
DO  - DOI:10.1016/j.flatc.2022.100447
UR  - https://juser.fz-juelich.de/record/912414
ER  -