Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session T60: Poster Session III
Thursday, March 8, 2018
LACC Room: West Hall A
Abstract: T60.00160 : Probing the temperature dependent transport in colloidal MoS2 nanocrystals*
(Advanced Technology Development Centre, Indian Institute of Technology )
(Physics, Indian Institute of Technology)
The quantum confinement effect leads to interesting phenomenon in colloidal MoS2 nanocrystals (NCs), specifically, size-tuneable optical and electronic properties. In addition the ability to be solution processed makes the NCs ideal for commercial flexible and tuneable LEDs, photodetectors, solar cells and transparent electronic devices. In this work, we made temperature dependent (10K-350K) two probe I-V measurements on MoS2 NC assemblies (without gate bias) to estimate parameters (from non-linear fitting) such as mobility, conductivity, activation energy, etc. and study their temperature and size dependence, which showed a transition from Nearest Neighbour Hopping (NNH) at higher temperatures (where Arrhenius like behaviour was seen) to Variable Range Hopping (VRH) at lower temperatures. Spontaneous phase transition of MoS2 from trigonal prismatic to octahedral (which was monitored by X-ray photoelectron spectroscopy, Raman and UV-Vis spectroscopy), and restoration of 2H-phase by ex-situ thermal annealing was also studied. Our results indicate that for microelectronics, 1-T might be more suitable due to its higher mobility over 2-H, which remains the better choice for optoelectronics.
*The authors acknowledge INSPIRE scholarship, DST India for their funding.
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