Saptarshi Das, PhD 2. Adjunct Birck Research Scholar Birck Nanotechnology Center Purdue University West Lafayette, Indiana 47907 1.Post-doctoral Research.

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Presentation transcript:

Saptarshi Das, PhD 2. Adjunct Birck Research Scholar Birck Nanotechnology Center Purdue University West Lafayette, Indiana Post-doctoral Research Scholar Division of High Energy Physics Argonne National Laboratory Lemont, Illinois Current Affiliations (June 2013 – Present) 1 2D Crystals – Future of Innovative Devices Division of High Energy Physics

2 h-BN Transition Metal Dichalcogenides Excellent ConductorExcellent Insulator Phosphorene Natural 2D Crystals Excellent Semiconductors Division of High Energy Physics

3 Metals: ScTe 2,TaS 2, etc. Semiconductors: WSe 2, MoS 2, etc. Insulators: PtSe 2,PdS 2, etc. Superconductors: VS 2, NbSe 2, etc. 88 TMDs have been explored since 1960s Periodic Table of Elements Transition Metal Dichalcogenides MX 2 M = Transition Metal X = Chalcogen Natural 2D Crystals Division of High Energy Physics

4 Tunable Electronic Properties Electric Field Mechanical Force Thermal Gradient Thickness Scaling Swastibrata Bhattacharyya, et al. Physical Review B, 86, , 2012 Ashok Kumar, et al. Modeling and Simulation in Material Science and Engineering, 21, , 2012 Division of High Energy Physics Controlled GrowthIntercalation of Ions Detectors Amplifiers Filters Modulators Resonators Engineerable Material Properties

5 Flexible and Transparent Electronics Division of High Energy Physics Strain Effect: Flexibility Without Strain With Strain Device Transparency Active Device on Flexible Substrate WSe 2 Flakes Wireless Detectors Energy Efficient Cost Effective High Performance Thinnest Thin Film Transistor Ever (only 10 atomic layers: 3-4nm) Saptarshi Das, et al. All Two Dimensional, Flexible, Transparent and Thinnest Thin Film Transistor. Nano Letters 14 (5), 2014.

6 Accomplished Work Saptarshi Das. et al. High Performance Multi- layer MoS 2 Transistor with Sc Contacts. Nano Letters, 13(1), Nano Letters Top 20 Cited Article of 2013 Saptarshi Das. et al. WSe 2 FET with Enhanced Ambipolar Characteristics. Applied Physics Letters, 103, Saptarshi Das, et al., Screening and Interlayer Coupling in Multilayer MoS 2 Physica Status Solidi, RRL, 7 (4), Cover Article of the Journal Saptarshi Das, et al. All Two Dimensional, Flexible, Transparent and Thinnest Thin Film Transistor. Nano Letters 14 (5), Saptarshi Das, et al. Where does the Current Flow in the Two Dimensional Layered Systems. Nano Letters, 13 (7), Saptarshi Das. et al. Towards Low Power Electronics: Tunneling Phenomenon in TMDs ACS Nano, 8(2), Division of High Energy Physics

7 Thank You Division of High Energy Physics