Photo of Saptarshi Das

Saptarshi Das

Assistant Professor


  • Engineering Science and Mechanics
  • Law, Policy, and Engineering

N-333 Millennium Science Complex


Personal or Departmental Website

Research Areas:

Advanced Materials and Devices; LPE Academic Working Group; LPE Research Working Group




  • BE, Jadavpur University, 2007
  • Ph D, Micro and Nanoelectronics, Purdue University, 2013


Parts of Book

  • Joerg Appenzeller, Feng Zhang, Saptarshi Das and Joachim Knoch, 2016, Transition metal dichalcogenide Schottky barrier transistors, CRC Press, United Kingdom

Journal Articles

  • Parijat Sengupta and Saptarshi Das, 2020, "Photon-assisted heat engines in the THz regime", Journal of Applied Physics, 127, (2)
  • Azimkhan Kozhakhmetov, Joseph R Nasr, Zhang Fu, Ke Xu, Natalie Briggs, Rafik Addou, Robert Wallace, Susan K Fullerton-Shirey, Mauricio M Terrones, Saptarshi Das and Joshua A Robinson, 2019, "Scalable BEOL compatible 2D tungsten diselenide", 2D Materials, 7, (1)
  • Amritanand Sebastian, Andrew Pannone, Shiva S Radhakrishnan and Saptarshi Das, 2019, "Gaussian Synapses for Probabilistic Neural Networks", Nature Communications, 10, (1)
  • Sarbashis Das, Akhil Dodda and Saptarshi Das, 2019, "A biomimetic 2D transistor for audiomorphic computing", Nature Communications, 10, (1)
  • Dheyaa Alameri, Joseph R Nasr, Devon Karbach, Yuzi Liu, Ralu Divan, Saptarshi Das and Irma Kuljanishvili, 2019, "Mask-free patterning and selective CVD-growth of 2D-TMDCs semiconductors", Semiconductor Science and Technology, 34, (8)
  • Fu Zhang, Yanfu Lu, Daniel S Schulman, Tianyi Zhang, Kazunori Fujisawa, Zhong Lin, Yu Lei, Ana L Elias, Saptarshi Das, Susan Sinnott and Humberto Terrones Maldonado, 2019, "Carbon doping of WS2 monolayers: Bandgap reduction and p-type doping transport", Science Advances, 5, (5)
  • Joseph R Nasr and Saptarshi Das, 2019, "Seamless Fabrication and Threshold Engineering in Monolayer MoS2 Dual-Gated Transistors via Hydrogen Silsesquioxane", Advanced Electronics Materials, 5, (4)
  • Akshay Wali, Akhil Dodda, Yang Wu, Andrew Pannone, Likhith K Reddy, Sahin K Ozdemir, Ibrahim T Ozbolat and Saptarshi Das, 2019, "Biological physically unclonable function", Communications Physics, 2, (1)
  • Andrew J Arnold, Tan Shi, Igor Jovanovic and Saptarshi Das, 2019, "Extraordinary Radiation Hardness of Atomically Thin MoS2", ACS Applied Materials & Interfaces, 11, (8)
  • Xiaotian Zhang, Fu Zhang, Yuanxi Wang, Daniel S Schulman, Tianyi Zhang, Anushka Bansal, Nasim Alem, Saptarshi Das, Vincent H Crespi, Humberto Terrones Maldonado and Joan M Redwing, 2019, "Defect-Controlled Nucleation and Orientation of WSe2 on hBN: A Route to Single-Crystal Epitaxial Monolayers", ACS Nano, 13, (3)
  • Akhil Dodda, Akshay Wali, Yang Wu, Andrew Pannone, Likhith K Reddy, Arnab Raha, Sahin K Ozdemir, Ibrahim T Ozbolat and Saptarshi Das, 2019, "Biological One-Way Functions for Secure Key Generation", Advanced Theory and Simulations, 2, (2)
  • Natalie Briggs,, Shruti Subramanian, Zhong Lin, Xufan Lei, Xiaotian Zhang, Kehao Zhang, Kai Xiao, David Geohegan, Robert M Wallace, Long-Qing Chen, Mauricio Terrones Maldonado, Seyedehaida Ebrahimi, Saptarshi Das, Joan M Redwing, Christopher Hinkle, Kasra Momeni, Adrianus C van Duin, Vincent H Crespi, Swastik Kar and Joshua A Robinson, 2019, "A roadmap for electronic grade 2D materials", 2D Materials, 6, (2), pp. 022001
  • Amritanand Sebastian, Fu Zhang, Akhil Dodda, Dan May-Rawding, He Liu, Tianyi Zhang, Humberto Terrones Maldonado and Saptarshi Das, 2019, "Electrochemical Polishing of Two-Dimensional Materials", ACS Nano, 13, (1)
  • Joseph R Nasr, Daniel S Schulman, Amritanand Sebastian, Mark W Horn and Saptarshi Das, 2019, "Mobility Deception in Nanoscale Transistors: An Untold Contact Story", Advanced Materials, 31, (2)
  • Anjali Kumar, Amritanand Sebastian, Saptarshi Das and Emilie Ringe, 2018, "In Situ Optical Tracking of Electroablation in Two-Dimensional Transition-Metal Dichalcogenides", ACS Applied Materials and Interfaces, 10, (47), pp. 40773-40780
  • Nicholas A Simonson, Joseph R Nasr, Shruti Subramanian, Bhakti Jariwala, Rui Zhao, Saptarshi Das and Joshua A Robinson, 2018, "Low-temperature metalorganic chemical vapor deposition of molybdenum disulfide on multicomponent glass substrates", FlatChem, 11
  • Tarak K Patra, Fu Zhang, Daniel S Schulman, Henry Chan, Mathew J Cherukara, Mauricio Terrones, Saptarshi Das, Badri Narayanan and Subramanian KRS Sankaranarayanan, 2018, "Defect Dynamics in 2-D MoS2 Probed by Using Machine Learning, Atomistic Simulations, and High-Resolution Microscopy", ACS Nano, 12, (8)
  • Zhong Lin, Yu Lei, Shruti Subramanian, Natalie Briggs, Yuanxi Wang, Chun-Li Lo, Eilam Yalon, David Lloyd, Sanfeng Wu, Kristie Koski, Richard Clark, Saptarshi Das, Robert M Wallace, Thomas Kuech, Joseph S Bunch, Xiaoqin Li, Zhihong Chen, Eric Pop, Vincent H Crespi, Joshua A Robinson and Mauricio Terrones Maldonado, 2018, "Research Update: Recent progress on 2D materials beyond graphene: From ripples, defects, intercalation, and valley dynamics to straintronics and power dissipation", APL Materials, 6, (8), pp. 080701
  • Mathew J Cherukara, Daniel S Schulman, Kiran R Sasikumar, Andrew J Arnold, Henry Chan, Sridhar Sadasivam, Wonsuk Cha, Jorg Maser, Saptarshi Das, Subramanian KRS Sankaranarayanan and Ross J Hardar, 2018, "Three-Dimensional Integrated X-ray Diffraction Imaging of a Native Strain in Multi-Layered WSe2", Nano Letters, 18, (3)
  • Daniel S Schulman, Andrew J Arnold and Saptarshi Das, 2018, "Contact engineering for 2D materials and devices", Chemical Society Reviews, 47, (9)
  • Parijat Sengupta, Saptarshi Das and Junxia Shi, 2018, "The electrothermal conductance and heat capacity of black phosphorus", The Journal of Chemical Physics, 148, (10)
  • Daniel S Schulman, Dan May Rawding, Fu Zhang, Drew Buzzell, Nasim Alem and Saptarshi Das, 2018, "Superior Electro-Oxidation and Corrosion Resistance of Monolayer Transition Metal Disulfides", ACS Applied Materials and Interfaces, 10, (4), pp. 4285-4294
  • Daniel S Schulman, Amritanand Sebastian, Drew Buzzell, Andrew Joseph Arnold and Saptarshi Das, 2017, "Facile Electrochemical Synthesis of 2D Monolayers for High-Performance Thin-Film Transistors", ACS Applied Materials and Interfaces, 9, (51), pp. 44617-44624
  • Yu-Ting Huang, Akhil Dodda, Daniel S Schulman, Amritanand Sebastian, Fu Zhang, Drew Buzzell, Mauricio Terrones, Shien-Ping Feng and Saptarshi Das, 2017, "Anomalous Corrosion of Transition Metal Diselenides Leading to Stable Monolayers", ACS Applied Materials and Interfaces, 9, (44), pp. 39059-39068
  • Daniel S Schulman, Andrew J Arnold, Ali Razavieh, Joseph R Nasr and Saptarshi Das, 2017, "A Review of Two Dimensional Heterostructures", IEEE Nanotechnology Magazine, 11, (2)
  • Andrew J Arnold, Ali Razavieh, Joseph R Nasr, Daniel S Schulman, Chad M Eichfeld and Saptarshi Das, 2017, "Mimicking Neurotransmitter Release in Chemical Synapses via Hysteresis Engineering in MoS2 Transistors", ACS Nano, 11, (3)
  • Saptarshi Das, 2016, "Two Dimensional Electrostrictive Field Effect Transistor (2D-EFET): A sub-60mV/decade Steep Slope Device with High ON current", Scientific Reports, 6, (34811)
  • Saptarshi Das, Mrinal K Bera, Sheng Tong, Badri Narayanan, Ganesh Kamath, Anil Mane, Arvydas P Paulikas, Mark R Antonio, Subramanian Sankaranarayanan and Andreas Roelofs, 2016, "A Self-Limiting Electro-Ablation Technique for the Top-Down Synthesis of Large-Area Monolayer Flakes of 2D Materials", Scientific Reports, 6, (28195)
  • Y L Wang, L R Thoutam, Z L Xiao, J Hu, Saptarshi Das, J Q Mao, J Wei, R Divan, A Luican-Mayer, G W Crabtree and W K Kwok, 2015, "Origin of the turn-on temperature behavior in WTe2", Physical Review B, 92, (18), pp. 180402
  • Ganesh R Bhimanapati, Zhong Lin, Vincent Meunier, Yeonwoong Jung, Judy Cha and Saptarshi Das, 2015, "Recent Advances in Two-Dimensional Materials beyond Graphene", ACS Nano, 9, (12), pp. 11509–11539
  • L R Thoutam, Y L Wang, Z L Xiao, Saptarshi Das, A Luican-Mayer, R Divan, G W Crabtree and W K Kwok, 2015, "Temperature-Dependent Three-Dimensional Anisotropy of the Magnetoresistance in WTe2", Physical Review Letters, 115, (4), pp. 046602
  • Saptarshi Das, Joshua A Robinson, Madan Dubey, Humberto Terrones and Mauricio Terrones Maldonado, 2015, "Beyond graphene: Progress in novel two-dimensional materials and van der waals solids", Annual Review of Materials Research, 45, pp. 1-27
  • Saptarshi Das, Wei Zhang, Laxman Raju Thoutam, Zhili Xiao, Axel Hoffmann, Marcel Demarteau and Andreas Roelofs, 2015, "A Small Signal Amplifier Based on Ionic Liquid Gated Black Phosphorous Field Effect Transistor", IEEE Electron Device Letters, 36, (6), pp. 621-623
  • Saptarshi Das, Marcel Demarteau and Andreas Roelofs, 2015, "Nb-doped single crystalline MoS2 field effect transistor", Applied Physics Letters, 106, (17), pp. 173506
  • Suprem R Das, Jiseok Kwon, Abhijith Prakash, Collin J Delker, Saptarshi Das and David B Janes, 2015, "Low-frequency noise in MoSe2 field effect transistors", Applied Physics Letters, 106, (8), pp. 083507
  • Saptarshi Das, Marcel Demarteau and Andreas Roelofs, 2014, "Ambipolar Phosphorene Field Effect Transistor", ACS Nano, 8, (11), pp. 11730–11738
  • Saptarshi Das, Wei Zhang, Marcel Demarteau, Axel Hoffmann, Madan Dubey and Andreas Roelofs, 2014, "Tunable transport gap in phosphorene", Nano Letters, 14, (10), pp. 5733-5739
  • Richard Gulotty, Saptarshi Das, Yuzi Liu and Anirudha V Sumant, 2014, "Effect of hydrogen flow during cooling phase to achieve uniform and repeatable growth of bilayer graphene on copper foils over large area", Carbon, 77, pp. 341-350
  • Saptarshi Das, Madan Dubey and Andreas Roelofs, 2014, "High gain, low noise, fully complementary logic inverter based on bi-layer WSe2 field effect transistors", Applied Physics Letters, 105, (8), pp. 083511
  • Ali Razavieh, Parsian Katal Mohseni, Kyooho Jung, Saumitra Mehrotra, Saptarshi Das, Sergey Suslov, Xiuling Li, Gerhard Klimeck, David B Janes and Joerg Appenzeller, 2014, "Effect of Diameter Variation on Electrical Characteristics of Schottky Barrier Indium Arsenide Nanowire Field-Effect Transistors", ACS Nano, 6, (8), pp. 6281-6287
  • Saptarshi Das, Richard Gulotty, Anirudha V Sumant and Andreas Roelofs, 2014, "All two-dimensional, flexible, transparent, and thinnest thin film transistor", Nano Letters, 14, (5), pp. 2861-2866
  • Saptarshi Das, Abhijith Prakash, Ramon Salazar and Joerg Appenzeller, 2014, "Toward Low-Power Electronics: Tunneling Phenomena in Transition Metal Dichalcogenides", ACS Nano, 8, (2), pp. 1681-1689
  • Saptarshi Das and Joerg Appenzeller, 2013, "WSe2 field effect transistors with enhanced ambipolar characteristics", Applied Physics Letters, 103, (10), pp. 103501
  • Saptarshi Das and Joerg Appenzeller, 2013, "Where Does the Current Flow in Two-Dimensional Layered Systems?", Nano Letters, 13, (7), pp. 3396–3402
  • Saptarshi Das and Joerg Appenzeller, 2013, "Screening and interlayer coupling in multilayer MoS2", physica status solidi (RRL)-Rapid Research Letters, 7, (4), pp. 268-273
  • Saptarshi Das, Hong-Yan Chen, Ashish Verma Penumatcha and Joerg Appenzeller, 2013, "High Performance Multi-layer MoS2 Transistors with Scandium Contacts", Nano Letters, 13, (1), pp. 100-105
  • Saptarshi Das and Joerg Appenzeller, 2012, "On the scaling behavior of organic ferroelectric copolymer PVDF-TrFE for memory application", Organic Electronics, 13, (12), pp. 3326-3332
  • Joshua T Smith, Saptarshi Das and Joerg Appenzeller, 2011, "Broken-Gap Tunnel MOSFET: A Sub-60mV/decade Transistor with a Constant Inverse Subthreshold Slope", IEEE Electron Device Letters, 32, (10), pp. 1367-1369
  • Saptarshi Das and Joerg Appenzeller, 2011, "On the importance of bandgap formation in graphene for analog device applications", IEEE Transactions on Nanotechnology, 10, (5), pp. 1093-1098
  • Saptarshi Das and Joerg Appenzeller, 2011, "FETRAM-An Organic Ferroelectric Material Based Novel Random Access Memory Cell", Nano Letters, 11, (9), pp. 4003-4007
  • Joshua T Smith, Christian Sandow, Saptarshi Das, Renato A Minamisawa, Siegfried Mantl and Joerg Appenzeller, 2011, "Silicon Nanowire Tunneling Field-Effect Transistor Arrays: Improving Subthreshold Performance Using Excimer Laser Annealing", IEEE Transaction on Electron Device, 58, (7), pp. 1822 - 1829

Research Projects

  • February 2017 - January 2020, "YIP: Investigation of Scalability and Reliability of Contacts to Two Dimensional Layered Semiconductors," (Sponsor: Air Force Office of Scientific Research).
  • October 2016 - September 2019, "E2CDA: Type II: 2D Electrostrictive FETs for Ultra-Low Power Circuits and Architectures," (Sponsor: National Science Foundation).
  • November 2017 - July 2018, "Electroluminescent Cells Switched by Interdigitate Electrode," (Sponsor: PPG Industries).
  • October 2016 - September 2017, "E2CDA: Type II: 2D Electrostrictive FETs for Ultra-Low Power Circuits and Architectures," (Sponsor: Nanoelectronics Research Corporation).
  • June 2016 - October 2017, "Graphene/2D materials growth and properties on Corning substrates," (Sponsor: Corning, Incorporated).
  • January 2016 - June 2016, "Electrochemical Synthesis of 2D Nanosheets," (Sponsor: Argonne National Laboratory).

Honors and Awards

  • Young Investigator Award, Air Force Office of Scientific Research, February 2017 - January 2020


Service to Penn State:

Service to External Organizations:




The Penn State Department of Engineering Science and Mechanics (ESM) is an internationally distinguished department that is recognized for its globally competitive excellence in engineering and scientific accomplishments, research, and educational leadership.

Our Engineering Science program is the official undergraduate honors program of the College of Engineering, attracting the University’s brightest engineering students. We also offer graduate degrees in ESM, engineering mechanics, engineering at the nano-scale, and an integrated undergraduate/graduate program.

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