Joint School of Nanoscience and Nanoengineering | About JSNN | Our People | Shanthi Iyer

Shanthi Iyer

Professor

Nanoengineering

Email Address: iyer@ncat.edu

Curriculum Vitae

Research

Prof. Iyer has been responsible for initiating and developing NC A&T SU’s state of the art Molecular Beam Epitaxy (MBE) Laboratory and associated academic and research programs. She has been a PI of over $10 million in DoD research projects. She was also the Director of the Center of Excellence for Battlefield Capability Enhancements, which focused on developing technologies for environmentally stable flexible panel displays.

Her current research interests are molecular beam epitaxial (MBE) growth, characterization, and fabrication of GaAsSb(N) nanowire based infrared photodetectors epitaxially integrated into Si and graphene for next-generation photonic devices. This cross-disciplinary research encompasses solid state physics, nanoengineering, and optoelectronic devices.

Courses Taught

  • NANO 702
  • NANO 823
  • NANO 827
  • NANO 852
  • NANO 825

Publications

  1. Hirandeep Kuchoor, Yugwini Deshmukh, Rashmita Baruah, Jia Li, Christopher Winkler, Lew Reynolds, and Shanthi Iyer, “High-responsivity N-I-P axial/core-shell GaAsSb dense Nanowires: A novel integration with graphene substrate for near-infrared photodetectors”, ACS Applied Nanomaterials, 7 (21), 24299-24314 (2024): https://doi.org/10.1021/acsanm.4c01241.)
  2. Rabin Pokharel, Hirandeep Kuchoor, Mehul Parakh, Shisir Devkota, Kendall Dawkins, Priyanka Ramaswamy, Jia Li, Christopher Winkler, Lew Reynolds, and S. Iyer, “A GaAs/GaAsSb core-shell configured nanowire-based avalanche photodiode up to 1.3 µm light detection”, ACS Applied Nanomaterials 2023 (https://doi.org/10.1021/acsanm.2c03644).
  3. S. Devkota*, H. Kuchoor*, K. Dawkins, R. Pokharel, M. Parakh, J. Li, and S. Iyer, “Heterostructure axial GaAsSb ensemble near-infrared p-i-n based axial configured nanowire photodetectors”, Nanotechnology, 2023. https://doi.org/10.1088/1361-6528/acc2c6
  4. Priyanka Ramaswamy, Kendall Dawkins, Hirandeep Kuchoor, Rabin Pokharel, Jia Li, and Shanthi Iyer “MBE-grown hybrid axial core-shell n-i-p GaAsSb heterojunction ensemble nanowires based near infrared photodetectors up to 1.5 µm”, Crystal Growth and Design 22(10) 6004-6014, DOI: 10.1021/acs.cgd.2c00652.
  5. M. Parakh, R. Pokharel, K. Dawkins, S. Devkota, J. Li, and S. Iyer, “Ensemble GaAsSb/GaAs axial configured nanowire-based separate absorption, charge, and multiplication avalanche near-infrared photodetectors”, Nanoscale Advances 4, 3919-3927 (2022). DOI: 10.1039/D2NA00359G
  6. Long Yuan, Rabin Pokharel, Shisir Devkota, Hirandeep Kuchoor, Kendall Dawkins, Min-Cheol Lee, Yue Huang, Dmitry A. Yarotski, Shanthi Iyer and Rohit P. Prasankumar. “Revealing Charge Carrier Dynamics and Transport in Te-doped GaAsSb and GaAsSbN Nanowires by Correlating Ultrafast Terahertz Spectroscopy and Optoelectronic Characterization” , Nanotechnology, 33, 425702 (8 pp).DOI: 10.1088/1361-6528/ac7d61
  7. M. Parakh, P. Ramaswamy, S. Devkota, H. Kuchoor, K. Dawkins and S. Iyer, “Passivation efficacy study of Al2O3 dielectric on self-catalyzed molecular beam epitaxially grown GaAs1-xSbx nanowires”, Nanotechnology 33, 315602 (2022) 10.1088/1361-6528/ac69f8.
  8. Priyanka Ramaswamy, Shisir Devkota, Rabin Pokharel, Surya Nalamati, Fred Stevie, Keith Jones, Lew Reynolds, and Shanthi Iyer, “A Study of Dopant Incorporation in Te – doped GaAsSb Nanowires using a Combination of XPS/UPS, and C-AFM/SKPM” Scientific Reports, 11, 8329 (14 pages) (2021).
  9. Sean Johnson, Rabin Pokharel, Michael Lowe, Hirandeep Kuchoor, Surya Nalamati, Klinton Davis, Hemali Rathnayake, and Shanthi Iyer, “Study of Patterned GaAsSbN Nanowires using Sigmoidal Model”, Scientific Reports, 11, 4651 (13 pages) (2021) https://doi.org/10.1038/s41598-021-83973-9
  10. Surya Nalamati, Manish Sharma, Prithviraj Deshmukh, Jeffrey Kronz, Robert Lavelle, David Snyder, C. Lewis Reynolds Jr., Yang Liu, and Shanthi Iyer, “A Study of GaAs1-xSbx Axial Nanowires Grown on Monolayer Graphene by Ga-Assisted Molecular Beam Epitaxy for Flexible Near Infrared Photodetectors”, ACS Applied Nano Materials, 2 (7), 4528-4537 (2019); DOI: 10.1021/acsanm.9b00893.

Patents

  1. Shanthi Iyer, Jia Li, Prithviraj Deshmukh, Manish Sharma, “High Sb concentration GaAsSb/GaAs(1-x)SbxN/GaAlAs core-shell-shell nanowires”, US Patent No. 12221719B2, Feb. 11, 2025; Filed Jan. 20, 2024.
  2. S.Iyer, Jia Li, Prithviraj Deshmukh, and Manish Sharma “High Sb Concentration GaAsSb/GaAs(1-x)SbxN/GaAlAs Core-Shell –Shell Nanowires”, US Patent No. 11,905,622, Feb. 20, 2024; U.S. Serial No. 17/229,066- – Publication No.US2021/0317598 A1, Pub. Date: Oct.14, 2021,Filed; April 13, 2021.
  3. S.Iyer, Surya Nalamati and Jia Li, “GaAs1-x­Sbx Nanowires on a Graphitic Substrate”US Patent No. 11,384,286, July 12, 2022; U.S. Serial No. 17/038,175 – Publication No.:US 2021/0095199 A1, Pub. Date 04/01/2021 Filed: September 30, 2020

Awards & Honors

  • 2024/5 Member of a Patent Award Winning Team, NCA&TSU
  • 2024 Advising Excellence Award (NCA&TSU) for being Advisor to the recipient of the Outstanding Thesis Award
  • 2023 Intellectual Property Award, University award and Nanoengineering Departmental Award
  • 2022 Joint School of Nanoscience and Nanoengineering Teaching Award in Nanoengineering
  • 2019 Advising Excellence Award (NCA&TSU) for being Advisor to the Outstanding Dissertation Award
  • BEYA 2018 STEM Innovation Award.
  • Outstanding Senior Researcher Award –2006/7 (NCA&TSU and College of Engineering)
  • Excellence in Research in College of Engineering Award-1993 (NCA&TSU).

Keywords

Molecular beam epitaxy, photonics, photodetectors, III-V compound semiconductors, Nanowires and optoelectronic devices

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