Contact

Phone: 470-578-3431

Email: kpemasir@kennesaw.edu

Office Location: E 130

Office Hours:
Mondays from 2:30 -3:30 PM Tuesdays, Wednesdays and Fridays from 12:30 - 1:30 PM Thrusdays from 1:00 - 2:00 PM Or by appoinments.

Research

My research primarily focuses on semiconductor nanostructures, with extensive experience in photoluminescence, time-resolved photoluminescence, and photocurrent spectroscopy to study the band structure of materials, particularly InP nanowires. During my Ph.D., I explored the phase-dependent properties (zincblende and wurtzite) of InP nanowires, observing quantum confinement and polarization anisotropy. I also gained expertise in photolithography, cryogenics, high-power lasers, and nanodevice fabrication, complemented by theoretical modeling using electrodynamics and quantum mechanics.

Following my Ph.D., I shifted focus to applied research, including solar cell technologies such as thin-film and dye-sensitized solar cells, collaborating on graphene-based counter electrodes and thermoelectric device modeling. I have also mentored graduate students and maintain an interest in Physics Education Research, aiming to explore innovative teaching methodologies in physics.

 

Following are the list of my publications
Journal Publications

  1. Strategic graphene integration in multilayer photoanodes for enhanced quasi-solid-state dye-sensitized solar cells and performance under variable irradiance, TMWJ Bandara, SMS Gunathilake, GGDMG Gamachchi, BMK Pemasiri, L Ajith DeSilva, MAKL Dissanayake, GRA Kumara, Journal of Applied Electrochemistry (2024) 1-17.
  2. A review of the development of graphene-incorporated dye-sensitized solar cells, TMWJ Bandara, SMS Gunathilake, MAKL Dissanayake, BMK Pemasiri, I Albinsson, B-E Mellander, Springer Berlin Heidelberg (2024) 1-21.
  3. Strategic Integration of Graphene into Multilayer Photoanode; Enhancing Efficiency of Quasi-Solid-State Dye-Sensitized Solar Cells Under Ambient and Low Irradiance, TMWJ Bandara, SMS Gunathilake, GGDMG Gamachchi, BM K Pemasiri, L Ajith DeSilva, MAKL Dissanayake, GRA Kumara, Journal of Applied Electrochemistry (2024).
  4. Dynamic behavior of fluid flow through a downscaled model of Bissokotuwa of ancient reservoirs in Sri Lanka, D.C. Maddumage and B.M.K. Pemasiri, Ceylon Journal of Science 52 (1) (2023) 63-69.
  5. Time-dependent finite-difference model for transient and steady state analysis of thermoelectric bulk materials, R.A. Rathnayake, H. Wijekoon , B.M.K. Pemasiri and N.D. Subasinghe, Physica Scripta, 97 (2022) 125008.
  6. An electrochemical route to exfoliate vein graphite into graphene with black tea, T.M.W.J. Bandara, T.M.A.A.B. Thennakoon, G.G.D.M.G. Gamachchi, L.R.A.K. Bandara, B.M.K. Pemasiri, U. Dahanayake, Materials Chemistry and Physics, 289 (2022) 126450.
  7. Effect of substrate temperature on electrical properties of RGO thin films deposited by atomized spray pyrolysis, D.C. Maddumage, S.A. Panamaldeniya, K.M.M.D.K. Kimbulapitiya, D.N.P.R. Jayakantha, M.A.H.M. Munasinghe, B.M.K. Pemasiri, N. Gunawardhana, B.S. Dassanayake, Materials Research Bulletin, 154 (2022) 111936.
  8. Effect of annealing temperature on electrical properties of RGO thin films deposited by Atomized Spray Pyrolysis, D.C. Maddumage, S.A. Panamaldeniya, K.M.M.D.K. Kimbulapitiya, D.N.P.R. Jayakantha, M.A.H.M. Munasinghe, B.M.K. Pemasiri, N. Gunawardhana, B.S. Dassanayake, Diamond & Related Materials, 120(2021)108712.
  9. Combined effects of rice husk ash and nylon fiber on engineering properties of cement mortar, Lalani Fernando, Karunananda Pemasiri, Buddhika Dassanayake, SN Applied Sciences 2:379 (2020).
  10. Effect of post deposition heat treatment on microstructure parameters, optical constants and composition of thermally evaporated CdTe thin films, PKK Kumarasinghe, A Dissanayake, BMK Pemasiri, BS Dassanayake, Materials Science in Semiconductor Processing 58, 51-60 (2017)
  11. Thermally evaporated CdTe thin films for solar cell applications: Optimization of physical properties, P.K.K. Kumarasinghe, Amila Dissanayake, B.M.K. Pemasiri, B.S. Dassanayake, Materials Research Bulletin 96, 188–195 (2017).
  12. Variation of optical, structural, electrical and compositional properties of thermally evaporated CdTe thin films due to substrate temperature, PKK Kumarasinghe, A Dissanayake, BMK Pemasiri, BS Dassanayake, Journal of Materials Science: Materials in Electronics, 1-8 (2016)
  13. Quantum confinement of excitons in wurtzite InP nanowires, K Pemasiri, HE Jackson, LM Smith, BM Wong, S Paiman, Q Gao, HH Tan, C Jagadish, Journal of Applied Physics 117 (19), 194306 (2015)
  14. MOCVD-grown indium phosphide nanowires for optoelectronics, Paiman Suriati, Gao Qiang, Joyce Hannah, Tan Hark Hoe, Jagadish Chennupati, Kim Yong, Guo Yanan, Pemasiri Kuranananda, Montazeri Mohammad, Jackson Howard, Smith Leigh, Advanced Materials Research 832, 201-205 (2014)
  15. Probing valence band structure in wurtzite InP nanowires using excitation spectroscopy, S. Perera, K. Pemasiri, M.A. Fickenscher, H.E. Jackson, L.M. Smith, J. Yarrison-Rice, S. Paiman, Q. Gao, H.H. Tan, and C. Jagadish, Applied Physics Letters 97, 023106 (2010)
  16. Room Temperature Photocurrent Spectroscopy of Single Zincblende and Wurtzite InP Nanowires, A. Maharjan, K. Pemasiri, P. Kumar, A. Wade, L.M. Smith, H.E. Jackson, J.M. Yarrison-Rice, A. Kogan, S. Paiman, Q. Gao, H.H. Tan, and C. Jagadish, Applied Physics Letters 94, 193115 (2009)
  17. Effect of V/III ratio and catalyst particle size on the crystal structure and optical properties of InP nanowires, S Paiman, Q Gao, H Hoe Tan, Chennupati Jagadish, K Pemasiri, M Montazeri, H E Jackson, L M Smith, J Yarrison-Rice, X Zhang and J Zou, Nanotechnology 20, 225606 (2009)
  18. Carrier dynamics and quantum confinement in Type-II ZB-WZ InP nanowire homostructures, Kuranananda Pemasiri, Mohammad Montazeri, Richard Gass, Leigh M. Smith, Howard E. Jackson, Jan Yarrison-Rice, Suriati Paiman, Qiang Gao, H. Hoe Tan, Chennupati Jagadish, Xin Zhang, and Jin Zou, Nano Letters 9, 648-654 (2009)

Conference Proceedings

  1. Determining wurtzite band structure using optical spectroscopies on single InP nanowires, Karunananda Pemasiri, Saranga Perera, Yuda Wang, Mohammad Montazeri, Howard Jackson, Leigh Smith, Jan Yarrison-Rice, Qian Gao, Hoe Tan, Chennupati Jagadish, AIP Conference Proceedings 1566, 476-477 (2013)
  2. Probing the valence band structure of wurtzite InP nanowires by photoluminescence excitation spectroscopy, HE Jackson, S Perera, K Pemasiri, LM Smith, J Yarrison-Rice, JH Kang, Q Gao, HH Tan, C Jagadish, Y Guo, J Zou, Jisoon Ihm, Hyeonsik Cheong, AIP Conference Proceedings-American Institute of Physics 1399 (1), 481 (2011)
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