Research

Refereed Publications

  • D. M. N. M. Dissanayake, A. Ashraf, D. Dwyer, K. Kisslinger, L. Zhang, Y. Pang, H. Efstathiadis and M. D. Eisaman, Spontaneous and strong multi-layer graphene n-doping on soda-lime glass and its application in graphene-semiconductor junctions, Scientific Reports 6, Article number: 21070 (2016) doi:10.1038/srep21070
  • Son Hoang, Ahsan Ashraf, Matthew D. Eisaman, Dmytro Nykypanchuk and Chang-Yong Nam, Enhanced Photovoltaic Performance of Ultrathin Si Solar Cells via Semiconductor Nanocrystal Sensitization: Energy Transfer vs. Optical Coupling Effects, Nanoscale, doi: 10.1039/C5NR07932B (2015).
  • A. Ashraf, D. M. N. M. Dissanayake, M. D. Eisaman, The effect of confinement on the crystalline microstructure of polymer:fullerene bulk heterojunctions, Phys. Chem. Chem. Phys., doi: 10.1039/C5CP03399C (2015).
  • A. Ashraf, D. M. N. M. Dissanayake, M. D. Eisaman, Measuring charge carrier mobility in photovoltaic devices with micron-scale resolution, Appl. Phys. Lett. 106, 113504 (2015).
  • Atikur Rahman, Ahsan Ashraf, Huolin Xin, Xiao Tong, Peter Sutter, Matthew D. Eisaman and Charles T. Black, Sub-50-nm self-assembled nanotextures for enhanced broadband antireflection in silicon solar cells, Nature Communications, 6, 5963 (2015).
  • Ahsan Ashraf, D. M. Nanditha M. Dissanayake, David S. Germack, Conan Weiland, and Matthew D. Eisaman, Confinement-Induced Reduction in Phase Segregation and Interchain Disorder in Bulk Hetereojunction Films, ACS Nano, 8, 323-331 (2014).
  • D. M. N. M. Dissanayake, A. Ashraf, Y. Pang, and M. D. Eisaman, Mapping Spatially Resolved Charge Collection Probability within Bulk Heterojunction Photovoltaics, Advanced Energy Materials, 4, 1300525 (2014).
  • D. M. N. M. Dissanayake, A. Ashraf, Y. Pang, and M. D. Eisaman, Guided-mode quantum efficiency: A novel optoelectronic characterization technique, Rev. Sci. Instrum. 83, 114704 (2012).

Patent Applications

  • Formation of Antireflective Surfaces (link)
  • Hole Blocking, electron transporting window layer for optimized Culn (1-x) Ga (x) Se2 solar cells (link)

Conference Proceedings

  • Ahsan Ashraf, Kristopher O. Davis, Kortan Öğütman, Winston V. Schoenfeld, and Matthew D. Eisaman, Hyperspectral laser beam induced current system for solar cell characterization, Proceedings of the 42nd IEEE Photovoltaic Specialist Conference, New Orleans, LA, June 14-19, 2015. Best Student Paper Finalist
  • N. Dissanayake, A. Ashraf, Y. Pang, and M. D. Eisaman, Hyperspectral guided-mode quantum efficiency: A novel characterization technique for thin-film photovoltaics, Proceedings of the 39th IEEE Photovoltaic Specialists Conference, Tampa, FL, June 16-21, 2013, pp. 1406 - 1411.

Theses

  • Nanoscale Spatial Inhomogeneity in Photovoltaic Devices, PhD Physics, Department of Physics and Astronomy, Stony Brook University (2016).
  • Algebraic Coding Theory, Senior Honors Thesis, Department of Mathematics, Franklin and Marshall College (2010).
  • Quantum Time: Time as a Dynamical Variable, Senior Honors Thesis, Department of Physics, Franklin and Marshall College (2010).