Now showing items 1-6 of 6

    • Au-rich filamentary behavior and associated subband gap optical absorption in hyperdoped Si 

      Yang, W.; Akey, Austin; Smillie, L. A.; Mailoa, J. P.; Johnson, B. C.; McCallum, J. C.; Macdonald, D.; Buonassisi, T.; Aziz, Michael J.; Williams, J. S. (American Physical Society (APS), 2017)
      Au-hyperdoped Si, synthesized by ion implantation and pulsed laser melting, is known to exhibit a strong sub-band gap photoresponse that scales monotonically with the Au concentration. However, there is thought to be a ...
    • Deactivation of metastable single-crystal silicon hyperdoped with sulfur 

      Simmons, C. B.; Akey, Austin; Krich, Jacob; Sullivan, Joseph T.; Recht, Daniel; Aziz, Michael J.; Buonassisi, Tonio (AIP Publishing, 2013)
      Silicon supersaturated with sulfur by ion implantation and pulsed laser melting exhibits broadband optical absorption of photons with energies less than silicon's band gap. However, this metastable, hyperdoped material ...
    • Methodology for vetting heavily doped semiconductors for intermediate band photovoltaics: A case study in sulfur-hyperdoped silicon 

      Sullivan, J. T.; Simmons, C. B.; Krich, J. J.; Akey, Austin; Recht, Daniel; Aziz, Michael J.; Buonassisi, T. (AIP Publishing, 2013)
      We present a methodology for estimating the efficiency potential for candidate impurity-band photovoltaic materials from empirical measurements. This methodology employs both Fourier transform infrared spectroscopy and ...
    • Picosecond carrier recombination dynamics in chalcogen-hyperdoped silicon 

      Sher, Meng-Ju; Simmons, Christie B.; Krich, Jacob; Akey, Austin; Winkler, Mark T.; Recht, Daniel; Buonassisi, Tonio; Aziz, Michael J.; Lindenberg, Aaron M. (AIP Publishing, 2014)
      Intermediate-band materials have the potential to be highly efficient solar cells and can be fabricate by incorporating ultrahigh concentrations of deep-level dopants. Direct measurements of the ultrafast carrier recombination ...
    • Single-Phase Filamentary Cellular Breakdown Via Laser-Induced Solute Segregation 

      Akey, Austin; Recht, Daniel; Williams, James S.; Aziz, Michael J.; Buonassisi, Tonio (Wiley-Blackwell, 2015)
      Nanosecond melting and quenching of materials offers a pathway to novel structures with unusual properties. Impurity-rich silicon processed using nanosecond-pulsed-laser-melting is known to produce nanoscale features in a ...
    • Transition-Metal Single Atoms in a Graphene Shell as Active Centers for Highly Efficient Artificial Photosynthesis 

      Jiang, Kun; Siahrostami, Samira; Akey, Austin; Li, Yanbin; Lu, Zhiyi; Lattimer, Judith; Hu, Yongfeng; Stokes, Richard C.; Gangishetty, Mahesh; Chen, Guangxu; Zhou, Yawei; Hill, I. Winfield; Cai, Wen-Bin; Bell, David C.; Chan, Karen; Nørskov, Jens K.; Cui, Yi; Wang, Haotian (Elsevier BV, 2017)
      Utilizing solar energy to fix carbon dioxide (CO2) with water into chemical fuels and oxygen, a mimic process of photosynthesis in nature, is becoming increasingly important but still challenged by the low selectivity and ...