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Hyperdoping silicon for intermediate band photoconductivity

POSTER

Abstract

Hyperdoped silicon is a promising material for infrared detection. Supersaturated solutions of impurities in Si are produced in order to create intermediate bands (IBs) in between the valence and conduction bands. This new IB serves on sub-band gap absorption. Ion implantation followed by pulsed laser melting has been demonstrated as a method to produce concentrations of impurities in Si that are well above the solid solubility limit. In this work, we look at Si hyperdoped with Au or Ti. To achieve devices that could be commercialized for FPAs or other demanding applications, efficient ones will require significant optical absorption and high quality Ohmic contacts for carrier extraction. We fabricated Si layers hyperdoped with Au or Ti at varying concentrations, measured the optical absorption enhancement relative to Si, and attempted to form Ohmic contacts to the layers. The results show significant enhancement of optical absorption by increasing the implant dose. For making Ohmic contacts to hyperdoped materials, we tried several treatments, including boron or phosphorus shallow doping, rapid thermal annealing of contact, etching off the top metallic layer, and modifying the PLM process to suppress dopant segregation. Recipes for Ohmic contacts to each layer were demonstrated.

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Authors

  • Yining Liu

    University of Dayton

  • Spencer Kirn

    Ohio University, The University of Southern Mississippi, Washington University in St. Louis, Dept. of Physics and Synergetic Innovation Center for Quantum Effects and Applications, Hunan Normal Univ., Institute for Quantum Science and Engineering, Dept. of Physics and Astronomy, Texas A\&M Univ., Institut für Kernphysik, Eckerd College, Iowa State University, Louisiana State University, 13691563688, University of Dayton, Austrilian National University, Benet lab, University of Illinois Urbana-Champaign, The University of Akron, Dept. of Chemistry, Case Western Reserve University, The Ohio State University, Columbus Nanoworks, Department of Chemistry and Biochemistry, Arizona State University, Department of Physics, Arizona State University, Tempe, AZ, College of William and Mary

  • Spencer Kirn

    Ohio University, The University of Southern Mississippi, Washington University in St. Louis, Dept. of Physics and Synergetic Innovation Center for Quantum Effects and Applications, Hunan Normal Univ., Institute for Quantum Science and Engineering, Dept. of Physics and Astronomy, Texas A\&M Univ., Institut für Kernphysik, Eckerd College, Iowa State University, Louisiana State University, 13691563688, University of Dayton, Austrilian National University, Benet lab, University of Illinois Urbana-Champaign, The University of Akron, Dept. of Chemistry, Case Western Reserve University, The Ohio State University, Columbus Nanoworks, Department of Chemistry and Biochemistry, Arizona State University, Department of Physics, Arizona State University, Tempe, AZ, College of William and Mary

  • Spencer Kirn

    Ohio University, The University of Southern Mississippi, Washington University in St. Louis, Dept. of Physics and Synergetic Innovation Center for Quantum Effects and Applications, Hunan Normal Univ., Institute for Quantum Science and Engineering, Dept. of Physics and Astronomy, Texas A\&M Univ., Institut für Kernphysik, Eckerd College, Iowa State University, Louisiana State University, 13691563688, University of Dayton, Austrilian National University, Benet lab, University of Illinois Urbana-Champaign, The University of Akron, Dept. of Chemistry, Case Western Reserve University, The Ohio State University, Columbus Nanoworks, Department of Chemistry and Biochemistry, Arizona State University, Department of Physics, Arizona State University, Tempe, AZ, College of William and Mary

  • Spencer Kirn

    Ohio University, The University of Southern Mississippi, Washington University in St. Louis, Dept. of Physics and Synergetic Innovation Center for Quantum Effects and Applications, Hunan Normal Univ., Institute for Quantum Science and Engineering, Dept. of Physics and Astronomy, Texas A\&M Univ., Institut für Kernphysik, Eckerd College, Iowa State University, Louisiana State University, 13691563688, University of Dayton, Austrilian National University, Benet lab, University of Illinois Urbana-Champaign, The University of Akron, Dept. of Chemistry, Case Western Reserve University, The Ohio State University, Columbus Nanoworks, Department of Chemistry and Biochemistry, Arizona State University, Department of Physics, Arizona State University, Tempe, AZ, College of William and Mary

  • Spencer Kirn

    Ohio University, The University of Southern Mississippi, Washington University in St. Louis, Dept. of Physics and Synergetic Innovation Center for Quantum Effects and Applications, Hunan Normal Univ., Institute for Quantum Science and Engineering, Dept. of Physics and Astronomy, Texas A\&M Univ., Institut für Kernphysik, Eckerd College, Iowa State University, Louisiana State University, 13691563688, University of Dayton, Austrilian National University, Benet lab, University of Illinois Urbana-Champaign, The University of Akron, Dept. of Chemistry, Case Western Reserve University, The Ohio State University, Columbus Nanoworks, Department of Chemistry and Biochemistry, Arizona State University, Department of Physics, Arizona State University, Tempe, AZ, College of William and Mary