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Scanning Tunneling Spectroscopy Method for the Prediction of Semiconductor Heterojunction Performance as a Prequel

Thiago C Ribeiro1, Daniel H S Fonseca1, Rafael Reis Barreto1

  • 1Departament of Physics, Federal University of Minas Gerais, Belo Horizonte, MG 30123-970, Brazil.

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Summary

Predicting solar cell performance is key. Scanning tunneling spectroscopy (STS) reveals doping variations in germanium sulfide (GeS) and tin disulfide (SnS2) thin films, identifying limitations before device fabrication.

Keywords:
2D materialsscanning tunneling microscopy and spectroscopysemiconductorssolar cellsvapor transport deposition

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Device Physics

Background:

  • Semiconductor device performance prediction is challenging.
  • Anticipating device specifications before fabrication is crucial for efficiency.
  • Understanding material properties is vital for novel solar cell development.

Purpose of the Study:

  • Investigate constituents of a solar cell using scanning tunneling microscopy (STM) and spectroscopy (STS).
  • Identify spatial distribution of dopant types in germanium sulfide (GeS) and tin disulfide (SnS2) thin films.
  • Determine intrinsic limitations for solar cell efficiency prior to processing.

Main Methods:

  • Employing scanning tunneling microscopy (STM) and spectroscopy (STS) to analyze thin films.
  • Generating separate STS maps for each semiconductor film.
  • Conducting statistical analysis of band gap and doping distribution.
  • Fabricating a solar cell using GeS and SnS2 via vapor phase deposition.
  • Characterizing devices using J-V curves under dark/illuminated conditions.

Main Results:

  • Identified spatial distribution of p-doping in GeS and n-doping in SnS2.
  • Determined intrinsic limitations for solar cell efficiency due to doping fluctuation.
  • Observed stable photocurrent responses despite reduced efficiency.
  • Quantum efficiency measurements showed peak efficiency in a novel range.

Conclusions:

  • STS method can predict intrinsic limitations in novel material junctions.
  • Doping fluctuations due to defects, roughness, or segregation impact device efficiency.
  • The developed STS approach serves as a valuable tool for preemptive solar cell development.
  • The study highlights the potential of GeS/SnS2 heterojunctions for specific solar energy applications.