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Organic–inorganic heterojunctions for optoelectronic applications

Organic–inorganic heterojunctions for optoelectronic applications

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Various properties of different optimized organic solvents and graphene oxide-doped poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) films, PEDOT:PSS/Si heterojunctions, and solar cells have been studied in detail. The conductivity of PEDOT:PSS films was enhanced by three orders of magnitude with graphene oxide whereas all films remain highly transparent (>85%) in the visible region. The partial removal of PSS and the formation of conducting PEDOT-connected networks contribute to the enhanced electrical conductivity of PEDOT:PSS films. The removal of PSS was also confirmed by CAFM measurements. Solar cell fabricated with ethylene glycol-doped PEDOT:PSS film showed a maximum power conversion efficiency as compared to other solvents-doped PEDOT:PSS film. The highly conducting and transparent material can be used in various future optoelectronic devices.

Chapter Contents:

  • 6.1 Introduction
  • 6.2 Experimental background
  • 6.2.1 Mechanisms of conductivity enhancement
  • 6.2.2 Atomic force microscopy
  • 6.2.2.1 Kelvin probe force microscopy
  • 6.2.2.2 Conductive atomic force microscopy
  • 6.2.3 Sample preparation
  • 6.3 Results and discussion
  • 6.3.1 Thickness and morphology
  • 6.3.2 Surface potential and work function
  • 6.3.3 Conductivity
  • 6.3.4 Raman spectra
  • 6.3.5 Electrical characteristics of PEDOT: PSS/n-Si heterojunction diodes
  • 6.3.6 Photovoltaic characteristics of PEDOT: PSS/n-Si solar cell
  • 6.3.7 Energy band diagram
  • 6.4 Summary
  • Acknowledgments
  • References

Inspec keywords: organic semiconductors; polymer films; semiconductor heterojunctions; silicon; electrical conductivity; graphene compounds; elemental semiconductors; solar cells; conducting polymers; atomic force microscopy

Other keywords: PEDOT-PSS-Si heterojunctions; ethylene glycol-doped PEDOT-PSS film; optoelectronic applications; solar cell; power conversion efficiency; organic-inorganic heterojunctions; CO-Si; optimized organic solvents; graphene oxide-doped poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) films; visible region; CAFM measurements; electrical conductivity; conducting PEDOT-connected networks

Subjects: Electrical properties of semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions; Solar cells and arrays; Semiconductor junctions; Photoelectric conversion; solar cells and arrays

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