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P3HT-graphene bilayer electrode for Schottky junction photodetectors
H Aydın1, S B Kalkan1, C Varlikli2
1Quantum Device Laboratory, Department of Physics, İzmir Institute of Technology, 35430, Izmir, Turkey.
Nanotechnology
|February 16, 2018
Summary
A poly(3-hexylthiophene-2.5-diyl) (P3HT)-graphene bilayer electrode significantly boosts the photoresponsivity of silicon (Si)-based photodetectors. This P3HT-graphene electrode enhances spectral photoresponsivity by over three orders of magnitude.
Area of Science:
- Materials Science
- Optoelectronics
- Nanotechnology
Background:
- Silicon (Si)-based photodetectors are crucial optoelectronic devices.
- Enhancing the photoresponsivity of Si photodetectors is an active area of research.
- Graphene and conductive polymers offer unique electronic and optical properties.
Purpose of the Study:
- To investigate the impact of a poly(3-hexylthiophene-2.5-diyl) (P3HT)-graphene bilayer electrode on Si-based Schottky photodetectors.
- To evaluate the photoresponsivity characteristics, durability, and response speed of these modified photodetectors.
- To understand the underlying mechanisms for photoresponsivity enhancement.
Main Methods:
- Fabrication of Si-based Schottky photodetectors with graphene and P3HT-graphene bilayer electrodes using dip-coating.
- Characterization using UV-vis and Raman spectroscopy to confirm P3HT modification of graphene.
- Electrical measurements including current-voltage and time-resolved photocurrent spectroscopy.
Main Results:
- P3HT-graphene/Si devices exhibited Schottky junction behavior.
- The P3HT-graphene/Si photodetector showed a spectral photoresponsivity increase of over three orders of magnitude compared to graphene/Si.
- Enhanced specific detectivity and noise equivalent power were observed.
- Devices demonstrated excellent durability and fast response speeds.
Conclusions:
- The P3HT-graphene bilayer electrode significantly enhances the photoresponsivity of Si-based photodetectors.
- Charge transfer doping from P3HT to graphene is the primary mechanism for the observed photoresponsivity improvement.
- P3HT-graphene bilayer electrodes are promising functional components for advanced Si-based optoelectronic devices.
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