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Silicon surface passivation by PEDOT: PSS functionalized by SnO2 and TiO2 nanoparticles.
M García-Tecedor1,2, S Zh Karazhanov2, G C Vásquez1,2
1Departamento de Física de Materiales, Facultad de CC. Físicas, Universidad Complutense, 28040, Madrid, Spain.
Nanotechnology
|November 28, 2017
Summary
Spin-coated hybrid composite layers effectively passivate silicon surfaces. Functionalizing poly(3,4-ethylenedioxythiophene)/poly-(styrenesulfonate) (PEDOT:PSS) with tin oxide (SnO2) nanoparticles achieved a charge carrier lifetime of 275 μs.
Area of Science:
- Materials Science
- Surface Chemistry
- Nanotechnology
Background:
- Silicon surface passivation is critical for high-performance electronic devices.
- Traditional vacuum-based deposition methods for passivation layers are often costly and time-consuming.
- Developing low-cost, scalable deposition techniques for effective surface passivation is essential.
Purpose of the Study:
- To investigate the efficacy of spin-coated hybrid composite layers for silicon surface passivation.
- To explore the role of semiconducting oxide nanomaterials (TiO2 and SnO2) in functionalizing poly(3,4-ethylenedioxythiophene)/poly-(styrenesulfonate) (PEDOT:PSS).
- To optimize nanoparticle concentration for enhanced passivation performance.
Main Methods:
- Spin coating of PEDOT:PSS and its functionalized variants at room temperature.
- Photoluminescence imaging to characterize the electronic properties of the Si/PEDOT:PSS interface.
- Advanced characterization techniques including XRD, SEM, HRTEM, EDX, and μ-Raman spectroscopy for material analysis.
Main Results:
- Achieved good surface passivation using PEDOT:PSS functionalized with semiconducting oxides.
- Demonstrated that the concentration of semiconducting oxide nanoparticles is crucial for passivation performance.
- Attained a charge carrier lifetime of approximately 275 μs with 0.5 wt.% SnO2 nanoparticles in the composite film.
Conclusions:
- Spin coating offers a cost-effective and efficient method for depositing passivation layers.
- Hybrid composite layers, particularly PEDOT:PSS with SnO2, show significant potential for silicon surface passivation.
- Further optimization of nanoparticle concentration can lead to improved device performance in photovoltaic applications.
