PVMD Arno Smets Delft University of Technology Learning objectives - PowerPoint PPT Presentation

Mar 09, 2024 •164 likes •282 views

Amorphous silicon PVMD Arno Smets Delft University of Technology Learning objectives What is amorphous silicon What are the different types of defects in a-Si How does the amorphous structure affect the material properties

Amorphous silicon PVMD Arno Smets Delft University of Technology
Learning objectives • What is amorphous silicon • What are the different types of defects in a-Si • How does the amorphous structure affect the material properties
Source: www.youtube.com/watch?v=OyVUmucwhPo
Amorphous silicon Hydrogenated Single crystal silicon amorphous silicon a-Si :H Defect density: 10 12-14 cm 3 c-Si 10 19 cm 3 a-Si 10 16 cm 3 a-Si:H Si atom Covalent bond Unpassivated dangling bond Hydrogen passivated dangling bond
Defects in a-Si:H
Band diagram E Conduction band E C Band gap E G E V Valence band
Band diagram E mob =1.8 eV direct E G =1.1 eV indirect g V g C g(E) Valence Conduction band tail band tail Defect states E E V,mob E V E C E C,mob
Band diagram E mob =1.8 eV direct E G =1.1 eV indirect c-Si: Indirect bandgap E G =1.1 eV g V g C g(E) a-Si: Direct bandgap conduction E mob =1.8 eV band tail Defect states E E V,mob E V E C E C,mob
Absorption coefficient Wavelength (nm) 2480 1240 827 620 496 413 c-Si: Absorption coefficient (cm -1 ) 10 5 Indirect bandgap E G =1.1 eV 10 4 10 3 c-Si a-Si: 10 2 Direct bandgap a-Si 10 1 a-Si E mob =1.8 eV c-Si 10 0 0.5 1.0 1.5 2.0 2.5 3.0 Photon energy (eV)
c-Si a-Si Indirect bandgap Direct bandgap E G =1.1 eV E mob =1.8 eV E mob E G g V g C g(E) g g(E) g C g V V E E C,mob E E V E C E V,mob

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