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Jan 21, 2023 •186 likes •290 views

Silicon phases and alloys PVMD Arno Smets Delft University of Technology Learning objectives What are the different phases of silicon What other silicon alloys are used in thin film solar cells How do these alloys improve solar

Silicon phases and alloys PVMD Arno Smets Delft University of Technology
Learning objectives • What are the different phases of silicon • What other silicon alloys are used in thin film solar cells • How do these alloys improve solar cell performance
Silicon phases Decreasing crystalline volume fraction nanocrystalline amorphous Stationary columnar Several 100 nm growth Incubation layer 30-50nm ~ Substrate
Silicon phases Crystallinity Volume fraction of the crystalline phase to the total silicon volume
Nanocrystalline film Matsui et al. Jpn. J. Appl. Phys. 42, L901 (2003)
Silicon alloys VlllA 2 1 He H lllA lVA VA VlA VllA 4.003 5 6 7 8 9 10 a-Si:H B C N O F Ne 10.811 12.011 14.007 15.999 18.998 20.183 nc-Si:H 13 14 15 16 17 18 Al Si P S Cl Ar lB llB a-Si x Ge 1-x :H 26.982 28.086 30.974 32.064 35.453 39.948 29 30 31 32 33 34 35 36 nc-Si x Ge 1-x :H Cu Zn Ga Ge As Se Br Kr 63.54 65.37 69.72 72.59 74.922 78.96 79.909 83.80 a-Si x C 1-x :H 47 48 49 50 51 52 53 34 Ag Cd In Sn Sb Te I Xe 107.870 112.40 114 82 118 69 121.75 127 60 126 904 131 30 nc-Si x O 1-x :H 97 80 81 82 83 84 85 86 Au Hg Tl Pb Bi Po At Rn 196.967 200.59 204.37 207.19 208.980 (210) (210) (222)
Silicon alloy ranges absorption no absorption 2.00 1.75 alloy Band gap (eV) 1.50 P( λ ) (W m -2 nm -1 ) a-Si:H 1.6-1.8 1.25 nc-Si:H 1.1-1.3 1.00 AM 1.5 a-SiGe:H 1.4-1.6 0.75 a-SiC:H >1.9 0.50 nc-SiO:H >2.0 0.25 0.00 500 1000 1500 2000 2500 0 Wavelength (nm)
Micromorph tandem cell a-Si:H nc-Si:H P I N P I N glass _ _ TCO CB a-Si:H p-i-n junction E Fermi + + nc-Si:H p-i-n junction VB Metal back contact 150 - 300 nm 1000 - 2000 nm
Triple junction cell glass TCO 1 a-Si:H p-i-n junction 2 a-SiGe:H p-i-n junction 3 nc-Si:H p-i-n junction Metal back contact 12 1 123
Crystallinity Volume fraction of the crystalline phase to the total silicon volume

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