Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 19, Pages 10228-10237Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b00677
Keywords
nanotextured black silicon; solar cell; silicon nanowire; atomic layer deposition; surface passivation; aluminum oxide (Al2O3); titanium dioxide (TiO2)
Funding
- National Science Council in Taiwan [NSC 103-2112-M-002 -013 -MY3, 103-2218-E-002 -003, 103-2120-M-002 -001]
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In this study, efficient nanotextured black silicon (NBSi) solar cells composed of silicon nanowire arrays and an Al2O3/TiO2 dual-layer passivation stack on the n(+) emitter were fabricated. The highly conformal Al2O3 and TiO2 surface passivation layers were deposited on the high-aspect-ratio surface of the NBSi wafers using atomic layer deposition. Instead of the siligleAl203 passivation layer with a negative oxide charge density, the Al2O3/TiO2 dual-layer passivation stack treated with forming gas annealing provides a high positive oxide charge density and a low interfacial state density, which are essential for the effective field effect and chemical passivation of the n+ emitter. In addition; the Al2O3/TiO2 dual-layer passivation stack suppresses the total reflectance over a broad range of wavelengths (4001000 nm). therefore, with the Al2O3/TiO2 dual-layer passivation stack, the short-circuit current density and efficiency of the NBSi solar cell were increased by 11% and 20%, respectively. In conclusion, a high efficiency Of 18.5% was achieved with the NBSi solar cells by using the n(+) -emitter/p-base structure passivated with the Al2O3/TiO2 stack.
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