NDLI: Broadband antireflection property of conformally grown zinc tin oxide thin films on nanorippled- and nanofaceted-Si substrates

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Broadband antireflection property of conformally grown zinc tin oxide thin films on nanorippled- and nanofaceted-Si substrates

Content Provider	Scilit
Author	Saini, Mahesh Singh, Ranveer Srivastava, Sanjeev Kumar Som, Tapobrata
Copyright Year	2018
Description	Journal: Journal of Physics D: Applied Physics In this paper, we show the broadband antireflection (AR) property of radio frequency (RF) sputter-grown zinc tin oxide (ZTO) thin films grown on ion-beam fabricated self-organized nanoscale rippled- (R-Si) and faceted-Si (F-Si) substrates. For the sake of comparison, ZTO film has been deposited simultaneously on pristine-Si (P-Si) substrate as well. X-ray diffraction studies show amorphous nature of the films. Atomic force microscopic studies reveal the conformal growth of ZTO thin films (granular in nature) on both R- and F-Si substrates (up to 60 nm). Surface reflectance measurements show a large reduction in the average broadband (300-800 nm) surface reflectance (at 550 nm) from 43.9% for P-Si substrate to 42% and 32% for R-Si and F-Si substrate, respectively. In addition, we show a further reduction in the surface reflectance following the growth of ZTO overlayers (in the range of 15-60 nm) on P-Si, R-Si, and F-Si substrates. As a matter of fact, there is a continuous reduction in surface reflectance up to a thickness of 60 nm, beyond which the reflectance minimum starts increasing. The large reduction in the surface reflectance of ZTO coated P-, R-, and F-Si substrates are attributed to the graded refractive index of the heterostructures driven by the surface morphology of the substrates and the different average surface heights of the films. This study will be very useful for efficient ZTO-based optoelectronic devices and heterojunction solar cell applications.
Related Links	http://iopscience.iop.org/article/10.1088/1361-6463/aac7cf/pdf
ISSN	00223727
e-ISSN	13616463
DOI	10.1088/1361-6463/aac7cf
Journal	Journal of Physics D: Applied Physics
Issue Number	27
Volume Number	51
Language	English
Publisher	IOP Publishing
Publisher Date	2018-05-25
Access Restriction	Open
Subject Keyword	Journal: Journal of Physics D: Applied Physics Surface Reflectance
Content Type	Text
Resource Type	Article
Subject	Surfaces, Coatings and Films Acoustics and Ultrasonics Condensed Matter Physics Electronic, Optical and Magnetic Materials

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