The Study of Optical and Wetting Behavior of Metal Oxide Nanostructures on Textured Silicon Surfaces | Shiv Nadar University
Enquire Now
Apply Now
Undergraduate AdmissionsPhD Admissions Spring 2023MBA Admissions 2023MBA Information Session

The Study of Optical and Wetting Behavior of Metal Oxide Nanostructures on Textured Silicon Surfaces

The tuning of optical and wetting properties of metal oxides, especially their low dimensional structures has attracted considerable interest not only for fundamental understanding, but also for wide range of applications such as light harvesting, self-cleaning, photocatalysis, gas sensing, etc. These twin properties are especially desirable for Si solar cells with micron-scale textured surfaces as they act as a potential platform for minimizing reflection loss owing to multiple scattering of light. Among various metal oxides, nanostructures of Al-doped ZnO (AZO) and TiO2 with increasing surface-to-volume ratio on textured Si can pave the way to improve optical properties via formation of graded refractive index, but also provide freedom to bio-mimic surfaces in order to explore hydrophobicity due to unique (nano to µm range) dual-scale structures with optimum surface roughness. In this context, low specular reflection was demonstrated here by successful synthesis of chemically textured Si surfaces. Following this, a facile approach to grow Au nanoparticles decorated AZO and TiO2 nanorods on textured Si was investigated. Moreover, the optical and wetting properties of these metal-oxides were further tuned by irradiation with 50 keV Ar+-ions as a function of ion fluence (i.e. ions/cm2), giving an interplay between surface morphology and defects especially oxygen vacancies. Finally, the role of TiO2 buffer layer on structural and optical properties of AZO/TiO2/Si hetrostructures was examined with increasing fluence from 11015 to 51016 ions/cm2.

Department: 
Physics
Year: 
2017
Student Name: 
Chetan Prakash Saini
Faculty Advisor: 

Directions