Apr 18, 2013
Graphene-based antireflection stack suits solar cells and UV detectors
Based on experimental and theoretical studies, researchers at the Indian Institute of Technology Delhi, India, have shown that graphene layers deposited on planar and textured silicon surfaces have excellent antireflection (AR) properties.
The team reported that CVD-deposited graphene on planar and textured silicon has significantly lower reflectance, especially over the UV range in comparison with a Si3N4 layer – textured silicon stack commonly used in today’s solar-cell technology.
FDTD calculations confirm light trapping and lower reflectance values for the graphene-SiO2-silicon structure. Graphene layers with an ideal two-dimensional structure and a highly transparent (98%) nature are ideally suited for AR applications in solar cell and UV detector applications.
The researchers presented their results in the journal Nanotechnology.
About the author
The study was led by Dr Bodh Raj Mehta, Schlumberger Chair Professor at Thin Film Laboratory, Physics Department, Indian Institute of Technology Delhi, New Delhi, India. His research focuses on the application of graphene and graphene composites for solar cell and sensing applications, growth of size-selected metal, metal alloy and composite nanoparticles for hydrogen applications, hybrid interfaces for resistive memory and new solar-cell materials for nanorod and multi-sector solar-cell devices. Rakesh Kumar is a PhD student working on the synthesis of graphene and its application in solar cell and sensor devices. Mehar Bhatnagar carried out the FDTD calculations. Dr Ashok Kumar Sharma is a postdoctoral researcher with research interests in PV characterization and the growth of new materials for PV applications. In this study, Rakesh Kumar prepared and deposited the graphene on the silicon samples and performed all the experiments for morphological and structural characterizations of grapheme; Mehar Bhatnagar performed FDTD simulations and Dr Ashok Kumar Sharma performed optical characterizations. Prof. Bodh Raj Mehta conceived the study. The manuscript was written jointly by all of the authors.