Improving optical absorption in a-Si thin films with TiO2 Mie scatterers

  • Giorgos Giannakoudakis
  • Marcel Di Vece
Open Access
Regular Article


To increase the optical absorption in very thin a-Si films is relevant for more efficient and inexpensive photovoltaics. In this work we deposited TiO2 particles with a gas aggregation source on top of a-Si thin films and study the effect on optical absorption. When using thin films, anti-reflection and enhanced-reflection occurs depending on the thickness, which was employed in this study. The experiments were compared with finite difference time domain (FDTD) simulations which yielded good agreement. Both increased and decreased optical absorption was measured, depending on the photon energy range. This work demonstrates that by tailoring the various parameters, the TiO2 particles can contribute to increasing the efficiency of an a-Si based solar cell.

Graphical abstract


Clusters and Nanostructures 


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© The Author(s) 2017

This is an open access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Authors and Affiliations

  1. 1.Nanophotonics – Physics of Devices, Debye Institute for Nanomaterials Science, Utrecht UniversityUtrechtThe Netherlands
  2. 2.Laboratory of Solid State Physics and Magnetism, Department of Physics and AstronomyLeuvenBelgium
  3. 3.CIMAINA and Dipartimento di Fisica, Università di MilanoMilanoItaly

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