1. Advanced design rules for Nanophotonic thin film solar cells Sonia Messadi, H. Ding, G. Gomard, X. Meng, R. Peretti, L. Lalouat, E. Drouard, F. Mandorlo, A. Fave and C. Seassal Institut des Nanotechnologies de Lyon Sun light Three main regimes: Improved light trapping

2. Enhanced absorption by channeling at low wavelengths (blue) Effective index medium theories not suitable Channeling in nanoholes: larger absorption in underlying material remaining absorption around holes : need for a good passivation Photovoltaic Technical Conference - Thin Film & Advanced Silicon Solutions 2013. Sonia MESSADI2 Electric field with and without conformal heterojunction Gomard et al, Optics Express, Vol. 21, Issue S3, pp. A515-A527 (2013) c-Si a-Si

3. Modal Engineering at large wavelengths (red)3 Photovoltaic Technical Conference - Thin Film & Advanced Silicon Solutions 2013. Sonia MESSADI Slow Bloch Mode critical coupling : coupling losses = absorption losses  Max peak absorption (50%) Strong coupling of Slow Bloch Modes with incident plane wave: Lower absorption peak value Larger width  Larger integrated absorption Process underway using bounded crystalline silicon thin films In order to generate complex patterns, interferential lithography and dry etching can be used. Cf also “Absorption Enhancement in Disordered Photonic Crystals: A Photonics Point of View" - R. Peretti, Friday, 9:10 am