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A combination of photocurrent and photothermal spectroscopic techniques is applied to experimentally quantify the useful and parasitic absorption of light in thin hydrogenated microcrystalline silicon (μc-Si: H) films incorporating optimized metal nanoparticle arrays, located at the rear surface, for improved light trapping via resonant plasmonic scattering. The photothermal technique accounts for the total absorptance and the photocurrent signal accounts only for the photons absorbed in the μc-Si: H layer (useful absorptance); therefore, the method allows for independent quantification of the useful and parasitic absorptance of the plasmonic (or any other) light trapping structure. We demonstrate that with a 0.9 μm thick absorber layer the optical losses related to the plasmonic light trapping in the whole structure are insignificant below 730 nm, above which they increase rapidly with increasing illumination wavelength …
Nature Publishing Group
Publication date: 
3 Mar 2016

Seweryn Morawiec, Jakub Holovský, Manuel J Mendes, Martin Müller, Kristina Ganzerová, Aliaksei Vetushka, Martin Ledinský, Francesco Priolo, Antonin Fejfar, Isodiana Crupi

Biblio References: 
Volume: 6 Pages: 22481
Scientific reports