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F10.03 - All-Silicon Spherical-Mie-Resonator Photodiode with Spectral Response in the Infrared Region 
April 25, 2014   9:00am - 9:15am

M. Garín1,2,3, R. Fenollosa1,2, L. Shi, R. Alcubilla3, L.F. Marsal4 & F. Meseguer1,21 Unidad Asociada ICMM/CSIC-UPV, Universidad Politécnica de Valencia, 46022, Valencia, Spain.2 Instituto de Ciencia de Materiales de Madrid CSIC, Madrid, 28049, Spain.3 Dept. d’Enginyeria Electrònica, Universitat Politècnica de Catalunya. 08034 Barcelona, Spain.4 Dept. d’Enginyeria Electrònica, Electrica I Automatica. Universitat Rovira i Virgili. 43007 Tarragona, Spain. Single-junction photovoltaic devices suffer from intrinsic obstacles limiting their efficiency to a top value dictated by the well-known Shockley-Queisser (SQ) limit [1]. The development of photodiode devices on micro and nanophotonic structures has opened new possibilities over the standard technology. The impinging light is strongly confined inside those photonic struc-tures, enhancing optical absorption and photocarrier generation, as it has been reported for planar optical cavities and, more recently, for nanowire resonators [2,3]. The most fundamen-tal limitation is given by the energy bandgap of the semiconductor, which determines the minimum energy of photons that can be converted into electron-hole pairs. In the case of sili-con a large percentage of infrared sunlight, with energy value below the fundamental absorp-tion edge of silicon, is still useless. Here we show the first example of a photodiode developed on a micrometer size silicon spherical cavity whose photocurrent shows the Mie modes of a classical spherical resonator. The long dwell time of resonating photons enhances the absorp-tion efficiency of photons. Also the photocurrent response shows very rich spectra with plenty of high-Q resonant peaks in a similar manner as the scattering spectra of high order whisper-ing gallery modes (WGMs) of spherical microcavities. Also, as a consequence of the en-hanced resonant absorption, the photocurrent response extends far below the bandgap of crystalline silicon [4]. It opens the door for developing a new generation of solar cells and pho-todetectors that may harvest infrared light more efficiently than silicon based photovoltaic de-vices. REFERENCES1. Schockley, W. & Queisser, H. J. J. Appl. Phys. 32, 510-519, (1961).2. Wallentin, J. et al. Science 339, 1057, (2013).3. Krogstrup, P. et al. Nature Photon. 7, 306—310, (2013). 4. Garin, M., Fenollosa, Shi L., Alcubilla R., Marsal Ll., and Meseguer F. Submitted for publication.

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Keynote Address
Panel Discussion - Different Approaches to Commercializing Materials Research
Business Challenges to Starting a Materials-Based Company
Fred Kavli Distinguished Lectureship in Nanoscience
Application of In-situ X-ray Absorption, Emission and Powder Diffraction Studies in Nanomaterials Research - From the Design of an In-situ Experiment to Data Analysis