Luminescent coupling in planar opto-electronic devices

dc.contributor.authorWilkins, Matthew
dc.contributor.authorValdivia, Christopher E.
dc.contributor.authorGabr, Ahmed M.
dc.contributor.authorMasson, Denis
dc.contributor.authorFafard, Simon
dc.contributor.authorHinzer, Karin
dc.identifier.citationJOURNAL OF APPLIED PHYSICS 118, 143102 (2015)
dc.description.abstractEffects of luminescent coupling are observed in monolithic 5V, five-junction GaAs phototransducers. Power conversion efficiency was measured at 61.6%+/-3% under the continuous, monochromatic illumination for which they were designed. Modeling shows that photon recycling can account for up to 350mV of photovoltage in these devices. Drift-diffusion based simulations including a luminescent coupling term in the continuity equation show a broadening of the internal quantum efficiency curve which agrees well with experimental measurements. Luminescent coupling is shown to expand the spectral bandwidth of the phototransducer by a factor of at least 3.5 for devices with three or more junctions, even in cases where multiple absorption/emission events are required to transfer excess carriers into the limiting junction. We present a detailed description of the novel luminescent coupling modeling technique used to predict these performance enhancements.
dc.description.sponsorshipThe authors would like to thank CMC Microsystems, Inc. for providing facilities used in this project. The authors also thank the Natural Sciences and Engineering Research Council (NSERC), Ontario Centers of Excellence (OCE), and the Canada Research Chairs program for funding support. D.M. and S.F. are co-founders of Azastra Opto, Inc., which is the provider of the phototransducer device samples tested in this work.
dc.titleLuminescent coupling in planar opto-electronic devices
CollectionScience informatique et génie électrique // Electrical Engineering and Computer Science