Luminescent coupling in planar opto-electronic devices

Title: Luminescent coupling in planar opto-electronic devices
Authors: Wilkins, Matthew
Valdivia, Christopher E.
Gabr, Ahmed M.
Masson, Denis
Fafard, Simon
Hinzer, Karin
Date: 12-Oct-2015
Abstract: Effects 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.
DOI: 10.1063/1.4932660
CollectionScience informatique et génie électrique // Electrical Engineering and Computer Science