Effects of ordering on the optical properties of GaInP2

Dean H. Levi; John F. Geisz; Blaine Johs

doi:10.1117/12.559973

20 October 2004 Effects of ordering on the optical properties of GaInP₂

Dean H. Levi, John F. Geisz, Blaine Johs

Proceedings Volume 5530, Fourth International Conference on Solid State Lighting; (2004) https://doi.org/10.1117/12.559973
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

Abstract

GaInP₂ lattice-matched to GaAs or Ge plays an important role in state-of-the-art III-V multijunction solar cells. The fundamental band gap of constant-composition GaInP₂ can be varied by as much as 100meV in metal-organic chemical vapor deposition (MOCVD) grown material by adjusting growth parameters that affect the degree of Cu-Pt ordering. These changes in the band gap of GaInP₂ due to ordering can be exploited in the design of III-V solar cell devices. In order to accurately model the performance of these devices, accurate values of the optical constants of all layers are required. Previous literature reports of the optical properties of GaInP₂ have primarily focused on highly disordered material or higher energy transitions in ordered material. While it has been noted that ordered GaInP₂ material results in anisotropic optical properties, the bulk optical properties of GaInP₂ as a function of ordering have not been sufficiently recorded in the literature for good optical modeling of III-V solar cell devices. In this paper, we present the dielectric functions for a range of ordered/disordered GaInP₂ measured over the range 0.7-5.0 eV using spectroscopic ellipsometry. Data analysis of generalized ellipsometry data utilizing anisotropic multilayer models allows us to report accurate dielectric functions for both the ordinary and extraordinary optical axes.

Citation Download Citation

Dean H. Levi, John F. Geisz, and Blaine Johs "Effects of ordering on the optical properties of GaInP₂", Proc. SPIE 5530, Fourth International Conference on Solid State Lighting, (20 October 2004); https://doi.org/10.1117/12.559973

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