13 research outputs found
Direct imaging of anisotropic minority-carrier diffusion in ordered GaInP
The article of record as published may be found at http://dx.doi.org/10.1063/1.3068196An all-optical technique has been used to provide the first direct measurement of anisotropic
minority-carrier diffusion in an ordered alloy of GaInP. Direct imaging of the minority-carrier
diffusion distribution resulting from generation at a quasipoint source is obtained using an optical
microscope coupled to a scanning electron microscope. Minority-carrier diffusion lengths ranging
from 3 to 60 !m are measured by this technique in double heterostructures of GaInP, GaAs, and
GaInAs, providing a key parameter of interest to the performance of state-of-the-art triple junction
solar cells. Here we show a direct measurement of anisotropy in minority-carrier mobility in ordered
GaInP, which is evident in the oval-shaped distribution of the recombination luminescence. A factor
of 1.6 increase in minority electron mobility along the #110$ major axis is reported.National Science FoundationNSFGrant DMR-0203397Grant DMR-052633