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Double-heterostructure GaAs/GaAlAs light-emitting diodes ͑LEDs͒ have been fabricated with the emitter regions beryllium doped to 2ϫ10 19 and 7ϫ10 19 cm Ϫ3. The 7ϫ10 19 cm Ϫ3 doped emitters have an internal quantum efficiency of 10% and an optical modulation bandwidth of 1.7 GHz. The steady-state optical output power versus the input current shows an(More)
—We report high-speed digital modulation of GaAs–AlGaAs light-emitting diodes. Open eye patterns and bit error rates less than 10 9 were obtained for data rates from 750 Mb/s to 1.7 Gb/s. These results are the first report, to our knowledge, of error-free digital modulation experiments for LEDs at bit rates above 1 Gb/s.
Flexible, large area electronics—macroelectronics—using amorphous silicon, low-temperature polysilicon, or various organic and inorganic nanocrystalline semiconductor materials is beginning to show great promise. While much of the activity in macroelectronics has been display-centric, a number of applications where macro-electronics is needed to enable(More)
The photoexcited carrier lifetimes in ex situ-annealed low temperature growth GaAs are measured with a femtosecond transient absorption experiment. The study encompassed two low temperature growth GaAs films with approximately 0.3% and 0.9% excess arsenic incorporated during growth. The observed lifetimes are found to be a function of the spacing of arsenic(More)
The experimental observations of metallurgical interactions between compound semiconductor substrates and metallic or oxide overlayers have stimulated a new model of Fermi level "pinning" at these interfaces. This model assumes the standard Schottky picture of interface band alignment, but that the interface phases involved are not the pure metal or oxide(More)
We report the controlled deposition of close-packed monolayer arrays of ϳ5-nm-diam Au clusters within patterned regions on GaAs device layers, thus demonstrating guided self-assembly on a substrate which can provide interesting semiconductor device characteristics. Uniform nanometer scale ordering of the clusters is achieved by a chemical self-assembly(More)
—Practical design of high-voltage SiC Schottky recti-fiers requires an understanding of the device physics that affect the key performance parameters. Forward characteristics of SiC Schottky rectifiers follow thermionic emission theory and are relatively well understood. However, the reverse characteristics are not well understood and have not been(More)
Ex situ nonalloyed ohmic contacts were made to n-and p-type GaAs using low-temperature molecular beam epitaxy. For n-type GaAs, Ag, and Ti/Au nonalloyed contacts displayed specific contact resistitivities of mid 10 Ϫ7 ⍀ cm 2. For p-type GaAs, nonalloyed Ti/Au contacts with specific contact resistivities of about 10 Ϫ7 ⍀ cm 2 were obtained. Alloyed ohmic(More)