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NONLINEAR ELECTROABSORPTION IN ASYMMETRIC TRIANGULAR QUANTUM WELI SELF-ELECTRO-OPTIC EFFECT DEVICES

The electroabsorptive behavior of asymmetric triangular quantum wells (ATQW) in the active region of a p-i-n self-electro-optic effect device (SEED) structure is experimentally investigated. Excition transition energies are measured by photoluminescence and photocurrent spectroscopy at room temperature and at low temperatures. Room-temperature excitonic linewidths of 9.2 meV for a 265-A ATQW have been obtained. The electric field modulation of excitonic absorption in ATQWs with compositional grading, both increasing and decreasing in the growth direction is presented. When compared with a similar rectangular quantum-well device, it is observed that ATQWs have intrinsically higher responsivity, comparable room temperature linewidths, and higher device on/off ratios.