Excitonic transitions in Si ?-doped GaAs studied with wavelength modulated lateral photoconductivity
The New Photothermal Wavelength Modulated Photocurrent (PTWMPC) technique was recently used and demonstrated as a simple method for studying the excitonic transitions under the bandgap in Si ?-doped GaAs. The spectroscopic aspects of PTWMPC have been theoretically and experimentally studied. The PTWMPC phenomena and the nature of registered features are explored in details. The PC spectrum line shape, the full width at half-maximum intensity dependence, the chopping frequency and the excitonic peaks position intensity dependence are discussed. The PTWMPC can be proposed as a simple external resonator optoelectronic technique for laser diode frequency stabilization and the Si ?-doped GaAs cell is useful as a device with sharp reference frequency absorption peaks for metrological purposes.
si ?-doped gaas wavelength modulation lateral photoconductivity photothermal optical frequency stabilization