Home > Products > Photodiodes > High Speed PDs for 0.8-2.4 µm spectral range

Fast and ultrafast IR photodiodes for the wavelength range of 1.0-2.4 µm have been developed by IBSG Co., Ltd in collaboration with the laboratory of Infrared optoelectronics of Ioffe Institute. These GaSb/GaInAsSb/GaAlAsSb-based photodiodes have a separated photosensitive pad (50 or 100 µm in diameter) and a contact pad which are connected by bridge-like frontal contact. The main advantage of the GaSb/GaInAsSb/GaAlAsSb heterostructure is high crystalline quality of epitaxial layers with low density of dislocations (10⁴ cm^–2). The doping level of the active GaInAsSb layer (up to 10¹⁴-10¹⁵ sm^–3) makes it possible to reach low capacity and high response speed for PDs.

High Speed (fast) photodiode PD24-01-HS demonstrates self capacitance as low as 0.5-1.9 pF at a reverse bias of 3.0 V due to low doping level of the active GaInAsSb layer (up to 10¹⁴-10¹⁵ sm^–3). The response speed of the p–i–n photodiodes was studied under conditions of their excitation by radiation pulses of a semiconductor laser operating at λ=1.3 μm with a pulse full width at half maximum (FWHM) of 25 ps. The response speed has a value of τ_0.1-0.9=130-150 ps. The bandwidth of photodiodes is 2 GHz

High Speed (Ultrafast) photodiode PD24-005-HS has self capacitance as low as 0.5-0.9 pF at a reverse bias of 3.0 V due to low doping level of the active GaInAsSb layer (up to 10¹⁴-10¹⁵ cm^–3), as well as unique design of a chip with a separated photosensitive pad (50 or 100 µm in diameter) and a contact pad which are connected by bridge-like frontal contact. The response speed of the p–i–n photodiodes was studied under conditions of their excitation by radiation pulses of a semiconductor laser operating at λ=1.3 μm with a pulse full width at half maximum (FWHM) of 25 ps. Speed of response has a value of τ_0.1-0.9=50-100 ps. The bandwidth of photodiodes reaches 5 GHz. Photodiodes exhibit low magnitude of reverse dark current (I_D = 200-1500 nА) at reverse bias U=–(0.5-3.0) V, high values of current monochromatic sensitivity S_I=1.10-1.15 A/W and specific detection ability D*(λ_max,1000,1)=0.9∙10¹¹ cm∙Hz^1/2∙W^–1 in the spectral interval of 2.0-2.2 µm.

PDXX-YYY-HS – High Speed PD model in SMA package
PDXX-YY-HS – High Speed PD model in TO-18 or TO-46 package