Patent ID: 11881490
Assignee: AELUMA, INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 45:
46. A method of assembling a photodetector module device, the method comprising:
providing a module housing, having an exterior region and an interior region, the exterior region having an emitting aperture and a sensing aperture;
spatially disposing a laser device coupled to the emitting aperture and configured to emit electromagnetic radiation having 850 to 1550 nm wavelength range; and
spatially disposing a photodetector circuit coupled to the sensing aperture, the circuit comprising:
a first terminal;
a second terminal;
a silicon (Si) substrate comprising a surface region, the silicon substrate being a portion of a large silicon substrate having a diameter ranging from 4 inches to 12 inches in size;
a plurality of v-grooves having a feature size of 50 to 500 nm in width, each of the v-grooves exposing a 111 crystalline plane of the Si substrate;
a nucleation layer comprising a gallium arsenide material to coat the surface region of the Si substrate, the nucleation layer having a thickness ranging from 10 nm to 100 nm;
a buffer material comprising a plurality of nanowires formed overlying each of the plurality of v-grooves and extending along a length of each of the v-grooves, a first transitionary region extending from each of the plurality of nanowires, and a second transitionary region characterized by a 100 crystalline planar growth of a gallium arsenide compound semiconductor (CS) material configured using a direct heteroepitaxy such that the CS material is characterized by a first bandgap characteristic, a first thermal characteristic, a first polarity, and a first crystalline characteristic, and the silicon substrate is characterized by a second bandgap characteristic, a second thermal characteristic, a second polarity, and a second crystalline characteristic;
an array of photodetectors, the array being characterized by N and M pixel elements, where N is an integer greater than 7, and M is an integer greater than 0; each of the pixel elements having a characteristic length ranging from 0.3 micrometers to 30 micrometers, each of the photodetectors comprising:
an n-type material comprising an InP material comprising a silicon impurity having a concentration ranging from 3E17 cm-3 to 5E18 cm-3 overlying the buffer material;
an absorption material overlying the n-type material, the absorption material comprising an InGaAs containing material, the absorption material being primarily free from any impurity, wherein the absorption material comprises InAs quantum dot or quantum dash containing material;
a p-type material overlying the absorption material, the p-type material comprising a zinc impurity or a beryllium impurity having a concentration ranging from 3E17 cm-3 to 5E18 cm-3;
a first electrode coupled to the n-type material and coupled to the first terminal;
a second electrode coupled to the p-type material and coupled to the second terminal to define a two terminal device;
an illumination region characterized by an aperture region to allow a plurality of photons to interact with the CS material and be absorbed by a portion of the absorption material to cause a generation of mobile charge carriers that produce an electric current between the first terminal and the second terminal;
a responsivity (Amperes/Watt) greater than 0.1 Amperes/Watt characterizing the circuit between the first terminal and the second terminal according to the following equation:, R
  =
  
   η
   ⁢
   
    q
    
     h
     ⁢
     v, where η is the internal quantum efficiency, q is the electron charge, h is Planck's constant, and v is the photon frequency; and
a photodiode quantum efficiency greater than 10% characterizing the circuit as measured between the first terminal and the second terminal according to the following equation: QE=1240×(Rλ/A) where Rλ is responsivity in A/W and Δ is wavelength in nm.