Editing GaAs detector (section)

= Detector #7, 3953C3 =
Measured capacitance with LCR Meter BK Precision 879, 39pF. 

Data acquired on 8/14/2014 using bench supplies:

Image of the device #7 and #8.

[[file:gaas-7_8.jpg|thumb|border|thin intrinsic layer detector]]

These two detectors have intrinsic layers that are 10um thick.  The n-side is 150um thick and the p-side is 1um thick?  The &quot;active area&quot; is the center anode contact and there is a guard ring as can be seen in the picture.  At this point I have utilized the guard ring.

Observed odd behavior.  When measuring the reverse bias I noticed that when I gradually ramp the voltage up to 70V (for example) the measured current draw stays low, as described in the table.  However, if I apply the voltage instantly at 70V and look at the current draw it starts high and goes down &quot;slowly&quot; over time to approximately the steady state values below.  There appears to be non-trivial capacitance incorporated in to the device.

{| align=&quot;center boarder = &quot;1&quot;
! Reverse bias (dark, covered)
|-
! Voltage (applied, V)
! Current (measured, uA) (10k ohm resistor in series)
|-
| 10 || 0.0
|-
| 20 || 0.1
|-
| 30 || 0.1
|-
| 40 || 0.1
|-
| 50 || 0.1
|-
| 60 || 0.11
|-
| 70 || 0.15
|-
| 72 || 0.13
|-
| 74 || 0.15
|-
| 76 || 0.17
|-
| 80 || 0.2
|-
| 85 || 0.2
|-
| 90 || 0.1
|-
| 95 || 0.1
|-
| 100 || 0.1
|-
| 105 || 0.1
|-
| 110 || 142
|-
| 115 || 188.9
|-
! Forward bias (dark, covered)
|-
! Voltage (applied, V)
! Current (measured, uA) (10k ohm resistor in series)
|-
| 0 || 0.06
|-
| 0.1 || 0.06
|-
| 0.2 || 0.08
|-
| 0.4 || 0.08
|-
| 0.5 || 0.09
|-
| 0.6 || 0.23
|-
| 0.7 || 1.38
|-
| 0.8 || 2.77
|-
| 0.9 || 9.17
|-
| 1.0 || 17.6
|-
| 1.1 || 27.2
|-
| 1.2 || 32.3
|-
| 1.3 || 42.6
|-
| 1.4 || 49.7
|-
| 1.5 || 60.6
|-
| 1.6 || 71.0
|-
| 1.7 || 80.3
|-
| 1.83 || 91.4
|-
| 1.95 || 102
|-
| 2.11 || 118
|-
| 2.24 || 130
|-
| 2.37 || 143
|}