Contents
What is the temperature effect on avalanche gain?
The avalanche gain, initiated by pure electron injection, was found to reduce with decreasing temperature. However no significant change in the excess noise was measured as the temperature was varied.
What is sensitivity of APD?
APDs are photodiodes with internal gain produced by the application of a reverse voltage. They have a higher signal-to-noise ratio (SNR) than PIN photodiodes, as well as fast time response, low dark current, and high sensitivity. Spectral response range is typically within 200 – 1150 nm.
What is APD mode?
An avalanche photodiode (APD) is a highly sensitive semiconductor photodiode detector that exploits the photoelectric effect to convert light into electricity. From a functional standpoint, they can be regarded as the semiconductor analog of photomultipliers.
How is APD calculated?
The total spectral noise current for an APD in dark conditions is thus given by: iN = [2q(IDS + IDBM2F)B]½ Where q is the electron charge. In the absence of other noise sources, an APD therefore provides a signal-to-noise ratio (SNR) which is F½ worse than a PIN detector with the same quantum efficiency.
Why does avalanche breakdown increase with temperature?
Concerning the increase of the avalanche breakdown voltage with temperature. Yes as you described, as the temperature increases the thermal vibration increases and the mean free path decreases. Hence, the breakdown voltage increases with the temperature increase.
What is the role of APD in detection process?
The large responsivity of an APD can help to reduce detection noise, since it much reduces the impact of electronic noise in the subsequently used photodiode preamplifier. The excess noise factor increases with increasing amplification factor, as obtained for increasing reverse voltage.
What is effect of temperature on Zener and avalanche break down?
A zener diode has two distinctly different breakdown mechanisms: zener breakdown and avalanche breakdown. The zener breakdown voltage decreases as the temperature increases, creating a negative temperature coefficient (TC). The avalanche breakdown voltage increases with temperature (positive TC) (Pryce, 1990).
Which is better PIN or APD?
The main advantage of the APD is that it has a greater level of sensitivity compared to PIN. The avalanche action increases the gain of the diode many times, providing much higher sensitivity. However, an APD requires a higher operating voltage.
Which is the most critical parameter of APD?
The most critical device parameters of APD include the avalanche breakdown voltage and dark current. In this work, we study the temperature dependence of the breakdown voltage and dark current of the mesa-type APD over a wide temperature range of 20–145°C.
What are the breakdown characteristics of mesa type APD?
It is shown that highly stable breakdown characteristics of mesa-type APD can be attained with the optimization of the multiplication layer design. We have achieved excellent stability of avalanche breakdown voltage with a temperature coefficient of 0.017 V/°C.
How is the temperature dependence of InGaAs determined?
The temperature dependence of dark current is attributed to generation-recombination mechanism. The bandgap energy is estimated to be about 0.71 eV based on the temperature variation of dark current, in good agreement with the value for InGaAs. 1. Introduction