Chapter 5
... drifted by Eo to the n-side as shown in Figure (5-8). Consequently only those EHPs photo generated within the minority carrier diffusion length Le to the depletion layer can contribute to the photovoltaic effect. Again the importance of the built-in field Eo is apparent. Once an electron diffuses to ...
... drifted by Eo to the n-side as shown in Figure (5-8). Consequently only those EHPs photo generated within the minority carrier diffusion length Le to the depletion layer can contribute to the photovoltaic effect. Again the importance of the built-in field Eo is apparent. Once an electron diffuses to ...
vi characteristics of scr
... the reverse biased junction J2would breakdown. This is known as avalanche breakdown and ...
... the reverse biased junction J2would breakdown. This is known as avalanche breakdown and ...
Atoms and electrons - Dr Chaamwe
... times the mass of electrons and are positively charged. Each are thought to have lines of forces (electric fields) surrounding them. In theory, negative lines of force will not join other negative lines of force. In fact they tend to repel each other. Similarly positive lines of force act in t ...
... times the mass of electrons and are positively charged. Each are thought to have lines of forces (electric fields) surrounding them. In theory, negative lines of force will not join other negative lines of force. In fact they tend to repel each other. Similarly positive lines of force act in t ...
Semiconductors * Learning Outcomes
... It is much easier to consider a single hole moving than many electrons one-by-one filling and leaving holes. Holes are positively charged because they move towards the negative terminal of the power supply. ...
... It is much easier to consider a single hole moving than many electrons one-by-one filling and leaving holes. Holes are positively charged because they move towards the negative terminal of the power supply. ...
Radiation Detection Instrumentation Fundamentals
... • Detector’s poor energy response may be corrected by adding a compensation sheath – Thin layers of metal are constructed around the GM to attenuate the lower photon energies, where the fluence per unit dose rate is high, to a higher degree than the higher energies. – The modified or compensated res ...
... • Detector’s poor energy response may be corrected by adding a compensation sheath – Thin layers of metal are constructed around the GM to attenuate the lower photon energies, where the fluence per unit dose rate is high, to a higher degree than the higher energies. – The modified or compensated res ...
Photomultiplier
Photomultiplier tubes (photomultipliers or PMTs for short), members of the class of vacuum tubes, and more specifically vacuum phototubes, are extremely sensitive detectors of light in the ultraviolet, visible, and near-infrared ranges of the electromagnetic spectrum. These detectors multiply the current produced by incident light by as much as 100 million times (i.e., 160 dB), in multiple dynode stages, enabling (for example) individual photons to be detected when the incident flux of light is very low. Unlike most vacuum tubes, they are not obsolete.The combination of high gain, low noise, high frequency response or, equivalently, ultra-fast response, and large area of collection has maintained photomultipliers an essential place in nuclear and particle physics, astronomy, medical diagnostics including blood tests, medical imaging, motion picture film scanning (telecine), radar jamming, and high-end image scanners known as drum scanners. Elements of photomultiplier technology, when integrated differently, are the basis of night vision devices.Semiconductor devices, particularly avalanche photodiodes, are alternatives to photomultipliers; however, photomultipliers are uniquely well-suited for applications requiring low-noise, high-sensitivity detection of light that is imperfectly collimated.