OPTI 380B Intermediate Optics Laboratory A photoconductor is operated in a mode in which an applied electric field produces a current that is modulated by additional carriers produced by photon excitation, that is, radiation quanta are absorbed and free (photogenerated) charge carriers are generated in the semiconductor
Photoconductivity - an overview | ScienceDirect Topics Photoconductivity is a technique which measures the conductivity change due to excitation by monochromatic light of carriers from states in the forbidden bandgap to either the valence or conduction band By varying the energy of the light, the energy level spectra in the bandgap can be determined [293]
Photoconductive polymers | SpringerLink Photoconductive polymers are typically very good insulators in the dark, when the carrier (s) of electricity, free electrons and or holes, are virtually absent They become more conductive when exposed to light In order to become a photoconductor, the polymer must satisfy two major requirements: 1
(PDF) photoconductivity - Academia. edu We present the excitation profile of the transient and steady-state photoconductivity of poly (phenylene vinylene) and its soluble derivatives over a wide spectral range up to hm ¼ 6:2 eV An apparent increase in the 'photoconductivity' at hm > 3-4 eV arises from external current generated by electron photoemission (PE)
Photoconductivity: Fundamental Concepts - Wiley Online Library Principles of steady-state and modulated photoconductivity (frequency-resolved photoconductivity) are introduced along with their main features in extracting material characteristics such as the density of states in the bandgap
Photoconductive polymers - Springer Photoconductivity is the increase in electrical conductivity of a material caused by absorption of electromagnetic radiation Photoconductive polymers are typically very good insulators in the dark, when the carrier(s) of electricity, free electrons and or holes, are virtually absent They become more conductive when exposed to light
Microsoft Word - Notes13. doc - UC Santa Barbara Before discussing these devices in detail, we will first address two important effects in all photoconductors: square-law absorption and the Shockley-Ramo effect The photoconductor in both the Auston switch and photomixer occur in bulk form; that is, they are a homogeneous material with two metal contacts
PHOTOCONDUCTIVE POLYMERS - ScienceDirect In this presentation I will attempt to cover some of the more recent and significant findings in the areas of charge carrier photogeneration and transport in some of the better defined organic materials, with particular reference to polymeric systems
Photoconductivity | SpringerLink Extrinsic photoconductivity involves levels in the band gap It is either n - or p - type A deep defect center from which carrier generation occurs is called an activator One can distinguish three types of extrinsic photoconductivities involving such activators:
Phototransistors, Photoconductors, and SNSPD - IEEE Xplore Abstract: This chapter begins with the description of the photosensitive counterpart of some electronic devices like the bipolar phototransistor, the unipolar phototransistor, and the photo‐SCR It introduces the photoconductor, the photosensitive counterpart of a resistance, and shows how, surprisingly, it supplies an internal gain
Photodiodes and Photoconductors Tutorials - Thorlabs Figure 100A Photodiode Model A photodiode can be operated in one of two modes: photoconductive (reverse bias) or photovoltaic (zero-bias) Mode selection depends upon the application's speed requirements and the amount of tolerable dark current (leakage current)
Photoconductivity – Definition, Working and its Applications: When the excess carriers in a semiconductor are due to optical luminescence, the resulting conductivity is called photoconductivity This is an important effect, with useful applications in the analysis of semiconductor materials and in the operation of different types of devices The photoconductive effect is explained as follows:
Photo Conductivity: Know Definition, Working, Types, Advantages . . . Photoconductivity is a phenomenon where a material becomes more electrically conductive when it absorbs light, such as infrared, ultraviolet, visible light, or gamma radiation When light hits a semiconductor material, it increases the number of charge carriers, boosting its electrical conductivity