To install click the Add extension button. That's it.

The source code for the WIKI 2 extension is being checked by specialists of the Mozilla Foundation, Google, and Apple. You could also do it yourself at any point in time.

4,5
Kelly Slayton
Congratulations on this excellent venture… what a great idea!
Alexander Grigorievskiy
I use WIKI 2 every day and almost forgot how the original Wikipedia looks like.
Live Statistics
English Articles
Improved in 24 Hours
Added in 24 Hours
What we do. Every page goes through several hundred of perfecting techniques; in live mode. Quite the same Wikipedia. Just better.
.
Leo
Newton
Brights
Milds

From Wikipedia, the free encyclopedia

Photocurrent is the electric current through a photosensitive device, such as a photodiode, as the result of exposure to radiant power. The photocurrent may occur as a result of the photoelectric, photoemissive, or photovoltaic effect. The photocurrent may be enhanced by internal gain caused by interaction among ions and photons under the influence of applied fields, such as occurs in an avalanche photodiode (APD).

When a suitable radiation is used, the photoelectric current is directly proportional to intensity of radiation and increases with the increase in accelerating potential till the stage is reached when photo-current becomes maximum and does not increase with further increase in accelerating potential. The highest (maximum) value of the photo-current is called saturation current. The value of retarding potential at which photo-current becomes zero is called cut-off voltage or stopping potential for the given frequency of the incident ray.

YouTube Encyclopedic

  • 1/3
    Views:
    17 091
    72 655
    609 929
  • Impact of intensity and f on photoelectric effect graph
  • PHOTOELECTRIC EFFECT PART 02
  • Dual Nature Of Radiation and Matter 02 II PhotoElectric Effect - PART 2 -Stopping Potential JEE/NEET

Transcription

Photovoltaics

The generation of a photocurrent forms the basis of the photovoltaic cell.

Photocurrent spectroscopy

A characterization technique called photocurrent spectroscopy (PCS), also known as photoconductivity spectroscopy, is widely used for studying optoelectronic properties of semiconductors and other light absorbing materials.[1] The setup of the technique involves having a semiconductor contacted with electrodes allowing for application of an electric bias, while at the same time a tunable light source incident with a given specific wavelength (energy) and power, usually pulsed by a mechanical chopper.[2][3]

The quantity measured is the electrical response of the circuit, coupled with the spectrograph obtained by varying the incident light energy by a monochromator. The circuit and optics are coupled by use of a lock-in amplifier. The measurements give information related to the band gap of the semiconductor, allowing for identification of various charge transitions like exciton and trion energies. This is highly relevant for studying semiconductor nanostructures like quantum wells,[4] and other nanomaterials like transition metal dichalcogenide monolayers.[5]

Furthermore, by using a piezo stage to vary the lateral position of the semiconductor with micron precision, one can generate a micrograph false color image of the spectra for different positions. This is called scanning photocurrent microscopy (SPCM).[6]

See also

References

  1. ^ "RSC Definition - Photocurrent spectroscopy". RSC. Retrieved 2020-07-19.
  2. ^ Lu, Wei; Fu, Ying (2018). "Photocurrent Spectroscopy". Spectroscopy of Semiconductors. Springer Series in Optical Sciences. Vol. 215. pp. 185–205. doi:10.1007/978-3-319-94953-6_6. ISBN 978-3-319-94952-9. ISSN 0342-4111.
  3. ^ Lamberti, Carlo; Agostini, Giovanni (2013). "15.3 - Photocurrent spectroscopy". Characterization of Semiconductor Heterostructures and Nanostructures (2 ed.). Italy: Elsevier. p. 652-655. doi:10.1016/B978-0-444-59551-5.00001-7. ISBN 978-0-444-59551-5.
  4. ^ O. D. D. Couto; J. Puebla; E.A. Chekhovich; I. J. Luxmoore; C. J. Elliott; N. Babazadeh; M.S. Skolnick; A.I. Tartakovskii; A. B. Krysa (2011). "Charge control in InP/(Ga,In)P single quantum dots embedded in Schottky diodes". Phys. Rev. B. 84 (12): 7. arXiv:1107.2522. Bibcode:2011PhRvB..84d5306P. doi:10.1103/PhysRevB.84.125301. S2CID 119215237.
  5. ^ Mak, Kin Fai; Lee, Changgu; Hone, James; Shan, Jie; Heinz, Tony F. (2010). "Atomically ThinMoS2: A New Direct-Gap Semiconductor". Physical Review Letters. 105 (13): 136805. arXiv:1004.0546. Bibcode:2010PhRvL.105m6805M. doi:10.1103/PhysRevLett.105.136805. ISSN 0031-9007. PMID 21230799. S2CID 40589037.
  6. ^ Graham, Rion; Yu, Dong (2013). "Scanning photocurrent microscopy in semiconductor nanostructures". Modern Physics Letters B. 27 (25): 1330018. Bibcode:2013MPLB...2730018G. doi:10.1142/S0217984913300184. ISSN 0217-9849.


This page was last edited on 12 September 2022, at 01:21
Basis of this page is in Wikipedia. Text is available under the CC BY-SA 3.0 Unported License. Non-text media are available under their specified licenses. Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc. WIKI 2 is an independent company and has no affiliation with Wikimedia Foundation.