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Following is the research paper on Organic Photodetector published by a team of faculty members from our institute, led by Prof. P. Chakrabarti (Dept. of Electronics Engineering). The article was published in May 2010 issue of Current Applied Physics. The abstract of the article is available on nature.com and limited info can be viewed by having free registration with nature.com. The research paper is the outcome of collaborative research done among the faculty of Department of Electronics Engineering (http://itbhu.ac.in/ece/) and School of Material Sciences and Technology (http://itbhu.ac.in/mst/) at our institute.
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About authors:
 |  |  Dr. Rajiv Prakash |  Prof. P. Chakrabarti |
*Dr. Arun Dev Dhar Dwivedi:
Research Scholar, Department of Electronics Engineering
Email: itbhu.arun@gmail.com
* Dr. Arun Kumar Singh:
Research Scholar, School of material Sciences and Technology
Email: Email: arun.itbhu@rediffmail.com |
*Dr. Rajiv Prakash
Associate Professor and Coordinator, School of material Sciences and Technology
Email: rprakash.mst@itbhu.ac.in
*Prof. P. Chakrabarti
Professor & Coordinator
Centre for Research in Microelectronics (CRME)
Department of Electronics Engineering
Email: pchakrabarti.ece@itbhu.ac.in
About Organic Photodetector (by Prof. P. Chakrabarti)
The main objective of the research is to develop /deliver low-cost and reproducible plastic electronic/optoelectronic devices which are expected to emerge as viable alternatives of conventional electronic/optoelectronic devices. The significance of this research is that these devices can cut-down the overall cost per component. This is because the material (often a byproduct of industries) cost is low as compared to inorganic alloy semiconductors (III-V, II-VI) and also fabrication requires inexpensive techniques. Electronic/optoelectronic devices based on conventional inorganic alloy semiconductors require ultra-sophisticated fabrication techniques. The semiconducting polymer (Polycarbazole) used to form the active region of the device was synthesized at SMST, IT-BHU. The device was subsequently fabricated and characterized at the Centre for Research in Microelectronics, Department of Electronics Engineering, IT-BHU. Organic LED, Organic photodiodes, Organic TFT for flat panel display are becoming increasingly attractive. The present paper is a step in this direction.
In summary, electronic/optoelectronic devices based on organic semiconducting polymers have already started replacing conventional devices based on expensive inorganic semiconductors. The low cost of the former technology is the prime driving force behind the users’ tendency to adopt “use and throw” concept for electronic consumer items. In the areas of solar cells, OLEDs, OPDs this new technology is going to have a huge impact in the near future.
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http://www.nature.com/nindia/2010/100517/full/nindia.2010.62.html
Current Applied Physics
http://www.sciencedirect.com/science/journal/15671739
Volume 10, Issue 3, May 2010, Pages 900-903
A proposed organic Schottky barrier photodetector for application in the visible region
A.D.D. Dwivedia, Arun Kumar Singhb, Rajiv Prakashb and P. Chakrabartia, 
, 
a Centre for Research in Microelectronics, Department of Electronics Engineering, Institute of Technology, Banaras Hindu University, Varanasi 221005, India
b School of Materials Science and Technology, Institute of Technology, Banaras Hindu University, Varanasi 221005, India
Received 19 April 2009;
Revised 2 September 2009;
Accepted 23 October 2009.
Available online 29 October 2009.
Abstract
The fabrication and characterization of an organic photodetector (OPD) in the form of ITO coated glass/polycarbazole (PCz)/Al Schottky contact is reported. The device has been fabricated in our laboratory for the first time using the polymer synthesized by us. The device has been subsequently characterized in respect of electrical and optical properties in order to explore its potential for possible use as a detector in the visible region at 650 nm. It is observed that the detector exhibits a reasonably high value of peak detectivity (
6 × 106 cm Hz1/2 W−1) near zero bias voltage at V = 0.2 V.
Keywords: OPD; Polycarbazole; Schottky barrier photodiode; Organic polymer
Article Outline
1. Introduction
2. Experimental
2.1. Preparation of sample
2.2. Device fabrication and measurement
3. Result and discussion
3.1. UV–Vis spectra and estimation of bandgap
3.2. Junction properties and optical characteristics
3.3. Extraction of electrical and optical parameters
4. Conclusion
References
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Figure
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Fig. 1. Device configuration showing the direction of incident light.
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(if you having troubles, try posting your comment on this page or send an email to chronicle @ itbhuglobal.org)Institute of Technology, Banaras Hindu University
Varanasi 221005, UP
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