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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
 |
Fig. 1. Device configuration showing the direction of incident light.
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Introduction
Two of our students, Anuj Tejpal and Priyesh Ranjan have started a company called “TheBrandGuru.info”:
http://www.thebrandguru.info/index.html
The website states:
“We provide our services to coaching institutes/schools/colleges, small & medium-sized companies, web portals, regional movies/serials, media houses & commercial products.
Our services include: Branding and marketing services, Advertizing, Consulting, Website Usability Audit, Social media consulting & marketing, etc.”
Both the partners have prior experience in starting novel venture of www. padhakujoker.com, an e-learning platform.
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About founders
http://www.thebrandguru.info/links/about_us.html
(Priyesh Ranjan)
Priyesh is a final year student at IT-BHU, Varanasi, pursuing a B. Tech degree in Ceramic Engineering.
He has written a novel – That’s The Life Baby- published by Mahaveer Publishers, New Delhi. He is also the Co-founder of PadhakuJoker.com, an e-learning platform, where he heads the marketing, strategy & media wing.
You can contact him at 2priyeshranjan@gmail.com
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(Anuj Tejpal)
Anuj is a fourth year student at IT-BHU, Varanasi, pursuing an Integrated Dual Degree in Ceramic Engineering.
He is the CEO of PadhakuJoker.com, an e-learning platform which caters to the needs of the school students. He has also worked on a techno-management project at UIUC (University of Illinois at Urbana Champaign), USA. He brings with him a vast experience in the field of social media consulting.
You can contact him at anujtejpal@gmail.com
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Interview
Chronicle interviews Anuj Tejpal about his new venture:
Q-1: Anuj, congratulations for starting this unique venture. How and why it was started?
Thank you. While working for Padhaku Joker, we dealt with various institutes and small business groups. We found that there were many small business institutions which could grow bigger and more profitable using proper marketing and consulting services. Then this idea came up in our mind that why not provide these services to small businesses and help them in their growth.
Q-2: How does business model of your venture work? What efforts are needed to attract customers?
Mainly our clients are coaching institutes/schools/colleges, small & medium-sized companies, web portals, regional movies/serials, media houses & commercial products. We are working 24*7 for this venture and trying to get more and more clients. Right now our main focus is UP and Bihar because there are hundreds of small institutions to be explored in this region.
Q-3: What are the current projects under execution? You do not any management qualifications or marketing experience, why should a customer come to you?
Our current projects include L-1, an IIT-JEE/PMT coaching of Varanasi and a fiction book.
No book can teach you marketing or business. You learn it by doing. Besides, we have done our homework properly. We have members with complementary skill-sets. In this field, you learn and grow every day. We keep on adding value to our organization.
Q-4: What are your future plans?
We plan to enter regional cinema market. We are in talks with some people for the same. We have set some financial targets. If things go well, we see ourselves working full-time for TheBrandGuru.info.
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Media news
Young students start TheBrandGuru.info
http://www.merinews.com/article/young-students-start-the-brand-guru/15815086.shtml
It's very encouraging to see young minds coming up with new ideas and pursuing an offbeat path to execute it. Only time will tell whether TheBrandGuru.info makes it to the successful list or not.
Mon, May 24, 2010 11:27:07 IST
STARTING A business is easy but sustaining it is very hard. Out of thousands of start-ups in India, only handfuls make it to the top. Rest are simply lost in the jungle. What are the reasons behind this failure? Why hundreds of initiatives die before flowering?
The answer is very simple- those businesses are unable to make their brand value in the market. They don’t know how to increase their brand visibility and penetration. This was the thought which drove Anuj Tejpal, a senior IDD student at IT-BHU, Varanasi, to start TheBrandGuru.info with his friends.
According to Anuj, the focus of The Brand is on converting local brands into successful ones. Anuj says, “We provide customized services to coaching institutes/schools/colleges, small & medium-sized companies, web portals, regional movies/serials, media houses & commercial products.”
When asked about the lack of a formal management education, Anuj quips, “No book can teach you marketing or business. You learn it by doing. Besides, we have done our homework properly. We have members with complementary skill-sets. People have showed their faith in us and we have got two clients within a month of operation.”
TheBrandGuru.info strives to identify growth opportunities of the brands in existing markets and as well as in new markets. It also promises to give consulting services in brand management, market research & marketing planning & execution.
It’s very encouraging to see young minds coming up with new ideas and pursuing an offbeat path to execute it. Only time will tell whether TheBrandGuru.info makes it to the successful list or not. For now, All is Well for Anuj and his team.
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News item from Pioneer News Service dated 11 June, 2010 showing brand marketing of a coaching class in Varanasi by “The Brand Guru”
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Introduction
Two of our students, Akash Dutt Dubey and Shahnawaz Khan have started a website for Bhojpuri cinema:
Both are research scholars in the Computer Engineering Department of our institute. Both of them did B. Tech. from colleges in Greater NOIDA. They cleared the GATE exam and personal interview and directly joined IT-BHU Computer Engineering Department in 2009 for PhD program. The website is perhaps the first site exclusively for Bhojpuri cinema, a popular cinema among people of eastern UP/western Bihar.
Apart from photos, reviews and details about Bhojpuri cinema, the site has many other features, such as: TV, games, jokes, interviews, online discussion groups, wallpapers, etc.
It also has a section for classical music:
http://classical.bhojpuriyacinema.com/index.php
The website states:
“You can watch and listen to some of the greatest performance of great performer of India, taken from the live performance from different programs in Varanasi. Bageshwari Devi, Dr. Shoma Ghosh, Kumud Jha, Bismillah Khan, Vilayat Khan, Amjad Ali and many more. Find some greater than life performances from the great land, INDIA.”
Akash Dutt Dubey
Akash did his B. Tech from Greater Noida Institute of Technology, Greater NOIDA, UP (http://www.gnit.net/).
Akash can be contacted at: urs.akki@gmail.com
Shahnawaz Khan
Shahnawaz did his B. Tech from Galgotias College of Engineering & Technology. Greater NOIDA, UP (http://www.galgotiacollege.edu/).
Shahnawaz Khan can be contacted at: khan.shaahnawaz@gmail.com
Profile: http://www.google.com/profiles/shaiz.pandit
My blog: http://shamriya.blogspot.com
I tweet: http://twitter.com/punditji
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Interview
Chronicle interviews Akash Dutt Dubey about his new venture:
Q-1: Akash, congratulations for starting this unique website. How and why it was started?
Thanks for the wishes sir. Actually, the idea of www.bhojpuriyacinema.com was just a random thought. In January, we searched for Bhojpuri websites on Google. We got many results but none of them were too impressive. Suddenly, my mind flashed “why shouldn’t we develop a Bhojpuri site?” But this idea of a Bhojpuri site was too big, considering it was so huge to be covered. So, we rather concentrated on the Bhojpuri cinema industry because it also lacked a portal. Slowly, we also covered some literature, jokes and games. Actually, the success of the website encouraged us very much and here we are, with www.classical.bhojpuriyacinema.com, through which we will be trying to promote and encourage the local artists. Within three months, we have as many as 700 unique visitors per day with more than 2000 page views per day.
Q-2: How does the business model of this site work? What efforts are needed to maintain the website?
We never intended to make money from this website. Since beginning, our soul aim has been to provide a proper and international platform for the Bhojpuri Culture, Literature, Movies and the local artists. Of course, money is always an integral part, but till it hurts too much, we will keep trying. Before launching this site, we had to go through a survey for a month or so, and then we had to meet all the PROs of the celebrities, collect the videos and audio songs of the artists listed in classical section. We did everything which we could do for the site. It was our sheer passion and confidence that we continued our work without any financial assistance. We mainly work after the department works are over and I think we give almost 4-5 hours daily for the website. My Dad, Mr. Alok Kumar Dubey, helped us a lot by providing us the contacts of some very important personalities who helped us very much. Being a cinema exhibitor, Dad has been helping us through all the time. Convincing the celebrities wasn’t a tough job mainly because Dad has very good terms with all the celebrities.
Q-3: What are your future plans?
Well, as far as the future plans are considered, we are thinking of starting a social networking site for the Bhojpuri people, we want to provide them a place where they are too comfortable speaking Bhojpuri. Right now, we are working on adding some more features to the website like chatting (which will be introduced by the name of “BATKAHI”). Other than this, we are also in search of the local artists who have lots of talent but haven’t been discovered yet. I strongly believe that the talents we see on the reality shows are just a glimpse, India has lot more talent, it’s just a matter of chance and who knows, we might be able to find some real diamonds. Also, we are thinking of launching the English version of the website along with the mobile version.
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Media news
Website to promote Bhojpuri cinema
http://www.hindustantimes.com/Website-to-promote-Bhojpuri-cinema/Article1-552139.aspx
Akanksha Sarraff/ HTC, Hindustan Times
June 02, 2010
They might be western rock music and Indipop fiends, but their heart lies in the Bhojpuri land.
Budding engineers from IT-BHU have developed a website to promote Bhojpuri Cinema, www.bhojpuriyacinema.com.
The research scholars from Computer Science, IT BHU, Akash Dutt Dubey and Shahnawaz Khan created the first ever website which clubs Bhojpuri Cinema, Art and its Culture on one, making the Bhojpuri land just a mouse click away.
"This website has been created to spread awareness about Bhojpuri language. This is the first ever Bhojpuriya site which will provide world level platform with bhojpuri cinema along with the local artistes of Varanasi," excited Akash Dutt Dubey claimed during the launch of 'www.bhojpuriyacinema.com'.
Latest superstar of Bhojpuri film industry, Dinesh Lal Yadav aka 'Nirahua' launched the website on Monday.
Akash further said, "You can find Bhojpuri Songs, trailors and wall papers of Bhojpuri Films, Bhojpuri Samachar, games in Bhojpuri language, Bhojpuri Greetings, details about people from Bhojpuri speaking area and tons of other Bhojpuri related information."
Speaking on the occasion, Shahnawaz said, "Today Bhojpuri cinema is at par with Hindi cinema and it too is going global. Having a website for the film and its culture will be helpful for those who want to know more about the film. It will help to develop business too."
"We were working on this site from the first week of February and it became online on March 25. You can assume its popularity that within two months the site has got more than one lakh hits which is an achievement for us," added Shahnawaz.
Emboldened by the over one lakh hits, the IT-BHU duo is planning to add the live concert of regional artiste of classical and semi classical music, like Soma Ghosh, Bageshwari Devi and others to the site.
"The journey doesn't stop here. We want to see our local artiste on Internet. People who love to listen chaiti, Kajri and other semi classic renditions can enjoy listening through our website. Apart from this, we want to prepare social networking site in Bhojpuri, which will be a new revolution," shared Akash.
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Kaviji Prayeshlal Yadav, Dinesh Lal Yadav, Dr. R. B. Mishra (Supervisor), Dr. O. P. Upadhyay
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a) Department of Electronics Engineering
(Forwarded by Praharsh Sharma, B. Tech. Part-IV Electronics Engineer. Email: praharshsharmaster@gmail.com )
(2010 graduating class of Electronics Engineering)
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Following is the formulae for calculating various GPAs for undergraduate study at our institute. It is based on grade point obtained for each credit. We have received several queries from students desirous of higher study/employment in India/abroad, to know about GPA conversion formulae. Students may forward the link of this article as official information for conversion.
(This information is provided by Assistant Registrar (Academic) and forwarded to us by Praharsh Sharma, B. Tech. Part-IV Electronics Engineer. Email: praharshsharmaster@gmail.com)
The undergraduate study includes:
-4 yr B. Tech/B. Pharm program
-5 yr IDD (Integrated Dual Degree) program
-5 yr IMD (Integrated M. Tech) program
Following GPAs can be calculated:
-SGPA (Semester Grade Point Average), at the end of each semester,
-YGPA (Yearly Grade Point Average), at the end of each year,
-CGPA (Cumulative grade Point Average), at the end of 3rd yr of B. Tech/B. Pharm program and at the end of 4th yr of IDD/IMD program,
-DGPA (Degree Grade Point Average) at the end of 4th yr of B. Tech/B. Pharm program and at the end of 5th yr of IDD/IMD program.
GPA to % marks conversion
X = 10Y
Where, X = Equivalent Average Percentage of marks
Y = applicable GPA (SGPA/YGPA/CGPA/DGPA as the case may be)
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Institute of Technology, Banaras Hindu University
Varanasi 221005, UP