December 2016 Current Affairs

November 2016 Current Affairs
30 NOV
NEWS
29 NOV
NEWS
28 NOV
NEWS
26 NOV
NEWS
25 NOV
NEWS
24 NOV
NEWS

October 2016 Current Affairs
31 OCT
NEWS
27 OCT
NEWS
26 OCT
NEWS
25 OCT
NEWS
24 OCT
NEWS
22 OCT
NEWS

September 2016 Current Affairs
30 SEP
NEWS
29 SEP
NEWS
28 SEP
NEWS
27 SEP
NEWS
26 SEP
NEWS
24 SEP
NEWS

August 2016 Current Affairs
31 AUG
NEWS
30 AUG
NEWS
29 AUG
NEWS
27 AUG
NEWS
26 AUG
NEWS
25 AUG
NEWS

IISc researchers develop self-powered UV photodetector for self-charging energy storage devices

IISc researchers develop self-powered UV photodetector for self-charging energy storage devices
15 October 2016 Current Affairs: The researchers from the Indian Institute of Science (IISc), Bengaluru have developed a cost-effective, high-performance, self-powered UV photodetector. 

The self-powered UV photodetector can use the harvested optical energy for direct self-charging of energy storage devices such as supercapacitor. It can also be used for operating electronic devices in the absence of external power source. 

Photodector : Photodector is a device capable of sensing (detecting) or responding to electromagnetic energy, typically light by using the electrical effect of individual photons.

The researchers have developed the photodetector by integrating semiconducting vanadium doped zinc oxide (VZnO) nanoflakes with a conducting polymer. The zinc oxide (ZnO) is the base material for UV detection which can be doped with vanadium to produce photodetectors that are self-powered. The photodetector has superior performance in terms of faster detection of photo signals in the order of milliseconds even when UV light intensity is low.

When doped with vanadium, the microstructure of ZnO changes from nanorods to closely-packed nanoflakes. It causes increase in the surface area to the volume of the material. It also creates surface defects within the band gap of ZnO, which helps in trapping the UV radiation that falls on the nanoflakes. These nanorods are one-dimensional and cause more light reflection from top surface. When UV light enters into pores it undergoes multiple reflections and finally gets absorbed.

Benefits :  The nanoflake (VZnO) produces five times more photocurrent, compared with ZnO, which generates only 40 nA photocurrent. Once these nanoflakes are hydrogenated, the current generation capacity further increased to 1,000 nA. When these hydrogenated nanoflakes exposed to UV light, they detect photo signal within milliseconds, which is nearly 100 times faster than conventional UV photodetectors. VZnO nanoflakes structure has 98% light harvesting efficiency which is much higher than 84% seen in ZnO.


December 2016 Current affairs

November 2016 Current affairs
30 NOV
NEWS
29 NOV
NEWS
28 NOV
NEWS
26 NOV
NEWS
25 NOV
NEWS
24 NOV
NEWS




October 2016 Current affairs
31 OCT
NEWS
27 OCT
NEWS
26 OCT
NEWS
25 OCT
NEWS
24 OCT
NEWS
22 OCT
NEWS

September 2016 Current affairs
30 SEP
NEWS
29 SEP
NEWS
28 SEP
NEWS
27 SEP
NEWS
26 SEP
NEWS
24 SEP
NEWS

August 2016 Current affairs
31 AUG
NEWS
30 AUG
NEWS
29 AUG
NEWS
27 AUG
NEWS
26 AUG
NEWS
25 AUG
NEWS



FreshersLive - No.1 Job site in India. Fresherslive Current Affairs 2016 section offers informative quiz questions with answers regarding latest current affairs today for all sorts of competitive exams like UPSC, TNPSC , IFS, IAS, IPS, railway exams (RRB) and banking exams like IPBS PO, IPBS clerk, Federal Bank PO, ICICI, SBI, RBI legal officer & Grade officer posts and much more. Register with us to get latest Current Affairs Updates. Also get latest Current Affairs news and quiz Updates for free alerts daily through E-mail

Get Daily Current Affairs to your Email

You can Unsubscribe us at any time.

Get Daily Current Affairs to your Email

You can Unsubscribe us at any time.