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Date: 17-01-15

Monthly new tech capsule: organic semiconductor material "Pentacene"

The present popularly used semiconductor devices/ICs are rigid and hardly flexible. What if you want to put a flexible RFID circuit on a clothing or some packaging material of a food or such perishable/consummable material. Use of silicon or any such in-organic semiconductor material is expensive.
Electronic material researchers are using organic semiconductor materials for such applications which can be printed to form integrated circuits on surfaces of flexible sheet like material using simple technologies such as inkjet printing.

One of the most popular organic semiconductor material now the industry is using is Pentacene. Pentacene is a aromatic hydrocarbon made out of benzene rings. Pentacene is used to fabricate organic LED-based LCD displays and also for designing solar PV cells. The technical issues faced with organic semiconductor material such as Pentacene is they have very weak electron mobility and the metal semiconductor junctions are inconsistent in performance causing reliability issues. These are causing the challenges for researchers to use Pentacene as full-fledged commercial production of organic semiconductor devices.

Here we provide some of the best sources to learn further on Pentacene:

The basic properties of Pentacene is well explained with good number of pictures at:
http://www.chm.bris.ac.uk/motm/pentacene/pentacene.htm

Researchers at Berkeley lab, US have used some of the advanced microscope to view the nanostructures inside Pentacene which are causing impediments to the flow of charge carriers.
To know further on this development visit the website:
http://newscenter.lbl.gov/2015/01/16/solving-organic-semiconductor-mystery/

If you're looking for Indian resources on the subject from IIT Bombay, There is an interesting paper in PDF format which can be freely downloaded from its website:
With Title "Pentacene organic field effect transistors on flexible substrates with polymer dielectrics" and Abstract " Pentacene organic field effect transistors are fabricated using polymethyl methacrylate (PMMA) as a gate dielectric on flexible polymeric substrates like the indium tin oxide coated polyethylene terephthalate (ITO coated PET), and polyethylene napthalate (PEN) in top contact configuration. The ITO and aluminum (evaporated on PEN) act as the gate materials for the OFETs. The devices on ITO coated PET show electron mobility up to 0.07 cm2/V-s and the on/off ratios in the order of 103." at url:
http://dspace.library.iitb.ac.in/jspui/bitstream/10054/293/3/4239458.pdf
If you're interested to buy Pentacene there is a commercial seller with full details on the material at:
http://www.ossila.com/oled_opv_ofet_catalogue3/PCDTBT_P3HT_PCBM_PEDOT_PSS_for_organic_photovoltaics/M151-TIPS_Pentacene.php?gclid=CPC1jPvDmsMCFVUrjgodCbwAMQ

If you wish to go for Wikipedia, the link is http://en.wikipedia.org/wiki/Pentacene

These "new tech capsule" article are basically introduction to something new/different technology published monthly basis.

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