M.Sc. (Semester III) (CBCS) Examination Oct/Nov-2017
Nano-Technology
ORGANIC SEMICONDUCTORS, POLYMERS MOLECULAR
ELECTRONICS
Day Date: Tuesday, 21-11-2017 Max. Marks: 70
Time: 02.30 PM to 05.00 PM
Instructions: Part-I, question 1 is compulsory.
Attempt any four questions from Part II
Figures to the right indicate full marks.
Answers to the Part I and Part II are to be written in same answer
booklet only.
Part I
Q.1 Rewrite the sentence after choosing correct answer from the given
alternatives:
07
The band gap of inorganic semiconductor
2.5-4 eV 1-4 eV
3-4 eV 4-3 eV
Conjugated system has a region of
c-orbitals d-orbitals
p-orbitals h-orbitals
The most basic OLEDs consisted of organic layer.
Single Double
Triple All of these
Overdriving a LED will its lifetime.
Not change Double
Increase Reduce
Air Mass condition is used for terrestrial study of solar cells.
AM0 AM1
AM1.5 AM2
discovered the photovoltaic effect.
Enrico Fermi Alessandro Volta
Heinrich Rudolf Hertz Edmond Becquerel
Excitons are formed in organic photovoltaic diodes because of
organic materials used in OPVDs.
Low dielectric constant Semiconducting properties
Conjugated structure None of these
Q.1 Definition: 07
Organic semiconductors.
Singlets.
HOMO.
Organic p-n junction.
PCE.
Photovoltaic.
Molecular Rectifier.
Page 2 of 2
SLR-MU-717
Part II
Answer any four of the following.
Q.2 Describe with the help of a neat diagram excitons and polarons in organic
semiconductor.
14
Q.3 Give a brief explanation on electronic on optical processes. 14
Q.4 With a neat diagram explain working principle and advantages of organic light
emitting diode (OLED).
14
Q.5 Explain the steps involved in organic photovoltaic diode operation. 14
Q.6 Write a short note about any two. 14
What are advantages and disadvantages of organic solar cells?
Explain some C60 based electron acceptors.
Characterization of PVDs.
Q.7 Explain in detail about any two. 14
Write short note on techniques to fabricate organic thin film transistors
(OTFTs).
Polymer based FET.
Charge transport characterization.