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Organic & polymer solar cells are made from thin films (typically 100nm) of organic semiconductor such as polymer and small molecule compounds like poly phenylene vinylene, copper phthalocyanine a blue or green organic pigment and carbon fullerenes. The energy conservation efficiency of data using conductive polymer are low at 4-5% efficiency for the best cells to data. Though, these cells could be helpful in some applications where mechanical flexibility and disposability are significant. The invention of conductive polymer has leaded the development of much cheaper cells which are based on inexpensive plastics. However all organic solar cells made of data suffer from degradation upon exposure to UV light, and hence have lifetimes which are far too short to be viable. The conjugated double bond systems in the polymers, which take the charge, are all the time susceptible to breaking up when radiated with shorter wavelengths. Additionally, most conductive polymer, being highly unsaturated and reactive, are highly sensitive to atmospheric moister and oxidation, making commercial applications difficult.
What is an intrinsic semiconductor? How can this material be changed into (i) P-type (ii) N-type extrinsic semiconductor? Describe with the help of energy band diagrams
Q. (a) A giant refracting telescope at an observatory has an objective lens of focal length 15m. If an eyepiece of focal length 1.0 cm is used, what is the angular magnification o
(1) F or supplying power from on alternating current power grid to equipment which uses a different voltage. (2) Electrical power transmission over long dist
Two resistors, of resistance 3 and 6, are connected in parallel across a battery having a voltage of 12V. Determine (a) The total circuit resistance and (b) The current ?
A bird flies in the east direction with a speed of 5 ms -1 . The wind is blowing towards north at a speed of 3 ms -1 . Determine the relative velocity of the bird with
Copper losses: These losses occur because of ohmic resistance of the transformer windings. If I1 and I2 are primary and secondary currents correspondingly and R1and R2 are the res
If 3 particles of different mass located at different positions: 1- 1kg position : (0,0) 2- 2kg position: (0,5) 3- 3kg position : (-1,0) If a force of 2 N at 45 degrees is applie
The v-t graph of a car is shown in the accompanying figure. What is the displacement of the car from t = 0.00 s to t = 15.0 s?
Illustrated below are 5 of the normal modes of ethylene (HCCH). At its equilibrium geometry this molecule has no dipole moment, but for some of the normal modes the distortion dur
The half-life of an isotope of an element is 5 days. The mass of a 10 gram sample of this isotope remaining after 20 days is: a) 0.312 grams b) 0.625 grams c) 1.25 g
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