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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 are the examples
A force of 25 N is applied vertically at the end of a wrench handle that is 45 cm long to tighten a bolt in the clockwise direction. What torque is required by the bolt to keep the
A plane diffraction grating of width 2.5cm has 1500 rulings. Monochromatic light of wave length 5893A 0 is incident normally on it. Determine the angle at which second order princ
Regard as two charged particles. At a given separation every particle exerts a force of 12 N on the other. What force does every one exert on the other after someone moves the part
How to drive it?
Textile industry: High speed drives are essential with wide range of control, small & medium motors are employed. Commutator motors and synchronous motors are used.
A block of mass 10 kg is attached to the end of a horizontal spring with spring constant k = 1200 Nm-1. The block is assumed to be sitting on a frictionless horizontal surface.
There exist two types of charges in nature:- (i) Positive charge (ii) Negative charge Charges with the same electrical sign repel each other, and charges with oppo
An infinite line of positive charge lies along the y axis, with charge density ? = 1.90 µC/m. A dipole is placed with its midpoint along the x axis at x = 22.00 cm. The dipole cons
Radio Waves: Radio waves are electromagnetic waves with large range of wavelength from a few millimetres to many meters.
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