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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.
Defects of vision and their correction There is a simple relationship between the focal length F ,the object distance P and the image distance Q of a thin lens fig(1).
What are Magnetic Fields? Like electric and gravitational fields, a magnetic field is a construct which helps you determine the force on a pole due to a magnet generating the f
A particle with a charge of -1.5uC and a mass of 2.5x10-6kgis released from rest at point A and accelerates toward point B, Arriving there with a speed of 42m/s. (a) What is the po
Infra-Red (IR) Detectors: An IR detector has an impedance of Z= (400+j200) ? . During design tests the detector current is measured as 4 µA. What is the output v
Phase advancers: Phase advancers are used to better the power factor of induction motors. The low power factor of an induction motor is because of the fact that its stator winding
Describe the operation of a transistor amplifier in CE configuration. Ans: Operation of a Transistor Amplifier in CE configuration: A Common Emitter NPN transist
Phenomenon of resonance At resonance, rapid transfer of energy takes place resulting louder sound (booming sound). If two bodies having same natural frequency is placed side b
Explain the meaning of Lasers? Lasers use these discrete energy levels in atoms or molecules to build a large population of atoms at an excited energy level that are ready and
importance of vectors as it affects our day to day activities
A block of mass 2 kg is pulled up on a smooth incline making angle 30 degrees with horizontal . if block moves with an acceleration of 1 m/s2 , find a) Power delivered by the pull
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