(Solved) Assignment on Air Mass
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Added on 2021-06-17
(Solved) Assignment on Air Mass
Added on 2021-06-17
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Define the term air mass,The air mass is the measure of how much atmosphere the sunlight will have to pass through towards the surface of the earth.With aid of a simple diagram show how air mass can be measuredThe air mass do represents the section of atmosphere that the light will have to pass through before it strike the Earth relative to its overhead path length, and is equal to Y/X. Hence air mass can be determined by AM = 1cos(θ)AM0 spectrum is the measure of spectrum at the point when there is no air between the sun and the receiver.,AM1 is the measure of spectrum when it travels through the atmosphere to the sea level when the sun is directly overhead AM 1.5 spectrum refers to two standard terrestrial solar spectral irradiance spectra, that include astandard direct normal spectral irradiance and a standard total, withinsteradian field of view of the tilted plane atfrom horizontal
Bi) External Quantum Efficiency (EQE)This is the ratio between the number of photons that are emitted from the LED to the number of electrons that are passing through the device in other words,EQE = [Injection efficiency] x [Internal quantum efficiency] x [Extraction efficiency]ii) spectral response is the ratio of the current generated by the solar cell to thepower incident onthe solar cell.iii) External Quantum Efficiency (EQE) of UV photodiodes.With Photoresponsivity (R), in some papers, it is mentioned as,EQE = 1240 x (R/λ)while in some papers, it is mentioned it as,EQE = 1240 x (R/λ) x 100%.Where 'R' is Photoresponsivity and λin the wavelength of incident lightc) Jsc = q*∅∗EQCPhoton flux = h∗c∗Il∗t = 3∗108∗6.625∗10−34∗50785∗109Jsc= 3∗108∗6.625∗10−34∗50785∗109∗1019∗1.6∗1019∗0.3 = 12.2 mA/cm2
Q2) a)Is a mobile concentration of energy that are in the form of a crystals by an excited electron and an associated hole on the surface of the organic solar cellbi) concentration of photogenerated excitation at depthxii) excitondiffusionlengthiii) excitondiffusioncoefficient( c)
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