How is band energy gap calculated?
By plotting the graph between (ahv)^(1/2) versus photon energy (hv) where, a (alpha) is the absorbance calculated from UV . (hv) can be calculated form wavelength using: (hv = 1240/wavelength);Extrapolating the straight line portion of the curves to zero absorption coefficient value gives the energy band gap value.
What is the probable bandgap of the material used as a solar cell?
Physics of Silicon Solar Cells
An ideal solar cell has a direct band gap of 1.4 eV to absorb the maximum number of photons from the sun’s radiation. Silicon, on the other hand, has an indirect band gap of 1.1 eV.
Why is band gap important?
As the electronegativity difference Δχ increases, so does the energy difference between bonding and antibonding orbitals. The band gap is a very important property of a semiconductor because it determines its color and conductivity.
Why do we not use PbS in solar cell?
materials like PbS (where band gap is 0.4 eV) which have band gaps less than 1.5 eV – are not as frequently used in solar cells as Si, or GaAs, because in solar cells made of PbS, where incident photons’ energy is a lot higher than the band gap, most of the photons incident are absorbed by the top layer of the cell and …
Is a solar panel AC or DC?
Is Solar Power AC or DC? Solar panels produce direct current: the sun shining on the panels stimulates the flow of electrons, creating current. Because these electrons flow in the same direction, the current is direct. An inverter in a home, converting DC to AC.
How do you limit the current of a solar panel?
All you need to do is to use a resistance controlled circuit. You can even do it manually by using a rheostat. Connect it in series to the system. Vary the value of the resistance to achieve different amps.
What is the maximum output of a solar panel?
Solar panels usually range in wattage output from around 250 watts to 400 watts, but some panels exceed the 400 watt mark. The solar panel with the highest watt is the SunPower E-Series, a commercial solar panel line. The top panel in the E-Series comes out at a whopping 435 watts.