On March 18, 2021, NTPC Ltd.’s unit in Bongaigaon, Assam, achieved the highest Plant Load Factor (PLF) of 101.39% since all of its units were commissioned. ▪ NTPC generated 254.6 BU during April-December 2022, an increase of 16.1% over the previous year. ▪ The coal plants registered a PLF of 73.7% for the first nine-months period in FY23 compared to 68.5% in FY22 for the same period

1. UCSD Physics 12
Submitted by :- Gaurav (2k20/EE/102)
Submitted to:- Prof. Md. Gulam Mustafa

2. UCSD Physics 12
• Highly purified silicon (Si) from sand, quartz, etc. is “doped” with intentional
impurities at controlled concentrations to produce a p-n junction
– p-n junctions are common and useful: diodes, CCDs, photodiodes, transistors
• A photon incident on the p-n junction liberates an electron
– photon disappears, any excess energy goes into kinetic energy of electron (heat)
– electron wanders around drunkenly, and might stumble into “depletion region”
where electric field exists (electrons, being negative, move against field arrows)
– electric field sweeps electron across the junction, constituting a current
– more photons  more electrons  more current  more power
n-type silicon
p-type silicon
photon of light
liberated electron
electric field
Si doped with
boron, e.g.
Si doped with
phosphorous, e.g.
Photovoltaic (PV) Scheme

3. UCSD Physics 12
Spring 2013 3
PV types
• Single-crystal silicon
– 15–18% efficient, typically
– expensive to make (grown as big crystal)
• Poly-crystalline silicon
– 12–16% efficient, slowly improving
– cheaper to make (cast in ingots)
• Amorphous silicon (non-crystalline)
– 4–8% efficient
– cheapest per Watt
– called “thin film”, easily deposited on a wide range of
surface types

4. UCSD Physics 12
simulation

5. UCSD Physics 12
Spring 2013 5
Results
DC voltage, we get from solar panel

6. UCSD Physics 12
Pulsating AC supply

7. UCSD Physics 12
Pure AC

8. UCSD Physics 12