SOLA3507/SOLA9002 Solar Cells
College of Photo voltaic and Renewable Energy Engineering
Address 13 – Review Doctor Alison Lennon (Rm 127 TETB)
Assignment and Quiz Represents
• • Marks pertaining to on-time assignments (Assignment a couple of and PG Assignment) needs to be available on BB by following Mon 9 am. Last quiz signifies will be available upon BB by simply Fri 16 June (hopefully sooner). Please check your indicate and visit me if you think it is incorrect. PLEASE TAKE MARKED COPIES OF YOUR QUIZZES WITH YOU. It really is your responsibility to pick up the quizzes. Late assignments and Challenge Trouble solution will probably be marked next week and Job 2 represents adjusted appropriately. I will certainly not be available for the assessment for the next a couple weeks: Tues 10 and 18 June. Nevertheless I will be offered next Fri 14 June from 2-5 pm. CATEI responses. You should help us by completing the survey.
• • •
Aspires of the Course
• The broad aim of this course was going to provide learners with the knowledge that is required to understand the design, operation and characterisation of solar panels. More specifically the course aimed to: • Develop within students a fundamental theoretical understanding of the operation of solar cells; • Expose pupils to a broad variety of solar cell technologies, that are practised in laboratory and commercial conditions; and • Develop within students an ability to employ available equipment and ways to characterise solar panels.
Great Solar Cells
Becquerel Cells: Chemical substance and physical effects Grondahl's rectifier: Relates to metal-SC user interface
1st Modern Dans le cas ou Solar Cellular
• • Fuller produced high-temperature fumes diffusion for large-area junctions. D. M. Chapin, C. S. Fuller, and G. L. Pearson, " A brand new silicon p-n junction photocell for converting solar light into power power”, M. Appl. Phys, 25, 676-677, 1954. Planned p-n verse. 6% transformation efficiency in 1954 and 14% simply by 1958. Determine from Green (1990)
Then what happened?
Silicon Sun Cell Advances (1960s-1970s)
Front side grid, AR coating (1960s)
Back surface field level (1970s)
Textured front (1970s)
Music group Theory of Semiconductors
Precious metals: Conduction and valence rings overlap → easy for bad particals to move between bands. Semiconductor Metal Electron Energy Insulator Conduction music group electrons can move freely in the essudato
Conduction Group Valence Strap
Valence group electrons will be ‘bound' to individual atoms
Denseness of Declares
The Thickness of States is the range of " allowed energy states” per cm3 per strength interval. 5. 3/ two * 3/ 2 almost 8 2π (me ) almost eight 2π (mh ) 1/ 2 1/ 2 N c (E ) sama dengan h3
( E − Ec )
N v (E ) =
( Electronic vehicles − Electronic )
farrenheit (E) =
1 E − EF 1 + exp kT
Music group diagram (T = 0 K)
Density of declares
m*e and m*h – effective mass of electrons and openings
Probability of occupation of states
n(E) and p(E) for Capital t > zero.
The entire free electron density in is the crucial over all feasible energies: ∞ n=
∫ f (E )⋅ N c (E )⋅ para
n = N c exp((EF − Ec ) kT )
* 2πme kT Nc = 2 h2 3/ 2
≈ 6. 2 ×1015 × T a few / two cm −3
" Successful density of states in the CB” Likewise for slots in the valence band:
s = N v exp((Ev − EF ) kT )
2. 2πmh kT N v = 2 h2 3/ 2
≈ several. 5 ×1015 × T 3 as well as 2 cm −3
" Effective thickness of says in the VB”
Rules of Mass Action
Inbuilt, n-type doped and p-type doped si have vastly different electric powered p ≈ NA real estate. n ≈ ND in = l ≡ ni
" n-type silicon”
" p-type silicon”
However , each of them obey legislation of Mass Action, which will states the product of free electrons and free gaps is frequent (in thermal equilibrium).
np = D c In v exp((EF − Ec ) kT ) exp((Ev − EF ) kT ) sama dengan N c N versus exp(− (Ec − Ev ) kT ) np = And c And v exp((− E g )...