Theoretical problem regarding Tandem Cells

Hey folks, first time posting here. My knowledge in tandem (multijunctional) solar cells is limited, so I thought I'd seek online help to answer this problem. I'd appreciate any help I can get here. :)

I tried understanding and doing this on my own by reading places like these http://pveducation.org/pvcdrom/solar-cell-operation/tandem-cells , but I failed miserably :(

Calculate the theoretical maximum efficiency of a tandem solar cell with a) 1-stack, b) 2-stack, c) 3-stack, and d) 5-stack structures with the following assumptions:-

1)Perfect “rectangular” band-pass absorber for each sub-cell;
2)100% quantum efficiency of charge generation by each sub-cell;
3)V_oc for each subcell = 80% of the energy of the least energetic photons absorbed by each subcell;
4)Fill Factor for each cell is 80%;
5)Use AM1.5 global spectrum from 350nm to 1400nm.
6)Perfect interconnects – no optical and electrical loss


Also, can someone please explain to me what "stack" here means? Is one stack a pair of subcells?

Comments

  • Jstraus6Jstraus6 Registered Users Posts: 1
    Does the lack of visible response here mean that no one has been able to help clarify the answer to this question?
  • BB.BB. Super Moderators, Administrators Posts: 29,009 admin
    Most of us here are "end users" of solar/on grid/off grid power systems. A few here design hardware. Nobody here designs solar cells/panels (that I know off).

    Both of you appears to be from University of Rochester (New York). Is this for a solar panel/physics class?

    -Bill
    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
  • mike95490mike95490 Solar Expert Posts: 8,240 ✭✭✭✭✭
    I stopped doing homework in the mid 70's 
     instruction #6 makes the entire lesson worthless, and the instructor should have their tongue wired to a 9v battery.
    Powerfab top of pole PV mount | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
    || Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
    || VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A

    solar: http://tinyurl.com/LMR-Solar
    gen: http://tinyurl.com/LMR-Lister ,

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