Solar Cell Problem(semiconductor)

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Discussion Overview

The discussion revolves around a homework problem related to solar cells, specifically focusing on the calculation of the fill factor (FF) and the maximum power (Pmax) in the context of semiconductor physics. Participants are exploring the relationships between various parameters such as open-circuit voltage (Voc), short-circuit current (Isc), and the definitions of the variables involved.

Discussion Character

  • Homework-related
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant calculated Voc as 0.298 V and Isc as 3.04 mA but expressed confusion about determining the fill factor (FF) with the given information.
  • Another participant pointed out that the variables in the equations were not defined, suggesting that defining them might help in solving the problem.
  • There is a repeated emphasis on the need to clarify the definition of Pmax, as it is crucial for calculating the fill factor.
  • Participants are discussing the relationship between the maximum power available to a load and the maximum power generated internally by the photocell, indicating uncertainty about which definition to use.

Areas of Agreement / Disagreement

Participants generally agree that defining the variables and clarifying the concept of Pmax is essential for progressing in the problem. However, there is no consensus on how to approach the calculation of the fill factor or the definition of Pmax itself.

Contextual Notes

Limitations include undefined variables in the equations and the lack of clarity regarding the definition of Pmax, which affects the ability to calculate the fill factor accurately.

DragonChase29

Homework Statement


upload_2017-10-23_20-38-31.png


Homework Equations


  • Voc=kt/q x ln(tpXGlXNd/(ni)2)
  • Isc=A x q x Lp x Gl
  • Lp=√(Dp×tp)
  • FF=Pma/(Isc*Voc)

The Attempt at a Solution


I got Voc=.298 V and Isc=3.04 mA
I]However, I am confused as to how to find the fill factor. I know it is the maximum voltage and current the load can take, but how do I determine this with the information given?
I thought it might have something to do with the diode current equation
  • I=I0(eqV/kT-1)
Any help is much appreciated!
 

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DragonChase29 said:

Homework Statement


upload_2017-10-23_20-38-31-png.png
1) The variables above are given values but they are not defined as to what they are. Please do so.

DragonChase29 said:
FF=Pma/(Isc*Voc)
2) There is an undefined variable in 'FF=...'. When it is defined you may be able to assign it a value.

p.s. As I am not familiar with that form of FF definition, I don't know the answer; but when you "get all your ducks in a row" it may become obvious.
 

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Tom.G said:
1) The variables above are given values but they are not defined as to what they are. Please do so.2) There is an undefined variable in 'FF=...'. When it is defined you may be able to assign it a value.

p.s. As I am not familiar with that form of FF definition, I don't know the answer; but when you "get all your ducks in a row" it may become obvious.
First, thanks for the reply. This is a basic plug in chug problem to find V open circuit and I short circuit. I just sont understand how to find the fill factor with this information brcause you need to find the Pmax. How do i find Pmax is my concern.
 
Since I'm not familiar with that form of FF, you will have to clarify Pmax for me. The answer depends on the Pmax definition. (to answer a question, first define the question.)
Is it:
  • the maximum power available to a load?
  • the maximum power the photocell generates internally?
  • something else?
 

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