Solar cell parameter accuracy improvement, via refinement of the Co-Content function. Part 2: Discussion on the experimental application

Abstract

Abstract In this Part 2 of this series of articles, a discussion of the literature reported obtention of the solar cell parameters (the shunt resistance ( R sh ), the series resistance ( R s ), the ideality factor ( n ), the light current ( I lig ), and the saturation current ( I sat )), via the use of the Co-content function <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi mathvariant="italic">CC</mml:mi> <mml:mrow> <mml:mfenced close=")" open="("> <mml:mrow> <mml:mi>V</mml:mi> <mml:mo>,</mml:mo> <mml:mi>I</mml:mi> </mml:mrow> </mml:mfenced> </mml:mrow> <mml:mo>=</mml:mo> <mml:munderover> <mml:mo>∫</mml:mo> <mml:mrow> <mml:mn>0</mml:mn> </mml:mrow> <mml:mrow> <mml:mi>V</mml:mi> </mml:mrow> </mml:munderover> <mml:mrow> <mml:mrow> <mml:mfenced close=")" open="("> <mml:mrow> <mml:mi>I</mml:mi> <mml:mo>−</mml:mo> <mml:msub> <mml:mrow> <mml:mi>I</mml:mi> </mml:mrow> <mml:mrow> <mml:mi mathvariant="italic">sc</mml:mi> </mml:mrow> </mml:msub> </mml:mrow> </mml:mfenced> </mml:mrow> <mml:mi mathvariant="italic">dV</mml:mi> </mml:mrow> </mml:math> (where <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mrow> <mml:mi>I</mml:mi> </mml:mrow> <mml:mrow> <mml:mi mathvariant="italic">sc</mml:mi> </mml:mrow> </mml:msub> <mml:mo>=</mml:mo> <mml:mi>I</mml:mi> <mml:mo stretchy="false">(</mml:mo> <mml:mi>V</mml:mi> <mml:mo>=</mml:mo> <mml:mn>0</mml:mn> <mml:mo stretchy="false">)</mml:mo> </mml:math> ) is given. The results reported in Part 1, namely, the accuracy depe n dence of the determination of R sh , R s , n , I lig , and I sat , as a function of the number of measured points per voltage ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mrow> <mml:mi>P</mml:mi> </mml:mrow> <mml:mrow> <mml:mi>V</mml:mi> </mml:mrow> </mml:msub> </mml:math> ) and percentage noise ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mrow> <mml:mi>p</mml:mi> </mml:mrow> <mml:mrow> <mml:mi>n</mml:mi> </mml:mrow> </mml:msub> </mml:math> ) is used to analyse the reported solar cell parameters. In one case, the application of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi mathvariant="italic">CC</mml:mi> <mml:mrow> <mml:mfenced close=")" open="("> <mml:mrow> <mml:mi>V</mml:mi> <mml:mo>,</mml:mo> <mml:mi>I</mml:mi> </mml:mrow> </mml:mfenced> </mml:mrow> </mml:math> to solar panels is discussed, revealing that it can also be used in the case of solar panels, and not only for laboratory-made solar cells, in voltage ranges larger than [0 V, 1 V]. In another case, the application of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi mathvariant="italic">CC</mml:mi> <mml:mrow> <mml:mfenced close=")" open="("> <mml:mrow> <mml:mi>V</mml:mi> <mml:mo>,</mml:mo> <mml:mi>I</mml:mi> </mml:mrow> </mml:mfenced> </mml:mrow> </mml:math> to IV curves showing the roll-over effect is discussed. It is found that the roll-over effect has a pernicious effect in the solar parameter extraction, and then the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi mathvariant="italic">CC</mml:mi> <mml:mrow> <mml:mfenced close=")" open="("> <mml:mrow> <mml:mi>V</mml:mi> <mml:mo>,</mml:mo> <mml:mi>I</mml:mi> </mml:mrow> </mml:mfenced> </mml:mrow> </mml:math> should be calculated before the roll-over effect takes place. In a third case, the importance of the correct determination of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mrow> <mml:mi>I</mml:mi>

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