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European Journal of Applied Sciences – Vol. 9, No. 6
Publication Date: December 25, 2021
DOI:10.14738/aivp.96.11400. Sory, M. O., Sam, R., & Diasso, A. (2021). Theoretical and Experimental Studies of Electrical Parameters: Irradiance G and
Temperature T Effects. European Journal of Applied Sciences, 9(6). 552-563.
Services for Science and Education – United Kingdom
Theoretical and Experimental Studies of Electrical Parameters:
Irradiance G and Temperature T Effects
SORY Mamadou Osias
Units of Sciences and Technology, Department of Physic
Nazi Boni University, Bobo Dioulasso, Burkina Faso
Units of Sciences and Technology, Department of Physic
Laboratory of Materials, Heliophysic and Environment
Nazi Boni University, Bobo Dioulasso, Burkina Faso
SAM Raguilignaba
Units of Sciences and Technology, Department of Physic
Nazi Boni University, Bobo Dioulasso, Burkina Faso
Units of Sciences and Technology, Department of Physic
Laboratory of Materials, Heliophysic and Environment
Nazi Boni University, Bobo Dioulasso, Burkina Faso
DIASSO Alain
Units of Sciences and Technology
Department of physic, Laboratory of Materials and Environment
Joseph Ki-Zerbo University, Ouagadougou, Burkina Faso
ABSTRACT
The present work explores the effects of temperature T and irradiance G on
electrical parameters as serie resisrance, fill factor and conversion efficiency within
the base region of p-n junction of a polycristaline solar cell. This work is conducted
in two forms as a theoretical study and an experimental study. Indeed, the solar cell
is submitted firstly to various temperature and secondly to various irradiance
values. From a theoretical approach based on the single exponential model theory,
the I-V equation expression is estabilished. This expression taking account
implicitly G and T . This equation I-V permits to developp Matlab script to calculate
I-V and P-V values versus T $and G . The series resistance, fill factor and conversion
efficiency values versus T and G are then deducted and analyzed. From a simple
experimental setup permitting I-V values measurements, the experimental values
of serie resistance, fill factor and conversion efficiency are calculated and also
analyzed. First, these theoretical and experimental results are in good agreement
and secondo are in good agreement with those of the literature.
Keywords: Conversion efficiency, Fill facor, Irradiance, Serie resistance, Temperature.
INTRODUCTION
Nowdays, climate change explain temperature peak and solar irradiance variation sometimes
observed. In these conditions, solar cell quality is affected. This quality is depended precisely of
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Sory, M. O., Sam, R., & Diasso, A. (2021). Theoretical and Experimental Studies of Electrical Parameters: Irradiance G and Temperature T Effects.
European Journal of Applied Sciences, 9(6). 552-563.
URL: http://dx.doi.org/10.14738/aivp.96.11400
electrical parameters as series resistance, fill factor and conversion efficiency ... Then, solar cell
optimization operating is controlled by these parameters.
In this study, we are interested to determinate temperature T and irradiance G effects on series
resistance, fill factor and conversion efficiency from theoretical approach and experimental
approach.
Firstly, the theoretical study mainly using a single exponential model theory permit I-V
equation expression establishment. From this expression, Matlab script is built to calculate I-V
and P-V values. Series resistance, fill factor and conversion efficiency values are then deducted.
Secondly, from a simple experimental set-up; after registration and conversion of I-V curves to
numerical data, the values of series resistance, fill factor and conversion efficiency are
calculated versus T and G.
Thirdly, the effects of T and G on series resistance, fill factor and conversion efficiency reported
and analyzed from theoretical and experimental results obtained.
MATERIALS
The list of experimental set-up materials is as follows:
─ a mono-facial silicon solar cell named GES- 13001
─ a halogen lamp to simulate the sun light near AM1.5
─ a numerical multimeters DMM1 and DMM2
─ a GES-18002 solarimeter
─ a GES- 18003 aquisition set-up
─ a MWD-1501000E transformator
─ an etuve
─ a computer
The experimental set-up is presented on figure 1
Figure 1 : Experimental set-up
Matlab 2013a and Microsoft Excell 2016 software are use respectively to calculate data and to
plot curves. Matlab 2013a is MATLAB and Simulink product. New in this release is the
introduction of Fixed-Point Designer, which combines the functionality of Fixed-Point Toolbox
and Simulink Fixed Point. Excel 2016 is a version of Excel developed by Microsoft that runs on
the Windows platform.
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European Journal of Applied Sciences (EJAS) Vol. 9, Issue 6, December-2021
Services for Science and Education – United Kingdom
THEORETICAL APPROACH
We consider a mono facial polycrystalline solar cell operating under a various values of T and
G and illuminated under AM1.5 spectrum ligth.
The equivalent circuit of one exponential model illustrated on figure 2.
Figure 2 : A solar equivalent model circuit
When solar cell is illiminated, the expression of current I is giving by eqaution 1[1, 2]
(1)
I is solar cell current
Iph is proportionnal to irradiance G. Its expression is follow as:
(2)
Where :
(3)
─ is short circuit current at temperature T
─ is short circuit courant when irradiance and
─ a is temperature change coefficient in indicated on technical sheet.
is standard irradiance value for solar cell performance quantification [3]
is polarisation current giving by equation 4.
(4)
( )
1
s qV RI
nkT s
ph s
sh
V RI I I Ie
R
+ æ ö + = - -- ç ÷
è ø
cc
0
. ph
G I I
G
æ ö = ç ÷ è ø
I I aT T cc , cc ref ref 1 ( ) = + é ù - ë û
cc I
cc ref , I 2
0 G Wm 1000 . - =
25 Celsius degrees T T = = ref
C
!
!
!
G 0
D I
( )
1
s qV RI
nkT
D s I Ie
+ æ ö = ç ÷ -
è ø