by Alain Kassine Ehemba, Mouhamadou Mamour Socé, Jean Jude Domingo, Salif Cisse and Moustapha Dieng
Original Research
The use of the back surface field BSF within the thin film cells isn't elaborated in a current state of research. In this article we try to adapt it to the Cu(In,Ga)Se2 thin film solar cells. The theoretical study is based on the resolution in one dimension of the equations which govern the behaviour of a photovoltaic cell. The spectrum used is the AM 1.5. The experimental method takes into account all physical phenomena which happen in the solar cell. The comparison of the macroscopic electric parameters of the two cells with BSF and without BSF enabled us to obtain a conversion efficiency of 21.95% for the cell with BSF whereas it is equal to 20.78% for the cell without BSF. The use of the BSF presents a broad maximum absorption band which extends from 0.4µm to 1µm through the study of the quantum efficiency of the cell. The spectral response of the layer reaches a value of 0.7A.W-1 for an incidental wavelength of approximately 1000nm which corresponds to the gap of the absorber of the solar cell of 1.2eV. The improvement of the thickness of the p+ CIGS up-doped, indicates an optimal thickness of 0.5.µm. We find for this thickness an open circuit voltage of 0.71V, a short-circuit current density of 37.409mA.cm-2 and a conversion efficiency of 21.95%. The optimization of the doping concentration acceptors of the p+ CIGS, shows that the optimal concentration corresponds to 10E18cm-3. We find with this acceptors density an open circuit voltage of 0.69V, a short circuit current density of 37.40mA.cm-2 and a conversion efficiency of 21.74%.
American Journal of Energy Research. 2017, 5(2), 57-62. DOI: 10.12691/ajer-5-2-5
Pub. Date: October 24, 2017
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by Mouhamadou M. Soce, Alain K. Ehemba, Ousmane Diagne, Djimba Niane and Moustapha Dieng
Original Research
In the paper, we study the influence of the tunneling effect recombination inside the interface absorber/ CdS and the effect of surface treatment in the absorber of solar cell CIGS Cu-rich. This study will be done with neutrals defects and charged defects. Whatever the charge of the defect, we noted that the cell efficiency decreases with this recombination and increases with the surface treatment. We have also observed that this surface treatment is more efficient and the recombination by tunnel effect is much more harmful when the defects are charged.
American Journal of Energy Research. 2017, 5(2), 51-56. DOI: 10.12691/ajer-5-2-4
Pub. Date: October 24, 2017
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by Kossi Kety, Apélété Komi Amou, Koffi Sagna, Yendoubé Lare and Kossi Napo
Original Research
We study in this paper, based on comparison already made in the literature concerning photovoltaic generator power models, the most optimal model applied to the operation of the photovoltaic generator of Sévagan (Togo). The comparison with the experimental data is carried out, which allowed us to verify the validity of the model. Finally, the influence of the characteristic parameters on the photovoltaic module ECO LINE LX-260P used to make the photovoltaic generator of the Sévagan dispensary (in Togo) is studied in order to predict the power production of the module according to the meteorological conditions(temperature-Irradiation). The comparison with the experimental data will be carried out in order to verify the validity of the model. To verify the validity of the model throughout the range of weather conditions, the process was done in two steps: on a sunny day and a cloudy day. A good agreement was observed with 95%, 97% and 99% correlation coefficients for cloudy, sunny days and the generator photocurrent simulation respectively. The results demonstrate an acceptable accuracy of the power model under different environmental conditions.
American Journal of Energy Research. 2017, 5(2), 41-50. DOI: 10.12691/ajer-5-2-3
Pub. Date: August 24, 2017
18332 Views3048 Downloads
by Saoussane Gouiaa, Ameni Mehdi, Zied Driss, Bilel Ben Amira and Mohamed Salah Abid
Original Research
In this paper, a computer simulation has been done to study the aerodynamic structure around a X5C-02 main blades propeller. The numerical model is based on the resolution of the Navier-Stokes equations with a standard k-ε model. The local characteristics are determined using the software “Solidworks Flow Simulation”. The software gives us the opportunity to extract the global result of this system which is the force of the thrust. The validation of this result has been done using an experimental protocol designed in the laboratory named brushless motor test bench. In this paper, we have described the experimental set up and we have compared it with the numerical curve using two meshes.
American Journal of Energy Research. 2017, 5(2), 35-40. DOI: 10.12691/ajer-5-2-2
Pub. Date: May 15, 2017
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by Akash Meghwar, Latif Ul-Haq and Nafeesa Irshad
Original Research
Global energy demand has increased drastically due to increased world population, industrialization and high consumption in domestic sector. In Pakistan, the village Malo Bheel, District Tharparkar is among those 38% of the rural areas who do not have access to grid electricity while the remaining is experiencing power outages. Pakistan has huge untapped renewable energy potential in the form of wind and solar resources. Wind and PV hybrid system offer promising and cost effective solution for the off-grid rural communities in Pakistan. The techno-economic study of PV-wind hybrid system has been carried out to suggest the most economical electricity generation system for 57 households with varying load in Malo Bheel village. The primary objective of this study is to estimate the appropriate dimension of off grid hybrid photovoltaic-wind with minimal battery storage. The Cost of Energy (COE) and Net Present Cost (NPC) for hybrid system obtained using HOMER software is $0.13 per kWh and $66,445 respectively which is considerably less than the standalone solar and wind systems. Therefore, it is concluded that the hybrid power system for Malo Bheel, District Tharparkar is more feasible than other systems.
American Journal of Energy Research. 2017, 5(2), 28-34. DOI: 10.12691/ajer-5-2-1
Pub. Date: April 08, 2017
17371 Views2602 Downloads1 Likes