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Djimba Niane ¹, Alain Kassine Ehemba ¹, Demba Diallo ¹, Ibrahima Wade ¹, Moustapha Dieng ¹

Affiliations
1 Laboratory of Semiconductors and Solar Energy, Physics Department, University Cheikh Anta Diop, Dakar, SN

Abstract

We used the simulation program Solar Cell Capacitance Sumilator in 1 Dimension (SCAPS-1D) to study the influence of temperature on the electrical parameters of a solar cell based of heterojunction CIGS/CdS/ZnO under constant illumination (1000W/m²) under the conditions AM1.5G. The parameters studied are the short circuit current density(JSC), the open circuit voltage (Voc), the form factor (FF), the efficiency of the cell (ƞ) and the external quantum efficiency (QE) in the range of 273K to 333 K. The simulation shows that the JSC increases while the Voc decreases as a function of temperature. The increase in Jsc causes significant external quantum efficiency and the reduction of Voc and the maximum power affects the FF thus decreasing the efficiency of the solar cell.

Keywords

Solar Cell, CIGS, SCAPS-1D, Temperature, Macroscopic Electrical Parameters.

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Ousmane Diagne ¹, Alain Kassine Ehemba ¹, Demba Diallo ¹, Ibrahima Wade ¹, Mouhamadou Mamour Soce ¹, Moustapha Dieng ¹

Affiliations
1 Laboratory of Semiconductors and Solar Energy, Physics Department, University Cheikh Anta Diop, Dakar, SN

Abstract

In this paper we study the influence of [Ga]/[In + Ga] atomic ratio on electric parameters of the CIGS solar cell. We conduct the simulation of a solar cell constituted of window layer (ZnO)/ buffer layer (CdS)/ absorber Cu(In,Ga)Se₂ using the SCAPS-1D program. We vary the [Ga]/[In + Ga] atomic ratio according to the values 0.3; 0.5 and 0.7. This variation intended to study the behavior of macroscopic electrical parameters (Voc, Jsc, FF, η), characteristic J/V, conductance G/V, capacitance C/V and external quantum efficiency EQE of the cell. The results obtained show that the performance of CIGS solar cells decrease with increasing in [Ga]/[In+Ga] ratio. A conversion efficiency of about 21.54% is obtained with the cell having a ratio of 0.3. This makes it the most promising approach of our cells studied.

Keywords

CIGS Solar Cells, [Ga]/[In+Ga], Electric Parameters, External Quantum Efficiency, SCAPS-1D.

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