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Novel cadmium telluride solar cell design with potential efficiency of 31.82%

Scientists in Bangladesh designed a cadmium telluride solar cell with upper/top and back contact materials made of aluminum (Al) and nickel (Ni). The device reportedly showed a quantum efficiency of around 100 % at visible wavelengths.

Scientists from the Islamic University in Bangladesh have designed a cadmium telluride (CdTe) solar cell that can purportedly achieve a high level of photon absorption.

The researchers used the SCAPS-1D solar cell capacitance software, which is a simulation tool for thin-film solar cells that was developed by the University of Ghent in Belgium,  for simulating and modeling the solar cell performance.

The solar cell design comprises a zinc oxide (ZnO) transparent conductive oxide (TCO) window layer, a cadmium sulfide (CdS) buffer layer, a CdTe absorber, an electron reflected-hole transport layer (ER-HTL) based on cuprous oxide (Cu2O), and upper/top and back contact materials made of aluminum (Al) and nickel (Ni).

In the proposed cell configuration, both the AI upper/top contact and the Ni back contact provide a low-resistance electrical connection and the ZnO window layer, which reduces light reflection, serves as a TCO layer, thus increasing cell efficiency. The back metal contacts act as the electrode responsible for collecting and transferring electrons generated to the external circuit by the absorber layer.

“To achieve the best performance, it is recommended to set both the acceptor and donor densities for the absorber and buffer layers at 10 cm3,” the scientists emphasized. “These densities can be achieved with a window and buffer layer thickness of 100 nm and an absorber layer thickness of 2500 nm.”

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Simulated under standard illumination conditions, the PV device achieved a power conversion efficiency of 31.82 %, an open-circuit voltage of 1.4811 V, a short-circuit current of 28.682434 mA/cm2, and a fill factor of 74.91%.

“This level of PV efficiency outperforms other research reports by a significant margin,” the group stated. “Additionally, the proposed structure exhibits a high level of photon absorption, with nearly 100 % quantum efficiency at visible wavelengths.”

The solar cell design was introduced in the study “Effect of various layers on improving the photovoltaic efficiency of Al/ZnO/CdS/CdTe/Cu2O/Ni solar cells,” published in the Journal of Alloys and Metallurgical Systems.

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Source: pv magazine