Scientists in India have suggested designing new tandem solar cells using transition -metelichalcogenide as an absorber material for the soil PV device. Their simulations showed that these tandem cells can achieve efficiency of more than 35%.
Researchers at the Indian Institute of Technology Bhubaneswar have designed a tandem solar cell based on an upper perovskiet device and a soil cell that depends on Transitional metal Dichalcogenide (TMD).
TMDs are two -dimensional materials with remarkable semiconducting properties and high optical absorption coefferfiCients. This makes them suitable for the production of semi-transparent and flexible solar cells with potential applications in space travel, architecture, electric vehicles and portable electronics, where lightweight, a high power-per-weight ratio and flexibility are very desirable.
“The tunability of the band gap, excellent optical properties of both perovskite and TMDs make it necessary to investigate performance parameters of 2T-tandem solar cells consisting of perovskite and TMDs as absorbent layers of the upper and soil sub cells,” the research team mentioned in the study “Two-Terminal tandem solar cells based on perovskiet and transition metal Dichalcogenids“Published in Results in Optica.
The scientists used The Scaps-1d solar cell capacity Software, developed by the University of Ghent, to simulate the new cell configuration. For the soil cell, they presented a TMD known as Molybdeneen Diteluride (MOT2), which has an energy band gap of 1.1 EV. It was assumed that it was constructed with a zinc oxide (ZNO) ETLthe TMD absorber, a Copper (II) Telluride (cute) HTL and another gold (AU) Metalcontact.
The upper perovskiet cell was supposed to have and be a band gap of 1.5 EV Built with a substrate made of fluorine-doted Tinoxide (FTO), an electron transport layer (ETL) made from titanium oxide (TIO2), the perovskietabsorber, a copper oxide (CUO) hole transport layer (HTL) and a gold (au) backcontact.
They have the band gap of MOTE2 To achieve a “favorable” tire alignment with the ZNO ETL and CUIn htl. Moreover, they designed the CUO HTL of the upper perovskiet cell as an electron blocking layer.
By sizing the thickness of all cell layers, they simulated different devices with this configuration under standard lighting conditions.
The simulations showed that the top cell could achieve a power conversion efficiency of 26.2%, an open circuit voltage of 1.27 V, a short-circuit current density of 24.7 mA/cm2 and a filling factor of 83.3%. The soil cell turned out to have the potential to achieve an efficiency of 30.3%, an open circuit voltage of 1.05 V, a short -circuit current density of 33.1 mA/cm2 and a filling factor of 86.5%. For both cells, ideal layer thicknesses were identified at 1,000 Nm.
In general, it is predicted that the tandem device will achieve an efficiency of 35.3%, an open circuit voltage of 2.4 V, a short-circuit current density of 16.3 mA/cm2 and a filling factor of 90.3%
“Such high efficiency indicate that on Perovskiet and TMD-based solar cells are interesting for experimental research and the potential to be used for production on flexible substrates via roll-to-roll-based technologies,” the academicians concluded.
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