TU Delft researchers have investigated for the first time that the effect of rear radiation has on the optimum band gap energy and thickness of the perovskiet cell in a bifacial two-termal perovskiet-silicon dental module. Their findings show that bifacial tandems have more than a profit of 25% in the energy yield compared to bifacial some input modules and up to 5% profit compared to monofacial dental modules.
A research group led by Delft University of Technology (TU Delft) In the Netherlands, investigated how perovskiet materials can be optimized to achieve improved performance in Bifacial two-termal perovskiet-silicon tandem solar cell technologies.
“The most important implication of our research is the effect that has rear radiation on the optimum band gap energy and thickness of the perovskiet cell in a bifacial two-termal perovskiet-silicon dental module,” said the corresponding author of the research, Youri Blom said PV -Magazine. “This is the first time that this type of analysis has been performed at the module level and at this level of detail. We have shown that this rear radiation lowers the optimal perovskietband gap energy by 0.02 EV. In general, the bifacial tandems have compared a yield of 25% larger energy with bifacial few junctions and a 5% larger energy yield compared to monofacial tandems.
The research work is mainly focused on the modeling aspects of photovoltaic multijunction devices to gain a better insight into their work principle under Real-World conditions and gain insight into their optimum design. “Our experimental validated modeling work also refines the existing design guidelines for Perovskiet-silicon tandems, which I expect to be of great value for colleagues working on the design and manufacture of this next generation of PV modules,” Blom added.
The research group used a reference 32.5%-efficient perovskiet-silicon tandem cell developed by the German research center Helmholtz-Zentrum Berlin (HZB) to optimize the design of a perovskiet cell in a bifacial monolithic 2T teeth module under different circumstances. ‘The reference cell is adjusted by reducing the waffle thickness and adding glass and encapsulation, “the group said. “The bifacial modules are made by removing the silver layer and adding a second Inkaps layer.”
The simulations were carried out via the PVMD toolbox, an extensive modeling software to simulate building-integrated and tandem PV systems. The advanced semiconductor analysis (ASA) was used to calculate the electrical properties of the cells and the calibrated amibreed element method (Clem) was used for energy yield simulations.
The simulated modules consisted of 72 perovskiet-silicon tandem cells with a size of 15.7 cm x 15.7 cm. The panels were supposed to be used at 0.5 m above the ground, with the distance between the modules 1 m in the East West and 8 m in the north-south direction.
The Bifacial PV System simulated with the proposed ModuleConfiguration was optimized to work at four different geographical locations, namely Delft (the Netherlands), Shanghai (China), Lagos (Nigeria) and Lisbon (Portugal). The aim was to identify the optimum Perovskiet for the different operating conditions. “For every situation, the optimum perovskiet cell is found by varying the thickness and band gap energy of the perovskiet,” the scientists said. “The simulation steps of the BandGap energy and thickness are 0.01 EV and 50 Nm respectively.”
Through their analysis, the academics discovered that the optimum tire gap energy of the perovskiet material used in the upper device of the tandem cell is in the range of 1.61-1.65 EV lies for all locations, with the optimum thickness 650 -750 Nm is. “The band gap energy is slightly lower for locations with a higher air mass, due to the red shift in the spectrum,” the group explained. “The energy yield varies greatly for different locations, but has a lower dependence on the ground material. This is due to the irradiation at the back is less efficiently converted than the irradiation at the front, due to thermalization and reflection losses. “
They also discovered that the best perovskiet cell configuration can vary, depending on the location, but they have also established that the loss of the energy yield when using a standardized module is smaller than 3% for all scenarios analyzed.
In anticipation, the researchers are planning to extend their analysis to production costs and most cost-competitive tandem designs.
Their findings were presented in the study “Optimization of the perovskiet cell in a bifacial two-termal perovskiet-silicon dental module“Which was recently published in Solar energy materials and solar cells.
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