A numerical research by researchers at Chitkara College in India has proven improved efficiency of the very best gadget in a tandem photo voltaic cell based mostly on copper indium gallium selenide (CIGS). The design has a better open-circuit voltage, with the highest cell performing as a present limiting cell.
Researchers at Chitkara College in India designed and simulated a two-terminal, monolithically stacked tandem photo voltaic cell based mostly on a backside cell product of perovskite with an power bandgap of 1.68 eV. The highest cell relies on CIGS, with a bandgap of 1.1 eV.
“Our patented design can forestall contact recombination and related reverse saturation present to extend VOC,” stated researcher Rahul Pandey. pv journal.
The researchers performed a numerical simulation to foretell the efficiency and conduct of the gadget, use SCAPS-1D photo voltaic cell capability sFOR probably the most halfwhich is a simulation software for thin-film photo voltaic cells developed on the College of Ghent in Belgium.
They designed the underside cell with an indium zinc oxide (IZO) clear conductive oxide movie, a tin(IV) oxide (SnO2) buffer layer, a perovskite layer, and a layer on methyl-substistudied carbazole (Me-4PACz) as a hole-transport layer. For the highest cell, they prompt utilizing an indium tin oxide (ITO) substrate, a cadmium sulfide (Cds) layer, and a CIGS absorber.
“Within the prime cell, the perovskite layer acts as an absorber to soak up high-energy photons. Equally, the underside cell makes use of the CIGS layer to soak up low-energy photons,” stated the scientists, which signifies that the 2 cells are related by way of an intermediate layer of ITO to offer present matching in tandem configuration.
They examined totally different CIGS absorber layer thicknesses from 0.5 micrometers (μm) to five μm and located that there was a rise in present density attributable to larger photon absorption, in a 2.3 μm thick absorber. layers. In addition they decided that there’s saturation of the present density for thicknesses higher than 2.3 μm.
With an optimized absorber thickness of two.3 μm, the decrease cell exhibits within the simulation it could possibly obtain an influence conversion effectivity of 16.26%, an open-circuit voltage of 0.64 V, a short- circuit present of 35.98 mA/cm2, and a fill. reason behind 70.51%.
“The voltage drop of the tandem photo voltaic cell is the sum of the voltage drop of the identical subcell individually, the scientists stated, including that the highest cell gives much less present than the underside cell of standalone configuration and acts as a present limiting cell.
The tandem gadget prime/beneath cell thickness of 347 nm/2.0 μm exhibits an effectivity of 29.72%, an open-circuit voltage of 1.92 V, a short-circuit present of 20.04 mA/cm2, and a fill issue of 77%.
The scientists launched the cell expertise in “Perovskite-CIGS Monolithic Tandem Photo voltaic Cells with 29.7% Effectivity: A Numerical Research,” which was just lately revealed in Vitality Fuels.
“The primary limitation of the adopted filtered spectrum methodology is that it ignores interface reflection losses and interference results,” they concluded. “The switch matrix methodology (TMM) can be utilized sooner or later to calculate a extra correct filtered spectrum.”
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