Researchers in Saudi Arabia have constructed a perovskite-silicon tandem cell with textured silicon wafers to supply optimum mild trapping. The system has an open-circuit voltage of 1,851 mV, a short-circuit present of 18.9 mA/cm2, and a fill issue of 80.1%.
Scientists led by King Abdullah College of Science and Know-how (KAUST) in Saudi Arabia achieved an influence conversion effectivity of 28.1% for a perovskite-silicon tandem photo voltaic cell based mostly on textured silicon wafers. .
“Texturing silicon wafers is a vital course of to scale back reflection loss,” mentioned researcher Michele De Bastiani. pv journal. “The method etches the silicon crystal alongside exact crystallographic instructions, leading to a floor lined with evenly distributed random pyramids.”
Scientists say that the texturing of the floor of silicon wafers with alkaline options a longtime course of within the PV business. It permits the formation of randomly distributed pyramids with the identical measurement to scale back the frontal reflection of the incoming mild, thus bettering the sunshine trapping and growing the present output and cell density.
Within the tandem configuration, the texturing helps to realize the present matching situation, when every sub-cell generates the identical present, at increased values. This in flip leads to higher efficiency.
“The direct deposition of hybrid perovskites on textured wafers by resolution shouldn’t be necessary, you will need to management and tune the feel to keep away from shunts on the tip of the pyramids,” mentioned De Bastiani, who as wafer texturing reduces the ought to widen the perovskite bandgap and the variations are as a result of thickness of the perovskite movie.
Lecturers construct the backside cell of n-type float-zone double polished wafers. The system makes use of a tin(IV) oxide (SnO2) buffer layer, an electron transport layer fabricated from buckminsterfullerene (C60), a amorphous silicon (a-Si:H) layer for transmission wafer surfaces deposited by plasma-enhanced chemical vapor deposition (PECVD), and a solution-deposited perovskite movie.
Beneath customary illumination situations, the cell achieved an effectivity of 28.1%, an open-circuit voltage of 1,851 mV, a short-circuit present of 18.9 mA/cm2, and an element of filling 80.1%. The researchers offered the photo voltaic cell expertise in “Monolithic Perovskite/Silicon Tandems with >28% Effectivity: Function of Silicon-Floor Texture on Perovskite Properties,” which was not too long ago printed in Superior Power Supplies.
“The The configuration of the underside cell must be tailored to accommode perovskite high cell processing, aiming on the high tandem efficiency,” the scientists mentioned, hinting that perovskite-silicon cells might attain increased effectivity sooner or later with some modifications.
Picture: FOLDER
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