Researchers in China have improved the interface engineering in Perovskiet-silicon solar cells with the help of industrially structured silicon. The result is a very efficient tandem device that also showed remarkable stability.
A group of scientists at Zhejiang University in China has developed a perovskiet-silicon tandem solar cell that uses structured silicon substrates to improve interface engineering between the upper perovskiet device and the silicon floor cell.
The proposed architecture uses submicron contacts based on Silica (SIOX) Nanospheres to regulate silicon substrates that show iceberg -like pyramids on the top cell of Perovskiet, which are a challenge for commercial production in standard photovoltaic production processes.
“Industrial textured silicon (ITS), with pyramids with a micron, offers a more attractive and cost -effective solution,” the researchers noted. “These substrates can be produced directly in existing silicon cell production processes, so that scalability and compatibility with established industrial practices are guaranteed. Moreover, industrially structured surface is improving light catches, which makes it possible to improve the efficiency of tandem solar cells.”
The SIOX Nanospheres were used to fill the valleys of silicon pyramids, which is said to improve the coverage of the self-assembled monoles (SAMs) of the cell and enables a “more effective” perovskiet deposit. In earlier research, aluminum oxide (Al₂O₃) nanoparticles or polymethyl methacrylate (PMMA) were used for this purpose. Compared to these two connections, SIOX It is claimed that it has the possibility to settle in the pyramid valleys of the structured silicon surface during the spin coating process.
The silicon substrates were then covered with a Sam made of a phosphonic acid known as 2pacz.
The upper perovskiet cell was built with a substrate made on IndiumTin oxide (ITO) and the proposed SAM, a perovskietabsorber, a tin (iv) oxide (SNO2) Buffer Layer, an electron transport layer made from Buckminsterfullerene (C60), A transparent back contact made from indium zinc oxide (IZO), and a silver (AG) metal contact.
Tested under standard lighting conditions, the 1 cm2 tandem cell achieved a power conversion efficiency of 33.15%, which the scientists described as the highest efficiency ever reported so far for monolithic perovskiet-silical tandem solar cells that use this.
“In particular, we discovered that the buried interface of perovskites at the bottom of Pyramid Valleys was reinforced in the tandems, which demonstrated a superior stability compared to tandems with submicron -structured silicium (STS),” The academic, stressed, only 7.%COUNNEM.
The device configuration was presented in the study “Iceberg-like pyramids in industrially structured silicon made 33% efficient perovskiet-silicon tandem solar cells possible“Published in Nature communication.
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