Translucent perovskite solar cell with 11.6% efficiency



Italian researchers have used a titanium oxide sponge to successfully prevent lead leakage in a semi-transparent solar cell. The device has demonstrated comparable efficiency to semi-transparent perovskite devices, with an average visible transmittance (AVT) of 31.4%.

“We designed the solar cell for applications in building-integrated photovoltaics (BIPV) and agricultural electricity, where possible lead leakage can be considered a serious source of public environmental and health risk,” researcher Salvatore Valastro said. pv magazine.

TiO2, a highly adsorptive material, acts as an efficient electron transport layer (ETL) in perovskite solar cells. To address potential lead (Pb) leakage, the researchers created a solvent-free porous TiO2 film that formed a sponge-like structure capable of trapping Pb from damaged cells during simulated disasters.

“The TiO2 sponge can bind Pb at concentrations ranging from 24 g cm2 to 63 g cm2 contained in MAPbI3 layers with thicknesses of 200 nm (semi-transparent PSC) to 500 nm (opaque PSC), respectively,” the researchers explained.

They built the cell from a substrate made of glass and indium tin oxide (ITO), a hole transport layer (HTL) made of polytriarylamine (PTAA), a perovskite absorber with a TIO2 sponge, electron acceptor made of phenyl C61 butyric acid methyl ester (PCBM), bathocuproin (BCP) buffer layer, gold (Au) metal contact, and TIO2 sponge.

“We deposited the sponge using a physical solvent-free coating method using sputtering equipment, an easily scalable method widely used by semiconductor manufacturers,” Valastro said. “Before the coating process, a 1-minute prespray step is performed to clean the surface of the titanium target to remove oxidized layers.”

The solar cell’s power conversion efficiency was 11.6% and its average visible transmittance (AVT) is 31.4%. “An efficiency of 11.6% is characteristic of this semi-transparent architecture,” said Valastro.

The research team described the cell technology in the paper, “Suppressing Lead Leakage in Perovskite Solar Cells with a Durable Titanium Dioxide Sponge,” published recently The sustainability of nature.

“Our method represents a tangible step forward in reducing Pb emissions for BIPV, BAPV, agricultural electricity and opaque devices, and also paves the way for Pb recycling in end-of-life devices,” the team concluded.

David is a passionate writer and researcher who specializes in solar energy. He has a strong background in engineering and environmental science, which gives him a deep understanding of the science behind solar power and its benefits. David writes about the latest developments in solar technology and provides practical advice for homeowners and businesses who are interested in switching to solar.

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