Improving perovskite solar cell performance using conductive adhesive ink – pv magazine International


The new conductive adhesive ink, conceived by Iranian researchers, is made of polymethylmethacrylate (PMMA) and serves as an intermediate layer between the battery’s hole transport layer and the carbon foil. It reportedly ensures greater battery stability while also delivering superior efficiency.

A team of scientists led by Iran’s Sharif University of Technology has developed a new conductive adhesive ink that can be used as an interfacial adhesive layer in perovskite solar cells.

“The purpose of the sticky ink is to improve battery stability and efficiency,” said Nima Taghavinia, corresponding author of the study. Optoelectronics Magazine. “We developed a low-cost and simple process that is compatible with large-area applications.”

The adhesive is made from polymethylmethacrylate (PMMA), a polymer widely used as a glass replacement in various industries, offering low cost, excellent mechanical, electrical and optical properties, thermal and environmental stability Sex, light weight, high temperature resistance and other advantages. It serves as an interface layer between the battery’s hole transport layer (HTL), made of copper indium sulfide (CuInS2) nanoparticles, and the top carbon foil, which relies on highly conductive carbon black (HCCB).

The adhesive is embedded in a cell consisting of a substrate made of fluorine-doped tin oxide (FTO) and a carbon-titanium dioxide-based electron transport layer (ETL).C/TiO2), TiO2 mesoporous layer, perovskite absorber, CuInS2 based HTL and top carbon foil with HCCB.

The researchers note that this battery configuration without the new binder has previously proven unstable, as the carbon electrodes often fell off after measurements.

“Conductive adhesive ink was dispensed onto a carbon foil with an area of ​​0.27 cm2,” the researchers said of the adhesive deposition process. “The carbon foil was then transferred onto the prepared FTO glass/c-TiO2/mp-TiO2/perovskite/CuInS2 stack, bringing the adhesive ink into contact with the HTL.”

Through a series of tests, the research team found that PMMA is the key to achieving stable and reliable bonding between carbon foil and batteries. It also explains that adding CuInS2 nanoparticles to the ink allows the adhesive to align with the underlying HTL, while the CuInS2 nanoparticles contribute to the hole transport mechanism.

“Our results show that adding 2%wt HCCB nanoparticles to PMMA/CIS mixture at a ratio of 1:3 achieves maximum conductivity of the adhesive interface layer, resulting in a maximum efficiency of 17.2%, which is consistent with gold The base corresponds to the proportion of cells (18.2%),” the scholar said. “Moreover, using the proposed carbon laminated electrode, we achieved a long-term stability of approximately 92% after 54 days of storage, which is an improvement of approximately 17% compared to the stability of gold-based electrodes.”

Their findings can be found in the study “Conductive adhesive ink for carbon-laminated perovskite solar cells with enhanced stability and high efficiency,” published in solar energy.

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