Sunday, July 21, 2024

New encapsulant for perovskite photo voltaic cells, modules withstands a number of accelerated ageing checks – pv journal International


Italian researchers have developed a low-temperature blanket-cover encapsulation approach that reportedly improves the steadiness of perovskite PV units. They say that the brand new approach reduces the thermomechanical stresses brought on by the encapsulation course of and the temperature gradients that happen throughout accelerated getting old stresses.

A group of researchers led by Tor Vergata University of Rome in Italy has developed a novel perovskite photo voltaic cell and module encapsulation course of that supposedly will increase machine stability with out the necessity for superior perovskite chemistries with excessive which is inside stability or particular edge sealant.

The group mentioned their novel encapsula reduces thermomechanical stresses on the interface of the encapsulant and rear electrode. It relies on a extremely viscoelastic liquid adhesive polyisobutylene (PIB) materials and is characterised as an industrially suitable answer that doesn’t require solvents in a strain-free lamination course of.

“In this work, totally different from the commercially accessible PIB-based encapsulants generally used within the literature for perovskite photo voltaic cells, we suggest the low-molecular weight homopolymer PIB as a clear, viscoelastic, semi-solid liquid processable within the type of laminable movies,” the scientists. gap. Furthermore, we present that the adhesion, barrier and thermal administration properties of our homopolymer PIB encapsulant will be improved by including two-dimensional (2D) inorganic fillers, specifically few-layer hexagonal boron nitride (h-BN) (nano) particles produced on an industrial scale by the patented wet-jet milling (WJM) exfoliation means of the native bulk powder.

The lecturers examined their answer on photo voltaic cells made from glass substrates with each mesoscopic and planar nip configurations, plus a cell with an inverted pin configuration. A semi-transparent bifacial specimen was additionally examined. Researchers have additionally developed modules primarily based on mesoscopic nip cells made with an absorber primarily based on methylammonium (MA) perovskite materials.

They examined two variations of the novel encapsulant. One with two-dimensional fillers made from a boron nitride materials (PIB:h-BN) and one with out. The cells measure 1 cm2, whereas the modules have an energetic space of ​​10 cm2, primarily based on 5 cells with an energetic space of ​​2 cm2.

The units are encapsulated at 90 C in a differential stress lamination course of primarily based on an automated two-chamber photo voltaic panel laminator offered by the Italian specialist Rise Technology, with a cooling system. The cells and modules are subjected to a number of accelerated getting old checks, in addition to a custom-made thermal shock check and a modified humidity freeze check.

“The addition of thermally conductive two-dimensional hexagonal boron nitride to the polymeric matrix improves the barrier and thermal administration properties of the encapsulant,” mentioned the researchers. “Without any edge sealant, the encapsulated units withstood a number of phase-accelerated getting old checks, retaining greater than 80% of their preliminary effectivity.”

The group sees the work as a step towards long-term steady modules made with low-temperature and cost-effective encapsulants that can be utilized in high-throughput manufacturing strains, enabling perovskite photo voltaic cells to be aggressive with typical crystalline silicon photo voltaic applied sciences. It additionally envisions compatibility with a variety of perovskite compositions.

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“Overall, our outcomes present that semi-solid/liquid encapsulation ideas effectively scale back thermal and thermomechanical stresses throughout encapsulant utility, whereas offering good barrier efficiency for the belief of long- time period steady PSCs and PSMs, aiming to face the competitors of Si-based PVs,” ​​concluded the group.

The work is detailed within the paper “Low-temperature strain-free encapsulation for perovskite photo voltaic cells and modules that go multifaceted accelerated getting old checks,” printed in environmental communication. The analysis group consists of scientists from the Università di Genova, Institute of Structure of Matter (ISMCNR), the Italian National Research Council (CNR), and Istituto Italiano di Tecnologia.

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