Researchers at Xi’an Jiaotong College and Uppsala College have created a brand new movie that sticks higher to perovskite photo voltaic cells, making them extra secure and environment friendly.

Photovoltaic (PV) applied sciences have turn out to be more and more widespread in recent times, aiding efforts to scale back greenhouse gasoline emissions. Whereas most photo voltaic cells are silicon-based, different supplies like perovskites are gaining consideration for his or her potential to create cheaper photo voltaic cells with excessive energy conversion efficiencies. Nevertheless, perovskite photo voltaic cells (PSCs) are much less secure than their silicon counterparts, with efficiency typically declining underneath excessive temperatures and fluctuating environmental circumstances. A key problem lies of their reliance on hole-selective self-assembled monolayers (SAMs). These skinny molecular movies entice constructive cost carriers however typically fail to stick nicely to the cell floor, contributing to thermal instability.
Researchers from Xi’an Jiaotong College, Uppsala College, and different establishments have developed a self-assembled bilayer movie to handle this. Their research reveals that this bilayer construction adheres higher to PSCs, enhancing their thermal stability and efficiency.
The newly designed self-assembled bilayer improves standard SAMs by including an natural compound triphenylamine higher layer. This layer varieties covalent bonds with the phosphonic acid-based SAM, making a polymerized community.
The polymerized community, fashioned by Friedel–Crafts alkylation, demonstrated resistance to thermal degradation at temperatures as much as 100 °C for 200 hours. The higher layer’s face-on orientation enhanced adhesion to perovskite surfaces, growing the adhesion vitality by 1.7 occasions in comparison with the usual SAM–perovskite interface.
In checks, the bilayer adhered higher to perovskite surfaces than conventional monolayer SAMs. The manufacturing methodology is flexible, permitting it to be utilized to numerous SAM-forming molecules and alkylating brokers.
When utilized to inverted PSCs, the bilayer improved efficiency, reaching excessive power-conversion efficiencies whereas decreasing effectivity loss over time. The bilayer additionally enhanced stability underneath high-temperature circumstances. The gadgets achieved energy conversion efficiencies exceeding 26%. They demonstrated lower than 4% and three% effectivity loss after 2,000 hours of damp warmth publicity (85 °C and 85% relative humidity) and over 1,200 thermal cycles between −40 °C and 85 °C, assembly worldwide temperature stability requirements.
This method might pave the best way for creating different self-assembled bilayer movies to enhance PSC stability. Such developments might speed up the adoption of perovskite-based photovoltaics.
Reference: Bitao Dong et al, Self-assembled bilayer for perovskite photo voltaic cells with improved tolerance in opposition to thermal stresses, Nature Power (2025). DOI: 10.1038/s41560-024-01689-2.
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