en.Wedoany.com Reported - Professor Chen Jiangzhao and Professor Yu Yue from the School of Materials Science and Engineering at Kunming University of Science and Technology, in collaboration with multiple universities and enterprises, have made technological progress in the buried interface regulation of inverted perovskite solar cells. According to third-party authoritative certification, the photoelectric conversion efficiency of small-area single cells reached 27.12%, while the conversion efficiency of large-area photovoltaic modules measuring 655.2 square centimeters stabilized at 22.25%, significantly narrowing the performance gap between laboratory devices and mass-produced modules.
Inverted perovskite solar cells, which use self-assembled monolayers as the hole transport layer, offer the advantages of low-temperature preparation and low cost, making them a key direction for the photovoltaic industry. However, issues such as the tendency of self-assembled molecules to agglomerate, uneven film formation, numerous defects at the bottom of the perovskite film, weak adhesion, and interfacial residual stress have limited the large-scale production of this technology.
The research team proposed a soft supramolecular host-guest synergistic regulation strategy, introducing weakly Lewis basic molecules to modify the buried interface. Leveraging its bowl-shaped cavity structure, this molecule simultaneously achieves four key functions: uniformly spreading the self-assembled film to eliminate leakage pathways; filling interfacial defects through functional group coordination to reduce electrical energy loss; alleviating internal stress caused by thermal expansion and contraction via a flexible skeleton; and bridging the hole transport layer and the perovskite light-absorbing layer with bidirectional chemical bonds to inhibit ion migration.
Durability test data show that after 2,125 hours of continuous standard sunlight exposure, the device retained 97.4% of its initial efficiency; after aging for 2,000 hours in a damp-heat environment at 85 degrees Celsius and 85% relative humidity, performance maintained 90.7% of its original level, improving the stability shortcomings of perovskite solar cells.
The research team, in collaboration with photovoltaic enterprises, completed the preparation of large-area modules. The entire modification process is compatible with existing coating mass-production equipment, requiring no major modifications to the production line, making the implementation cost controllable. This technology can be applied in fields such as building-integrated photovoltaic semi-transparent curtain walls, flexible portable charging devices, new energy vehicle rooftop photovoltaic panels, and perovskite/silicon tandem solar cells.
