by Riko Seibo
Tokyo, Japan (SPX) Jan 19, 2026
Researchers on the College of Engineering at The Hong Kong College of Science and Know-how have developed a sturdy coating layer that considerably improves the operational stability of perovskite photo voltaic cells whereas sustaining excessive effectivity. In accelerated checks simulating intense noon daylight at 85 C, the coated cells retained greater than 95 % of their preliminary energy conversion effectivity after over 1,100 hours of steady operation, demonstrating sturdy potential for out of doors deployment in real-world situations.
Perovskite photo voltaic cells are recognized for his or her excessive effectivity and comparatively low manufacturing price, however their restricted long run stability has been a key impediment to commercialization. A extensively used technique to deal with this subject is to coat a 3 dimensional perovskite absorber with a skinny low dimensional perovskite layer that passivates floor defects and improves gadget voltage. Nevertheless, typical low dimensional layers are usually shaped from monovalent ammonium salts that bind weakly to the perovskite lattice and have a tendency to degrade below warmth and illumination, inflicting speedy efficiency loss.
To beat this limitation, Dr. Chang Xiao Ming, a postdoctoral fellow within the Division of Electronics and Laptop Engineering at HKUST, and colleagues designed a brand new class of multivalent amidinium ligands that act as a molecular velcro like interface. These ligands anchor to the perovskite floor at a number of factors by two nitrogen websites of their headgroup, making a multi level grip that stabilizes the low dimensional layer below working situations. Their flat molecular form and resonance stabilized cost distribution allow stronger hydrogen bonding with halide ions and better resistance to thermal and light-weight induced degradation.
Dr. Chang stated that conventional ammonium halide molecules can diffuse into the perovskite bulk at elevated temperatures, the place they both break down or react with the natural ion formamidinium, undermining the protecting operate of the low dimensional layer. In distinction, the multivalent amidinium ligands stay on the interface and protect the integrity of the floor construction over time. This habits helps gradual the chemical pathways that usually drive gadget ageing and effectivity losses.
Co writer Prof. Lin Yen Hung, an assistant professor within the Division of Digital and Laptop Engineering at HKUST, highlighted the usage of operando hyperspectral imaging to watch gadget habits below lifelike working situations. With this method, the staff mapped the perovskite layer pixel by pixel below open circuit, most energy level, and brief circuit situations throughout accelerated ageing. Units incorporating the molecular velcro interface confirmed virtually unchanged photoluminescence patterns and spectra, indicating a secure interface and an intact perovskite absorber layer even below prolonged stress.
A central facet of the work is the power to tune the basicity of a nitrogen atom inside a pyridine group within the ligand construction. The researchers discovered that in low dimensional perovskite buildings, amidinium ligands disrupt the absolutely three dimensional crystal community and permit steel halide octahedra to reorganize into one dimensional chains or two dimensional sheets. By fastidiously adjusting ligand basicity and molecular conformation, they transformed the floor perovskite from a one dimensional chain like stacking motif right into a hydrogen bonded two dimensional sheet like community that types a steady and uniform protecting coating.
Utilizing this three dimensional to 2 dimensional interface engineering technique in inverted perovskite photo voltaic cells, the staff achieved an authorized regular state energy conversion effectivity of 25.4 % on cells with an energetic space of about 1.1 sq. centimeters. For mini modules with an space of 6.82 sq. centimeters, the units reached 24.2 % effectivity. Based on the researchers, these values place their units among the many high performing inverted perovskite photo voltaic cells reported thus far for related energetic areas.
To systematically assess sturdiness, the staff adopted the Worldwide Summit on Natural Photovoltaic Stability (ISOS) protocol, a extensively adopted normal for evaluating perovskite photo voltaic cell lifetimes. Below the ISOS L 2 check, encapsulated units operated repeatedly at their optimum working level below one solar equal illumination, similar to shiny noon daylight, at 85 C in air. Even below these demanding situations, the cells incorporating the molecular velcro interface retained greater than 95 % of their preliminary effectivity after 1,100 hours, underscoring the robustness of the interface design.
Prof. Lin famous that, to the most effective of the staff’s information, the licensed stabilized effectivity they obtained is the very best reported in a peer reviewed publication for inverted perovskite photo voltaic cells with an energetic space of round 1 sq. centimeter. The work demonstrates how tremendous management over molecular stage interactions on the perovskite floor can translate into each file stage effectivity and considerably improved gadget lifetime. The findings additionally counsel a normal pathway for engineering secure three dimensional low dimensional perovskite heterostructures for future photovoltaic applied sciences.
The analysis, printed within the journal Science, seems in a paper titled Multivalent ligands regulate dimensional engineering for inverted perovskite photo voltaic modules. The examine concerned collaboration with a number of worldwide establishments, together with King Abdullah College of Science and Know-how, The Chinese language College of Hong Kong, Shenzhen, Shaanxi Regular College, Korea College, the Nationwide College of Singapore, the Nationwide Technical College of Athens, and the College of Manchester. Contributors from HKUST included Prof. Lin’s analysis group and Dr. Fion Yeung Sze Yan, Senior Supervisor on the State Key Laboratory of Shows and Opto Electronics.
Analysis Report: Multivalent ligands regulate dimensional engineering for inverted perovskite solar modules
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Hong Kong University of Science and Technology
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