Enhancing quasi-2D perovskite photo voltaic cells with dicyandiamide interface engineering
by Riko Seibo
Tokyo, Japan (SPX) Sep 07, 2025
A analysis group led by Professors Pengwei Li, Yanlin Track, and Yiqiang Zhang has launched a dicyandiamide (DCD)-based molecular bridge technique that considerably advances quasi-2D alternating-cation-interlayer (ACI) perovskite photo voltaic cells. Revealed in Nano-Micro Letters, the examine outlines a dual-function interface engineering technique that enhances each effectivity and stability by passivating defects and regulating section distribution.
The workforce reported a report energy conversion effectivity of 21.54% for DCD-treated gadgets, in comparison with 19.05% in management samples. DCD decreased interfacial entice density by 73%, enabling sooner cost transport and decrease recombination charges. Lengthy-term testing confirmed handled gadgets retained 94% of their preliminary effectivity after 1200 hours, outperforming untreated cells which maintained solely 84%.
The effectiveness of DCD stems from its guanidine and cyano teams. The guanidine group binds undercoordinated Pb2+ ions and fills iodide or cation vacancies, whereas the cyano group coordinates with Ti4+ in TiO2, lowering oxygen vacancies and strengthening perovskite/ETL interfaces. DCD additionally suppressed low-n section aggregation whereas selling vertically aligned high-n phases, making certain uniform cost transport.
Spectroscopic and theoretical research confirmed the mechanism. XPS and FTIR validated DCD interactions with Pb and Ti, whereas oxygen emptiness ratios dropped from 48% to 33%. Transient absorption and photoluminescence research revealed extra homogeneous section distributions, and DFT calculations highlighted sturdy CN – Ti bonding, explaining the decreased entice formation.
Efficiency testing confirmed a VOC of 1.172 V, JSC of 23.08 mA cm-2, and FF of 79.6%. Lure densities decreased greater than threefold, and recombination resistance elevated to twenty.68 kO, highlighting environment friendly cost extraction. The gadgets maintained stability below 400 hours of steady illumination and 1200 hours of mixed thermal and environmental stress.
By integrating defect passivation with section homogenization, this strategy overcomes the standard efficiency-stability trade-off in 2D perovskite photovoltaics. The workforce suggests the technique may prolong to different perovskite-based optoelectronics, together with LEDs and photodetectors, offering a common platform for scalable, high-performance machine engineering.
Analysis Report:Dicyandiamide-Driven Tailoring of the n-Value Distribution and Interface Dynamics for High-Performance ACI 2D Perovskite Solar Cells
Associated Hyperlinks
Shanghai Jiao Tong University Journal Center
All About Solar Energy at SolarDaily.com
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