by Riko Seibo
Tokyo, Japan (SPX) Apr 23, 2026
Researchers from Dalian College of Expertise, Fudan College, and Metropolis College of Hong Kong have developed a molecular design technique that pushes PTAA-based perovskite photo voltaic cells (PSCs) past 26% effectivity. Led by Professor Ze Yu, Professor Yingguo Yang, and Professor Hin-Lap Yip, the group addressed a persistent bottleneck in 2D/3D heterojunction units: poor provider transport attributable to quantum effectively results and structural mismatches on the perovskite/PTAA interface.
The strategy makes use of pi-conjugation extension of triphenylamine-based semiconducting ligands. Two new ligands had been designed – N-TPEAI (fused-ring) and P-TPEAI (covalently-linked) – with structural similarities to the PTAA spine itself. Density practical principle calculations reveal that P-TPEAI’s versatile biphenyl tail allows parallel-displaced pi-pi stacking with a number of cost channels, attaining bigger binding energies (-16.42 eV) and hole-transfer integrals (118.8 meV) than its fused-ring counterpart. This enhanced intermolecular coupling strengthens interactions each inside the 2D perovskite layers and on the perovskite/PTAA interface, creating synergistic pathways for gap transport.
The optimized 2D/3D PSCs ship a champion effectivity of 26.13% – the best reported for PTAA-based units – with an open-circuit voltage of 1.201 V and a fill issue of 83.96%. Transient photocurrent decay accelerates from 3.82 microseconds to 1.32 microseconds, whereas Mott-Schottky evaluation confirms decreased non-radiative recombination.
Stability efficiency is equally sturdy. Unencapsulated units retained 84.9% of preliminary efficiency after 1,000 hours beneath the ISOS-L-2 light-heat stress protocol, demonstrating distinctive resistance to the circumstances that usually degrade perovskite units in real-world deployment.
The work establishes molecular engineering tips for natural spacer design in PSCs, with broad applicability anticipated in inverted architectures and tandem cell configurations. The outcomes are revealed within the journal Nano-Micro Letters.
Analysis Report:Interfacial Coupling Design Enhancing Gap Transport in PTAA-Based mostly Perovskite Photo voltaic Cells with Effectivity over 26%
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Shanghai Jiao Tong College Journal Heart
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