by Riko Seibo
Tokyo, Japan (SPX) Dec 14, 2025
Researchers from Beijing Regular College and Qingdao College have developed a nonfused ring electron acceptor (NFREA) known as TT-Ph-C6 that improves the efficiency of thick-film natural photo voltaic cells. The fabric targets limitations in film-thickness tolerance and fill issue which have held again NFREAs in contrast with fused-ring acceptors.
The group, led by Prof. Zhishan Bo, Prof. Cuihong Li, Prof. Yahui Liu and Prof. Hao Lu, used an uneven side-group engineering technique on TT-Ph-C6. This design led to gadgets with a fill issue of 80.1 %, reported as the very best worth up to now for NFREA-based natural photo voltaic cells.
TT-Ph-C6-based gadgets reached an influence conversion effectivity (PCE) of 18.01 % whereas sustaining efficiency at elevated active-layer thickness. The cells delivered a PCE of 15.18 % at 200 nanometers and 14.64 % at 300 nanometers, inserting these outcomes among the many strongest efficiencies reported for non-fused acceptors at such thicknesses.
Structurally, TT-Ph-C6 incorporates uneven phenylalkylamino facet chains that improve solubility and promote compact three-dimensional molecular stacking. The crystal construction reveals robust p-p interactions with a stacking distance of three.21 angstroms and a number of S—O/N noncovalent locks that assist a dense packing community.
These structural options assist balanced cost transport within the energetic layer. Electron mobility reaches 2.48 + 10^-4 cm2 V^-1 s^-1, and the ratio of electron to gap mobility (ue/uh) is near 1 in thick movies, serving to to protect short-circuit present and fill issue.
The researchers additionally report prolonged exciton diffusion and environment friendly cost switch in TT-Ph-C6 blends. The exciton diffusion size is 17.2 nanometers, in contrast with 13.4 nanometers for a symmetric reference materials, and the opening switch effectivity reaches 91.2 %, which helps suppress recombination losses.
Machine fabrication used o-xylene as a processing solvent, avoiding halogenated components. The group is now engaged on scaling wide-strip coating processes towards meter-scale versatile modules appropriate for roll-to-roll manufacturing.
Future work will broaden the library of uneven facet chains to focus on tandem architectures and decrease bandgap programs. The outcomes spotlight side-chain design as a sensible path to cost-effective, high-efficiency thick-film natural photo voltaic cell applied sciences.
Analysis Report:Asymmetric Side-Group Engineering of Nonfused Ring Electron Acceptors for High-Efficiency Thick-Film Organic Solar Cells
Associated Hyperlinks
Shanghai Jiao Tong University Journal Center
All About Solar Energy at SolarDaily.com
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