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Asymmetric selenophene-based non-fullerene acceptors for high-performance organic solar cells
Li, Chao,Xia, Tian,Song, Jiali,Fu, Huiting,Ryu, Hwa Sook,Weng, Kangkang,Ye, Linglong,Woo, Han Young,Sun, Yanming The Royal Society of Chemistry 2019 Journal of materials chemistry. A, Materials for e Vol.7 No.4
<P>Compared to thiophene-based non-fullerene acceptors (NFAs), selenophene-based NFAs have received much less attention. And organic solar cells (OSCs) based on selenophene-containing NFAs typically exhibit relatively low power conversion efficiency (PCE < 12%) and fill factor (FF < 70%). In this contribution, we have designed and synthesized two asymmetric selenophene-based NFAs, named SePTT-2F and SePTTT-2F, which possess the same end-capping group but different selenophene-containing conjugated backbones. On comparing the two NFAs, SePTTT-2F with more extended conjugation in the backbone was found to have almost the same maximum absorption peak and optical bandgap in film as SePTT-2F but an up-shifted lowest unoccupied molecular orbital (LUMO) energy level and higher electron mobility. By pairing the NFAs with the polymer donor PBT1-C, the resultant blend film based on SePTTT-2F exhibited higher and more balanced charge mobilities and more efficient exciton dissociation and charge collection in comparison with the SePTT-2F-based blend film. As a result, OSCs based on SePTTT-2F delivered an impressively high PCE of 12.24% with an outstanding FF of 75.9%, much higher than those of the SePTT-2F-based OSCs. To the best of our knowledge, the PCE of 12.24% and FF of 75.9% are among the highest values reported in the literature so far for both the parameters amongst selenophene-containing NFA-based OSCs. Our results demonstrate that extending the conjugation in the selenophene-containing backbone is an effective strategy to design highly efficient selenophene-based NFAs.</P>
Effect of a Bubble Gas on the Formation of Self-Organized Pore Arrays in Anodic Aluminum Oxide
VanChiem Chu,Huiting Li,김희동,서재명 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.6
Based on different morphologies of both sides of an anodic aluminum oxide (AAO) membrane detached from an Al substrate, we proposed that the bubble gas generated at the interface between the Al substrate and an aqueous solution plays a critical role in forming self-organized hexagonal pore arrays in anodic alumina. Such a proposal not only successfully explains the experimental observation that hexagonal pore arrays are ordered better on a flatter substrate at the initial stage of oxidation but also corrects the previously proposed `continuous model,' putting emphasis on the surface depression for pore initiation and predicting ordered hemispherical pore tips at the interface between the AAO and the Al substrate.