查看更多>>摘要：The rapid synthesis of structurally complicated electron donors & acceptors still remains a major challenge in organic solar cells(OSC).In this work,we developed a highly efficient strategy to access long-chain oligomeric donor and acceptors for OSC applica-tions.A series of cyclopentadithiophene(CPDT)and benzothiadiazole(BT)-based π-conjugated oligomers,i.e.,three oligomeric ac-ceptors(BTDT)n-IC(n=1-3)and one long-chain oligomeric donor(BTDT)4-RD,are facilely synthesized by an atom-and step-eco-nomical,and labor-saving direct C—H arylation(DACH)reaction(i.e.,C—H/C—Br cross coupling).Note that(BTDT)4-RD involving five CPDT,four BT and two rhodamine(RD)building blocks is the longest oligomeric donor in the fullerene-free OSC devices ever report-ed.The dependence of the structure-property-performance correlation of(BTDT)n-IC(n=1-3)and(BTDT)4-RD on the π-conjugation lengths is thoroughly investigated by opto-electrochemical measurements,bulk heterojunction(BHJ)OSC devices and microscopies.The(BTDT)1-IC∶PBDB-T and(BTDT)4-RD∶Y6 BHJs achieve power conversion efficiencies of 9.14％and 4.51％,respectively.Our findings demonstrate that DACH reaction is a powerful tool to tune the opto-electronic properties and device performances by regulating the lengths of π-conjugated oligomers with varied numbers of repeating units.
查看更多>>摘要：As the chemical industry grapples with the need for more eco-friendly practices,the use of water as a reaction medium is gaining at-traction in organic transformations.This mini-review delves into Pd-catalyzed reactions that utilize the"on-water"mechanism,span-ning from 2019 to late 2023.These reactions are neatly categorized into several types:(A)Catalytic C—H activations,(B)Mizoroki-Heck-type reactions,(C)Suzuki-Miyaura reactions,and(D)Cyclization reactions.By showcasing the potential of water as a sustaina-ble reaction medium for organic transformations,these reactions leave no doubt about the importance of embracing eco-friendly practices in the chemical industry.
查看更多>>摘要：The issue of energy consumption has garnered significant interest due to its excessive usage.Recently,thermoelectric devices have been getting increased attention,as they can harness waste heat from various sources,such as solar radiation,human body,and in-dustrial processes.Traditionally,the recovery of low-grade heat has been a challenge,resulting in unsustainable energy use and sig-nificant losses.While considerable advances have been made in thermoelectric materials in recent decades,the majority of these devices still primarily employ semiconductors.Nevertheless,the emergence of quasi-solid-state thermoelectric materials represents a novel development with profound promise for the environment and society.These materials offer several advantages,such as im-proved energy conversion capacities,cost-effectiveness,versatility,and scalability,to support increased usage.Additionally,this re-view explores the application of thermoelectric materials in self-powered sensors,integrated modules,and heat harvesting man-agement.Lastly,the potential of high-performance thermocouples based on thermogalvanic effects is assessed,along with the chal-lenges that must be overcome to realize this goal.
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