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Near-infrared non-fused electron acceptors for efficient organic photovoltaics
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Developing narrow-bandgap organic semiconductors is important to facilitate the advancement of or-ganic photovoltaics(OPVs).Herein,two near-infrared non-fused ring acceptors(NIR NFRAs),PTBFTT-F and PTBFTT-Cl have been developed with A-πA-π D-D-πD-πA-A non-fused structures.It is revealed that the introduction of electron deficient π-bridge(πA)and multiple intramolecular noncovalent interac-tions effectively retained the structural planarity and intramolecular charge transfer of NFRAs,extending strong NIR photon absorption up to 950 nm.Further,the chlorinated acceptor,with the enlarged π-surface compared to the fluorinated counterpart,promoted not only molecular stacking in solid,but also the desirable photochemical stability in ambient,which are helpful to thereby improve the exciton and charge dynamics for the corresponding OPVs.Overall,this work provides valuable insights into the design of NIR organic semiconductors.
Organic photovoltaicNear-infraredNon-fused electron acceptorNoncovalent interactionStability
Wenxiang Ma、Xinyu He、Tianyi Chen、De-Li Ma、Hongzheng Chen、Chang-Zhi Li
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State Key Laboratory of Silicon and Advanced Semiconductor Materials,Department of Polymer Science and Engineering,Zhejiang University,Hangzhou 310027,China
国家自然科学基金National Key Research and Devel-opment Program of China中央高校基本科研业务费专项
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