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首页> 外文期刊>Advanced Functional Materials >Molecular Consideration for Small Molecular Acceptors Based on Ladder-Type Dipyran: Influences of O-Functionalization and π-Bridges
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Molecular Consideration for Small Molecular Acceptors Based on Ladder-Type Dipyran: Influences of O-Functionalization and π-Bridges

机译：基于梯型双吡喃的小分子受体的分子考虑：O功能化和π桥的影响

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摘要

Molecular engineering of nonfullerene acceptors (NFAs) plays a vital role in the development of organic photovoltaics. Oxygen as an electron donating atom is incorporated into the NFA system as alkoxyl forms at central, terminal, or central conjugated moieties due to the tunability at structural conformation, solubility, electron donating ability, absorption, energy levels, etc. In this work, a novel dipyran-based ladder-type building block (Ph-DTDP), which possesses two oxygen atoms in the conjugated skeleton, is designed and facilely synthesized. It is applied as the donor core for the acceptor-donor-acceptor-type NFA design and such functionalized-O efficiently enhances the electron donating ability, lowers the band gap, redshifts and extends the absorption spectra. In addition, the pi-bridge effects are considered as well. Photovoltaic performances are systematically investigated and a high power conversion efficiency of 9.21% can be afforded with an energy loss of 0.57 eV. Meanwhile, the morphologies as well as the carrier mobilities of the blend films are studied to assist further understanding of the structure-property relationships. Overall, the study in this work provides a new promising ladder-type dipyran building block and brings in a novel way to use oxygen in NFA molecular structure design.
机译：非富勒烯受体（NFA）的分子工程在有机光伏的发展中起着至关重要的作用。由于结构构象，溶解度，给电子能力，吸收，能级等方面的可调性，作为供电子原子的氧以烷氧基形式在中心，末端或中心共轭部分掺入NFA系统。在这项工作中，设计并轻松合成了一种新颖的基于双吡喃的梯形结构单元（Ph-DTDP），该结构单元在共轭骨架中具有两个氧原子。它被用作受体-供体-受体型NFA设计的供体核，这种功能化的O可有效增强电子给体能力，降低带隙，红移并扩展吸收光谱。此外，还考虑了pi桥效应。系统地研究了光伏性能，可以提供9.21％的高功率转换效率，而能量损失为0.57 eV。同时，研究了共混膜的形态和载流子迁移率，以帮助进一步理解结构-性质关系。总的来说，这项工作的研究提供了一种新的有前途的阶梯型双吡喃构建基块，并带来了一种在NFA分子结构设计中使用氧气的新颖方法。

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