JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE) ›› 2021, Vol. 56 ›› Issue (10): 72-78.doi: 10.6040/j.issn.1671-9352.9.2021.002

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Photoelectric properties of organic chiral molecular devices

XIE Shi-jie1, 2*, GAO Teng1, DU Meng-zhao1, LIU Xuan1   

  1. 1. School of Physics, Shandong University, Jinan 250100, Shandong, China;
    2. State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, Shandong, China
  • Published:2021-09-28

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Abstract: At present, many organic chiral molecular devices have been successfully developed, but there are still many unsolved mysteries in their functional mechanism. Among them, the sources of the circular dichroism of chiral molecules and chiral-induced spin selectivity effect are the core of organic chiral molecular researches. To provide the theoretical guidance for the design of new functional organic devices based on chirality, this paper considers the spin-orbit coupling induced by helical potential field of organic chiral molecules to carry out a series of researches on the photoelectric characteristics and regulation of organic chiral molecules. According to the photo-induced transition theory, the optical absorption spectrum and circular dichroism of chiral molecules are obtained. It is found that the optical absorption peak is split, and the circular dichroism is contributed by orbital magnetic moment and spin magnetic moment. In addition, the source of chiral induced spin selectivity effect is explained from the polaron transport picture. Based on its electrical transport characteristics, a chiral heterojunction device is designed. It is found that its chiral resistance is up to 7% and the rectification ratio is up to 48.

Key words: chirality, CISS effect, spin filtering, circular dichroism(CD), spin-orbit coupling

CLC Number: 

  • O469
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