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Enhanced photoelectrical response of thermodynamically epitaxial organic crystals at the two-dimensional limit

Author

Listed:
  • Min Cao

    (Fudan University
    Fudan University)

  • Cong Zhang

    (Fudan University
    Fudan University)

  • Zhi Cai

    (Fudan University
    Fudan University)

  • Chengcheng Xiao

    (Zhejiang University)

  • Xiaosong Chen

    (Fudan University
    Fudan University)

  • Kongyang Yi

    (Fudan University
    Fudan University)

  • Yingguo Yang

    (Chinese Academy of Sciences)

  • Yunhao Lu

    (Zhejiang University)

  • Dacheng Wei

    (Fudan University
    Fudan University)

Abstract

Owing to strong light-matter interaction, two-dimensional (2D) organic crystal is regarded as promising materials for ultrasensitive photodetectors, however it still received limited success due to degraded photoelectrical response and problems in controllable growth. Here, we find the growth of 2D organic crystal obeys Gibbs-Curie-Wulff law, and develop a seed-epitaxial drop-casting method to grow millimeter-sized 1,4-bis(4-methylstyryl)benzene 2D crystals on SiO2/Si in a thermodynamically controlled process. On SiO2/Si, a distinct 2D limit effect is observed, which remarkably enhances internal photoresponsivity compared with bulk crystals. Experiment and calculation show the molecules stack more compactly at the 2D limit, thus better molecular orbital overlap and corresponding changes in the band structure lead to efficient separation and transfer of photo-generated carriers as well as enhanced photo-gating modulation. This work provides a general insight into the growth and the dimension effect of the 2D organic crystal, which is valuable for the application in high-performance photoelectrical devices.

Suggested Citation

  • Min Cao & Cong Zhang & Zhi Cai & Chengcheng Xiao & Xiaosong Chen & Kongyang Yi & Yingguo Yang & Yunhao Lu & Dacheng Wei, 2019. "Enhanced photoelectrical response of thermodynamically epitaxial organic crystals at the two-dimensional limit," Nature Communications, Nature, vol. 10(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-08573-8
    DOI: 10.1038/s41467-019-08573-8
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