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

Min Cao, Cong Zhang, Zhi Cai, Chengcheng Xiao, Xiaosong Chen, Kongyang Yi, Yingguo Yang, Yunhao Lu and Dacheng Wei ()
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Min Cao: Fudan University
Cong Zhang: Fudan University
Zhi Cai: Fudan University
Chengcheng Xiao: Zhejiang University
Xiaosong Chen: Fudan University
Kongyang Yi: Fudan University
Yingguo Yang: Chinese Academy of Sciences
Yunhao Lu: Zhejiang University
Dacheng Wei: Fudan University

Nature Communications, 2019, vol. 10, issue 1, 1-11

Abstract: 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.

Date: 2019
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DOI: 10.1038/s41467-019-08573-8

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