Geometric and Electronic Behavior of C60 on PTCDA Hydrogen Bonded Network

doi:10.1007/s40242-020-9099-0

Chemical Research in Chinese Universities ›› 2020, Vol. 36 ›› Issue (1): 81-85.doi: 10.1007/s40242-020-9099-0

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Geometric and Electronic Behavior of C₆₀ on PTCDA Hydrogen Bonded Network

LI Ling, LI Xuechao, TANG Yanning, XU Zhichao, ZHANG Haiming, CHI Lifeng

Institute of Functional Nano & Soft Materials(FUNSOM), Soochow University, Suzhou 215123, P. R. China

Received:2019-12-15 Revised:2020-01-02 Online:2020-02-01 Published:2020-01-03
Contact: ZHANG Haiming, CHI Lifeng E-mail:hmzhang@suda.edu.cn;chilf@suda.edu.cn
Supported by:
Supported by the National Natural Science Foundation of China(Nos.21673154, 21790053) and the Project of the Ministry of Science and Technology of China(No.2017YFA0205002).

Abstract

Abstract: Self-assembled supramolecular networks are promising spacer layer for electronic decoupling from the metal substrate. However, the mechanism behind of how the intrinsic electronic structure of spacer layers affects the adsorbate is still unclear. Here a hydrogen bonded network composed of n-type semiconducting molecules 3,4,9,10-perylene-tetracarboxylic-dianhydride(PTCDA) is prepared under ultra-high vacuum to serve as a spacer layer for functional organics C₆₀ on Au(111). The geometric and electronic information of C₆₀ was investigated by scanning tunneling microscopy and scanning tunneling spectroscopy(STM/STS) at 5 K. Effective decoupling from the metal surface yields an energy gap of 3.67 eV for C₆₀^2nd, merely considering the HOMO-LUMO peak separation. The broadening of resonance peaks in STS measurements however indicates unneglected interlayer interactions in this hetero-organic system. Moreover, we scrutinize the nucleation sites of C₆₀ on PTCDA layer and attribute this to the decreased diffusion capability on a less dense molecular arrangement possessing inhomogeneous spatial distribution of unoccupied molecular orbitals.

Key words: Electronic decoupling, Scanning tunneling microscopy/spectroscopy, C₆₀, 3,4,9,10-Perylene-tetracarbo-xylic-dianhydride(PTCDA)

LI Ling, LI Xuechao, TANG Yanning, XU Zhichao, ZHANG Haiming, CHI Lifeng. Geometric and Electronic Behavior of C₆₀ on PTCDA Hydrogen Bonded Network[J]. Chemical Research in Chinese Universities, 2020, 36(1): 81-85.

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Geometric and Electronic Behavior of C₆₀ on PTCDA Hydrogen Bonded Network

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