Abstract
Environmental screening effects are large in carbon nanotubes due to their atomically thin nature, and therefore it is possible to control the optical properties with molecular adsorption [1,2]. Here we investigate adsorption effects of copper phthalocyanine molecules on excitons and trions in air-suspended carbon nanotubes [3]. Using photoluminescence excitation spectroscopy, we observe that exciton energy redshifts gradually with the molecular deposition thickness. The trion emission is also observed at large deposition amounts, which suggests charge transfer between the phthalocyanine molecules and carbon nanotubes. Analyzing the spectra for individual tubes, we find a correlation between the exciton-trion energy separation and the exciton emission energy, indicating that the many-body interaction energies scale similarly with the molecular dielectric screening. Work supported in part by RIKEN (Incentive Research Projects), JSPS (KAKENHI JP16H05962, JP17H07359), and MEXT (Nanotechnology Platform). We acknowledge the Advanced Manufacturing Support Team at RIKEN for technical assistance. [1] T. Uda, A. Ishii, and Y. K. Kato, ACS Photonics 5, 559 (2018).[2] T. Uda, S. Tanaka, and Y. K. Kato, Appl. Phys. Lett. 113, 121105 (2018).[3] S. Tanaka, K. Otsuka, K. Kimura, A. Ishii, H. Imada, Y. Kim, and Y. K. Kato, arXiv:1812.10245 (2018).
Published Version
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