Mechanistic Investigation of Molybdenum Disulfide Defect Photoluminescence Quenching by Adsorbed Metallophthalocyanines.

Autor: Amsterdam SH; Department of Chemistry and the Materials Research Center, Northwestern University, Evanston, Illinois 60208, United States., Stanev TK; Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208, United States., Wang L; Center for Nanoscale Materials, Argonne National Laboratory, Lemont, Illinois 60439, United States.; Department of Materials Science and Engineering and the Materials Research Center, Northwestern University, Evanston, Illinois 60208, United States., Zhou Q; Center for Nanoscale Materials, Argonne National Laboratory, Lemont, Illinois 60439, United States.; Department of Materials Science and Engineering and the Materials Research Center, Northwestern University, Evanston, Illinois 60208, United States., Irgen-Gioro S; Department of Chemistry and the Materials Research Center, Northwestern University, Evanston, Illinois 60208, United States., Padgaonkar S; Department of Chemistry and the Materials Research Center, Northwestern University, Evanston, Illinois 60208, United States., Murthy AA; Department of Materials Science and Engineering and the Materials Research Center, Northwestern University, Evanston, Illinois 60208, United States., Sangwan VK; Department of Materials Science and Engineering and the Materials Research Center, Northwestern University, Evanston, Illinois 60208, United States., Dravid VP; Department of Materials Science and Engineering and the Materials Research Center, Northwestern University, Evanston, Illinois 60208, United States.; Northwestern University Atomic and Nanoscale Characterization Experimental (NUANCE) Center, Evanston, Illinois 60208, United States., Weiss EA; Department of Chemistry and the Materials Research Center, Northwestern University, Evanston, Illinois 60208, United States.; Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208, United States.; Department of Materials Science and Engineering and the Materials Research Center, Northwestern University, Evanston, Illinois 60208, United States., Darancet P; Center for Nanoscale Materials, Argonne National Laboratory, Lemont, Illinois 60439, United States.; Northwestern Argonne Institute of Science and Engineering, Evanston, Illinois 60208, United States., Chan MKY; Center for Nanoscale Materials, Argonne National Laboratory, Lemont, Illinois 60439, United States.; Northwestern Argonne Institute of Science and Engineering, Evanston, Illinois 60208, United States., Hersam MC; Department of Chemistry and the Materials Research Center, Northwestern University, Evanston, Illinois 60208, United States.; Department of Materials Science and Engineering and the Materials Research Center, Northwestern University, Evanston, Illinois 60208, United States.; Department of Electrical and Computer Engineering and the Materials Research Center, Northwestern University, Evanston, Illinois 60208, United States., Stern NP; Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208, United States., Marks TJ; Department of Chemistry and the Materials Research Center, Northwestern University, Evanston, Illinois 60208, United States.; Department of Materials Science and Engineering and the Materials Research Center, Northwestern University, Evanston, Illinois 60208, United States.
Jazyk: angličtina
Zdroj: Journal of the American Chemical Society [J Am Chem Soc] 2021 Oct 20; Vol. 143 (41), pp. 17153-17161. Date of Electronic Publication: 2021 Oct 06.
DOI: 10.1021/jacs.1c07795
Abstrakt: Lattice defects play an important role in determining the optical and electrical properties of monolayer semiconductors such as MoS 2 . Although the structures of various defects in monolayer MoS 2 are well studied, little is known about the nature of the fluorescent defect species and their interaction with molecular adsorbates. In this study, the quenching of the low-temperature defect photoluminescence (PL) in MoS 2 is investigated following the deposition of metallophthalocyanines (MPcs). The quenching is found to significantly depend on the identity of the phthalocyanine metal, with the quenching efficiency decreasing in the order CoPc > CuPc > ZnPc, and almost no quenching by metal-free H 2 Pc is observed. Time-correlated single photon counting (TCSPC) measurements corroborate the observed trend, indicating a decrease in the defect PL lifetime upon MPc adsorption, and the gate voltage-dependent PL reveals the suppression of the defect emission even at large Fermi level shifts. Density functional theory modeling argues that the MPc complexes stabilize dark negatively charged defects over luminescent neutral defects through an electrostatic local gating effect. These results demonstrate the control of defect-based excited-state decay pathways via molecular electronic structure tuning, which has broad implications for the design of mixed-dimensional optoelectronic devices.
Databáze: MEDLINE
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