Excited-State Charge Transfer in Covalently Functionalized MoS2 with a Zinc Phthalocyanine Donor-Acceptor Hybrid

Angewandte Chemie
Ruben Canton-VitoriaNikos Tagmatarchis

Abstract

The functionalization of MoS2 is of paramount importance for tailoring its properties towards optoelectronic applications and unlocking its full potential. Zinc phthalocyanine (ZnPc) carrying an 1,2-dithiolane oxide linker was used to functionalize MoS2 at defect sites located at the edges. The structure of ZnPc-MoS2 was fully assessed by complementary spectroscopic, thermal, and microscopy imaging techniques. An energy-level diagram visualizing different photochemical events in ZnPc-MoS2 was established and revealed a bidirectional electron transfer leading to a charge separated state ZnPc.+ -MoS2.- . Markedly, evidence of the charge transfer in the hybrid material was demonstrated using fluorescence spectroelectrochemistry. Systematic studies performed by femtosecond transient absorption revealed the involvement of excitons generated in MoS2 in promoting the charge transfer, while the transfer was also possible when ZnPc was excited, signifying their potential in light-energy-harvesting devices.

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Citations

Dec 12, 2019·Angewandte Chemie·Ruben Canton-VitoriaNikos Tagmatarchis
Feb 26, 2020·Nanomaterials·Ruben Canton-VitoriaNikos Tagmatarchis
Nov 28, 2019·Chemical Communications : Chem Comm·Valeria Navarro-PérezFrancis D'Souza
Nov 25, 2020·Chemistry : a European Journal·Manuel Vázquez SulleiroEmilio M Pérez

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