Excited state charge transfer in covalently functionalized MoS2 with zinc phthalocyanine donor‐acceptor hybrid

Functionalization of MoS2 is of paramount importance tailoring its properties towards optoelectronic applications and unlocking its full potential. Zinc phthalocyanine (ZnPc) carrying an 1,2‐dithiolane oxide linker was employed to functionalize MoS2 at defected 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, to visualize different photochemical events in ZnPc‐MoS2 was established and revealed bi‐directional electron transfer leading to ZnPc•+‐MoS2•– charge separated state. Markedly, evidence of charge transfer in the hybrid was demonstrated using fluorescence spectroelectrochemistry. Systematic studies performed by femtosecond transient absorption revealed involvement of excitons generated in MoS2 in promoting charge transfer, while such charge transfer was also possible when ZnPc was excited, signifying their potentiality in light energy harvesting devices.

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