Enhancing the Photoresponse of Dilithium Phthalocyanine Crystals Through Nanostructure Design

Abstract

Nanoscale crystal materials have received much attention in the field of photodetection due to their unique physical and chemical properties. In this study, dilithium phthalocyanine nanowires (Li2Pc NWs) were grown by physical vapor deposition (PVD) in the relatively high temperature region. The crystal structure belongs to the P2/n space group, and the diffraction peak positions and crystal parameters are reported for the first time. Photoresponse tests showed that
the Li2Pc NWs displayed stronger variations in photodark currents than the raw materials at both 0.5-10 V bias voltages and 395-850 nm irradiation wavelengths. The photoresponsivity of the Li2Pc NWs was enhanced with increasing voltage, reaching a maximum photoresponsivity of 2.53×10-5 A·W-1 at 10 V and 2.61×10-6 A·W-1 at 455 nm. The unique crystal structure and good photoresponse indicate that Li2Pc NWs have the potential to be applied in the field of photodetection, which provides new possibilities for their development.

Keywords: Dilithium phthalocyanine, Nanowires, New crystal type, Photoresponsivity, Physical vapor deposition