Fabrication of P-N heterojunction based MoS2 modified CuPc nanoflowers for humidity sensing

Abstract In recent times, there has been an increased demand for cost-effective, robust and highly reliable humidity sensors. 2D material MoS2 (n-type) have demonstrated their potential application in chemical and humidity sensing. In this work, an organic-inorganic p-n heterojunction based sensor has been fabricated using the inorganic MoS2 and the organic CuPc, and its viability towards humidity sensing has been experimentally demonstrated. The thin film sensor was characterized by SEM and the results revealed the formation of CuPc nanoflowers on MoS2 surface. The XRD results also indicate excellent crystallization. The sensor shows reduced resistance with increasing RH% and the variation has been observed to be almost linear. The sensing range is from 20% RH to 98% RH. The measured sensitivity is 0.615 MΩ/%RH. The demonstrated results are of great interest in terms of sensitivity, linear response, range of humidity monitoring and stability.