In Situ Synergistic Ti2CTx/W18O49 Heterostructure for Photoelectrochemical Photodetector with Improved and Durable Photoresponse

Ti2CTx is a typical 2D layered semiconductor material with a high carrier mobility and intriguing photodetector performance. In this work, a Ti2CTx/W18O49 heterostructure was fabricated via a simple one-pot hydrothermal method. The photoelectrochemical (PEC)-type photodetector was constructed by using the as-prepared composite as the electrode material. The Ti2CTx/W18O49 heterostructure clearly exhibited a significant increase in photoresponse compared to that of solitary Ti2CTx and W18O49, as shown by the results of the PEC tests. This demonstrates how the Ti2CTx and W18O49 interface effectively generates and transfers photocarriers, which can enhance the photoresponse performance. Additionally, the constructed Ti2CTx/W18O49 heterostructure-based photodetector's photocurrent density can practically linearly increase as the irradiation power density rises. The photocurrent density and photoresponsivity can reach 1.42 μA/cm2 and 19.6 μA/W at 0.6 V, respectively. The prepared Ti2CTx/W18O49 heterostructure-based photodetector also shows excellent cycle stability; after more than 2500 s and 125 on/off cycles, the photocurrent shows no obvious attenuation. The superb PEC-type photodetector performance of a Ti2CTx/W18O49 heterostructure holds much promise for photodetection.