Plasmon induced ambipolar photoresponse in Au decorated MoS2/PEDOT:PSS nanocomposite films

Abstract

Here, a photodetector based on Au decorated MoS2/poly(3,4-ethylenedioxythiophene) poly(4-styrenesulfonate) PEDOT:PSS nanocomposite films (NCFs) were prepared and their ambipolar (negative and positive) photoresponse under UVC (220–300 nm) and UVA (320–400 nm) UV illumination by increasing the Au decoration on MoS2 in NCFs was reported. This unusual phenomenon relates to the confinement and trapping of charges induced by radiation and plasmons. The hydrothermal technique is employed for generating MoS2 nanosheets. Optical studies reveal the observable bandgap difference resulting from the addition of increasing Au decoration on MoS2 in NCFs. Fourier transform infrared spectroscopy investigations are conducted to comprehend the vibrational characteristics of the produced samples. Carrier localization and trapping generated by photoexcitation and plasmon-induced ambipolar photoresponses provide a versatile control parameter. These results provide opportunities for the application of NCF material in electrical, optical, and optoelectronic devices. The results of this work broaden the pool of potential materials for UVC and UVA photodetectors, perhaps providing new perspectives on the photoresponse of the NCF.