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We discussed structural and electrical properties of PbS films deposited by chemical bath deposition. The crystallite size of our films measured by transmission electron microscope was as large as 0.2 μm in a lateral direction and 1 μm in a vertical direction, and we obtained a high mobility value of 60 cm 2 V −1 s −1 at room temperature. We also demonstrated PbS photovoltaic infrared detectors using silver nanowires as transparent electrodes, whose spectral response was measured by Fourier transform infrared spectrometer. The cut-off wavelength was ∼3 μm at room temperature and ∼4 μm at 10 K. At 100 K, a pronounced photocurrent peak was observed at λ=3.7 μm. Using finite difference time domain simulations, we demonstrated that silver nanowires worked as nano antennas for generating surface plasmons, resulting in the enhancement of photocurrent. The pronounced photocurrent peak wavelength corresponds to the wavelength where the silver nanowires were located near the constructive interference.

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Over the past decades, graphene has attracted much attention from the scientific community due to its broad applications in the optoelectronics industries [1] . Owing to graphene's high transmission and high electrical conductivity, diverse functional materials/graphene hybridized heterostructures and interfaces are under extensive investigation to satisfy the increasing interest in the need for bendable, flexible and high performance optoelectronic devices [2] . Due to the good atomic lattice structure of graphene, varying heterostructures have been formed by depositing different functional materials directly on graphene [3] , [4] , [5] . We fabricated a vertical photovoltaic type G/PbS/Ti device by making use of the Ti/PbS Schottky junction and discussed the photocurrent transient characteristics. Lead sulfide (PbS) was deposited directly on large area CVD (Chemical vapor deposition) graphene by CBD (Chemical bath deposition). Temperature dependent photocurrent spectra of our G/PbS/Ti photovoltaic devices were measured by a Fourier transformed infrared (FTIR) set-up. In this paper, we present the experimental procedures and the raw experimental data for the direct chemical deposition of PbS on CVD-graphene for high performance photovoltaic infrared photo-detectors. The manuscript is already available [6] .