Based on the enhancement conditions of optical heating and an electrical junction, graphene photodetectors can be categorized into four cases, each represented by a row. In all plots, the horizontal axes denote the spatial coordinate x, and the vertical axes are denoted by their respective column headers. The T(x) column illustrates the electron temperature profile owing to laser illumination, and the dT/dx column is obtained by taking the spatial derivative of T(x). s(x) represents the spatial distribution of the Seebeck coefficient, and the s(x)∙(dT/dx) column is obtained by taking the product of the s(x) and dT/dx columns. The PTE current is calculated by integrating the s(x)∙(dT/dx) function, i.e., adding the areas of the shaded regions, with red (blue) denoting the positive (negative) contribution to the PTE current
展开▼
