During operations of photovoltaic cells,the thermal efficiency(i.e.,the ratio of the output power to the impinging solar radiation)is known to decrease as the photovoltaic film temperature undesirably
Graphene,since successfully isolated in 2004 [1],has been evoking a worldwide research on two-dimensional(2D)single-layer systems.As the first one-atom thickness two-dimensional material,it has many n