NOVELTY - Thin film solar cell (600) comprises: a substrate (610); a first electrode layer (620), disposed on the substrate; a first photovoltaic layer (630), disposed on the first electrode layer; a second photovoltaic layer (640), disposed on the first photovoltaic layer; an interlayer, disposed between the first and the second photovoltaic layer, so as to reduce an inter-diffusion effect generated between the first and the second photovoltaic layer; and a second electrode layer, disposed on the second photovoltaic layer.    USE - Used as thin film solar cell.    ADVANTAGE - The thin film solar cell: has a crystallization layer between the photovoltaic layer and the conductive layer or between the adjacent photovoltaic layers, so that the dangling bonds on the contact surface between film layers are reduced, possibility of the surface recombination of electron-hole pairs on the contact surface between film layers is decreased, and the photoelectric characteristics (e.g. photoelectric conversion efficiency) of the thin film solar cell is improved; has the interlayer between stacks of different photovoltaic layers, which reduces the inter-diffusion effect between stacks, thus enhances the manufacturing yield and whole photoelectric conversion efficiency of the stacks, and reduces the production cost; and has higher light utilization rate.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for manufacturing a thin film solar cell, comprising: providing a substrate; forming a first electrode layer on the substrate; forming a first photovoltaic layer on the first electrode layer; forming a second photovoltaic layer on the first photovoltaic layer; forming an interlayer between the first photovoltaic layer and the second photovoltaic layer, where a material of the interlayer is an intrinsic semiconductor or a metal oxide semiconductor; and forming a second electrode layer on the second photovoltaic layer.    DESCRIPTION OF DRAWING(S) - The figure shows the structure of the thin film solar cell.    Thin film solar cell (600)    substrate (610)    First electrode layer (620)    First photovoltaic layer (630)    Second voltaic layer (640)