In recent years, CuInSe_2 thin film solar cells are took much attention with its higher conversion efficiency, lower costs and much more stable performance. As its production process moving towards commercialization, a key for researching is how to improve efficiency of photovoltaic conversion of battery, and the absorption layer material CIS is the key factor which affects battery photoelectric conversion efficiency. Study shows that: the CuInSe_2 band gap (Eg) can be increased to match the solar s...