Progress in the blend stacked structure of organic solar cells

Organic solar cells have received extensive attention due to their light weight, low cost, flexible. Because a single organic material absorbs only part of the sun light, laminated structure of solar cell, consisting of different absorption band gaps of organic material through the middle connecting layer, can both cover a larger part of the solar flux, and improve the circuit voltage or short circuit current of the solar cells. In this paper, the recent progress of the blend laminated structure polymer solar cells is summarized. Structures, principles and performances of a variety of laminated organic solar cells are introduced. The present status of research and existing problems of the blend laminated structure polymer solar cells are described, which provides valuable referesce for the study of high-performance organic solar cells.