High light utilization of multi-terminal tandem device based on semitransparent organic solar cells

A semitransparent organic solar cells (STOSCs) based on the PTB7-TH:PC 71 BM blended were obtained. The power conversion efficiency (PCE) and an average visible light transmission rate achieved 5.06% and 47.95%, respectively. For sufficiently absorption of the sunlight, the multi-terminal tandem solar cells (TSCs) were constructed. Three different structures of TSCs are constructed to adequately absorb the sunlight. One of them is the superposition of five same STOSCs, the PCE of TSCs obtains 10.83%. One is STOSCs as the top cell and the normal organic solar cells as the bottom cell; the PCE of TSCs obtains 9.90%. And the other one is STOSCs as the top cell and inorganic Cu 2 ZnSn(S,Se) 4 as the bottom cell; the PCE of TSCs obtains 11.29%, and the absorption wavelength range extends to 1200 nm with the antireflection film.