Rational molecular and device design enables organic solar cells approaching 20% efficiency

Rational molecular and device design enables organic solar cells approaching 20% efficiency For organic solar cells to be competitive, the light-absorbing molecules should simultaneously satisfy multiple key requirements, including weak-absorption charge transfer state, high dielectric constant, suitable surface energy, proper crystallinity, etc. However, the systematic design rule in molecules to achieve the abovementioned goals is rarely studied. In this work, guided by theoretical calculatio...