Our work on mutually-diluted heterojunctions for efficient OSCs is accepted in Nature Energy

      As an excitonic photovoltaic device, the photoactive layer of organic solar cells consists of p-type electron donors and n-type electron accepotors, which phase separate to form fine and continuous networks for charge transport upon carrier generation at their interfaces. However, how the donor-acceptor interaction will affect the microstructure and optoelectronic properties of OSCs remains unclarified.

In this contribution, we found via diluting the polymer donor with non-fullerene acceptor (1wt.%) , or vice versa, can increase their structural orders via dipole-dipole interactions, resulting in increased light absorption and charge mobilities. When further applied these structurally-modified semiconductors into pseudo-bilayer heterojunction OSCs, enhanced photovoltaic performance were observed in a range of polymer:non-fullerene systems, with a champion PCE of 19.4% (certified 19.1%) and FF of 81.8% recevied in PM6+1%L8-BO/L8-BO+1%PM6 device.