 Abstract molecular doping is commonly used in organic semiconductors to adjust their optoelectronic properties. Despite its versatility, this technique has been limited to p-type dopants in organic photovoltaics, OPVs. To address this limitation, researchers have developed a new n-type doping method using Benzyl-Viologen, BV, a molecule that can be added to the donor polymer and small molecule acceptor components of an OPV. This combination increases the power conversion efficiency, PCE, of the cell by up to 5%. Additionally, the presence of BV also improves the device's shelf life. Researchers have successfully implemented this technique with five different OPV systems, achieving a maximum PCE of 17.1%. These results demonstrate the potential of this n-type doping approach for enhancing the performance of OPVs. This article was authored by Yuan Baolin, Yulia Ferdows, Muhammad Insan Nugraha and others. We are article.tv, links in the description below.