Efficient Hole Transfer via CsPbBr3 Quantum Dots Doping toward High‐Performance Organic Solar Cells

Abstract

Among the emerging photovoltaic technologies, organic and perovskite quantum dots (PQDs) solar cells have thrived on low‐cost processing and extraordinary optoelectronic properties. Herein, CsPbBr3 PQDs are incorporated into PM6:Y6‐BO organic solar cell (OSC) to enhance device efficiency without scarifying the device stability. While the incorporation of PQDs has no impact on the molecular packing and phase separation of organic semiconductors, their presence enhances light absorption due to the Rayleigh scattering effect, promotes exciton dissociation in the Y6‐BO phase, and forms an efficient hole transfer pathway from Y6‐BO to PQDs and then to PM6 to improve hole transport. These contribute to increased short‐circuit current density (JSC) and fill factor (FF) of OSCs with constant VOC. With the presence of 1 wt% CsPbBr3 PQDs doping, the highest power conversion efficiency (PCE) of the corresponding PM6:Y6‐BO OSC is improved from 16.4% to 17.1%, where the device stability has not been affected due to the better phase stability of CsPbBr3 PQDs than CsPbI3 PQDs. This work unravels a new approach to enhance the efficiency of OSCs by applying PQDs doping to manipulate the photon‐to‐electricity conversion process.