Boost the performance of inverted perovskite solar cells with PEDOT:PSS/Graphene quantum dots composite hole transporting layer

The inverted p-i-n structure perovskite solar cells show great potential in wearable devices and flexible solar cells. Yet the commonly used PEDOT:PSS hole transporting layer still needs to be optimized in order to pursue superior performances. Here, we have demonstrated that PEDOT:PSS/GQDs composite film can be a potential alternative to replace the PEDOT:PSS. Under optimized conditions, average power conversion efficiencies are boosted from 12.77% for perovskite solar cells fabricated on PEDOT:PSS film to 15.24% for perovskite solar cells fabricated on PEDOT:PSS/GQDs film. A champion power conversion efficiency of 16.15% has also been demonstrated with the optimized PEDOT:PSS/GQDs composite film.