Efficient Semitransparent CsPbI3 Quantum Dots Photovoltaics Using a Graphene Electrode

Abstract Solution‐processed perovskite quantum dots (QDs) are promising candidates for fabrication of semitransparent and tandem solar cells due to the bandgap tunability. In this work, cesium lead triiodide (CsPbI 3 ) QDs are synthesized with a stable cubic phase and efficient perovskite solar cells (PSCs) are fabricated using the ligand exchange technique. Monolayer graphene is grown by chemical vapor deposition technique and a dry process to transfer graphene on top of the device is developed. Based on this approach, an efficient inverted PSC is demonstrated with a high average visible transmittance (AVT). After optimization, PSCs based on silver and graphene electrodes with power conversion efficiencies (PCEs) of 9.6% and 6.8% are achieved, respectively. Additionally, by tuning the thickness of the active layer, a PSC with PCE of 4.95% and AVT of 53% is demonstrated, indicating the potential of CsPbI 3 QDs for the fabrication of semitransparent devices applicable in windows.