Integrated Strategies for Efficient Charge Transport Perovskite Solar Cells with multi-Functional Polymer
발표자
()
초록
내용
Passivation engineering is a major key to obtaining high power conversion efficiency (PCE) and long-term stability for perovskite solar cells (PSCs). Previous studies approached the active layer or charge transport layer with individual engineering and other materials. In this study, we introduce polymer to modify not only perovskite’s grain boundaries but also spiro-OMeTAD. Passivation polymer restores the defect site on the grain boundaries to achieve higher open-circuit voltage (Voc) and fill factor (FF). Also, the same passivation polymer introduces spiro-OMeTAD to suppress pinhole and crystallization. This multi-functional polymer provides additional Voc and FF improvement and obtains long-term stability. The optimum structure of perovskite solar cells (PSCs) achieves a PCE of 23.9%, which is the first report surface energy analysis between perovskite and spiro-OMeTAD. The non-encapsulated PSCs sustain 80% after 2500 h at 30 ℃ under 30% RH conditions.