Interfacial Engineering of Lead Sulfide Colloidal Quantum Dot Solar Cells for Efficient Charge Extraction
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Colloidal quantum dots (CQDs) have been considered as promising materials for solar cells because of their size-dependent characteristics tunability, solution processability and potential of multiple exciton generation. The architecture of CQD photovoltaics relies on a planar heterojunction consisting of CQD light harvesting layer and charge collection layers, and the band alignment engineering of these layers is crucial for efficient charge collection. Here, we introduce a novel interfacial layer for CQD photovoltaics leading improved charge collection ability and power conversion efficiency.