A leap towards high performance quantum dot solar cells

• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2020,（10）
• 页码范围: 783-785
• 页数: 3页
• 语种: 英文

摘要

Lead halide perovskites in the form of nanocrystalline quantum dots (QDs) have emerged as a new class of semiconductor materials for photovoltaics (PVs) and optoelectronics.Thanks to the nanoscale size-induced lattice strain and enhanced contribution from the surface energy [1], perovskite QDs have shown superior phase stability at room temperature over their thin film bulk counterparts offering a promising strategy to significantly increase stability and hence lifetime of the perovskite devices.Other notable advantages including wider compositional tunability, smaller voltage loss and unprecedented device architectures make perovskite QDs a promising candidate for developing QD-based tandems and tandems with other perovskites or silicon [2,3].In addition,perovskite QDs allow easier scale-up and more rapid manufacturing by decoupling grain-crystallization from film-deposition.When incorporated in PV devices, cesium and formamidinium lead triiodide (CsPbl3 and FAPbl3) QDs have yielded promising power conversion efficiencies (PCEs) with a previous record of 13.4％ [2],outperforming traditional chalcogenide QD solar cells (QDSCs).Nevertheless, the susceptible nature of CsPbl3 and FAPbI3 QDs towards moisture and polar solvents [1,4] makes it difficult to further increase the PCEs.The mixed-cation Cs1-xFAxPbl3 QDs with entropically stabilized perovskite structure were then explored ,but the reported multinary QDs suffer from low optoelectronic quality resulting in even deteriorated efficiency [5] and perovskite QDSCs still lag far behind those of the state-of-the-art thin film devices in PCE.