Distinguishing metal halide molecular clusters from perovskite magic sized clusters in the synthesis of metal halide perovskite nanostructures
Distinguishing metal halide molecular clusters from perovskite magic sized clusters in the synthesis of metal halide perovskite nanostructures
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DOI：
10.1002/jccs.202300195
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发表时间：
2023-06
影响因子：
1.8
通讯作者：
David C Zeitz;Allison A. Win;J. Z. Zhang
中科院分区：
文献类型：
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作者：
David C Zeitz;Allison A. Win;J. Z. Zhang
背景对钙钛矿纳米晶(PNC)的研究发现了与其大块相对应的有趣的性质，包括由于尺寸相关的量子限制效应(QCE)而产生的可调光学性质。最近发现了具有更强QCE的更小的PNC，例如类似于钙钛矿的钙钛矿型魔术尺寸团簇(PMSCs)和配体钝化的PbX2金属卤化物分子团簇(MHMCs)。目的比较PQD、PMSCs和MHMCs的光学和结构性质，其中CsPbBr3PQD的激子吸收约为520 nm，相应的PMSCs的吸收约为420 nm，配体钝化的MHMC的吸收约为400 nm。结果与正常的钙钛矿型量子点(PQD)相比，这些团簇具有更强的光吸收和发射，以及更大的表观体积比(S/V)。由于其较大的S/V比，团簇往往具有更多的表面缺陷，需要更有效的钝化才能稳定。结论最近对新型团簇的研究使人们对其性质有了更好的了解。团簇较清晰的光学带表示相对较窄或单一的尺寸分布，这与它们的蓝色吸收和发射相结合，使它们在蓝单光子发射等领域具有潜在的应用吸引力。
BackgroundResearch into perovskite nanocrystals (PNCs) has uncovered interesting properties compared to their bulk counterparts, including tunable optical properties due to size‐dependent quantum confinement effect (QCE). More recently, smaller PNCs with even stronger QCE have been discovered, such as perovskite magic sized clusters (PMSCs) and ligand passivated PbX2metal halide molecular clusters (MHMCs) analogous to perovskites.ObjectiveThis review aims to present recent data comparing and contrasting the optical and structural properties of PQDs, PMSCs, and MHMCs, where CsPbBr3PQDs have first excitonic absorption around 520 nm, the corresponding PMSCS have absorption around 420 nm, and ligand passivated MHMCs absorb around 400 nm.ResultsCompared to normal perovskite quantum dots (PQDs), these clusters exhibit both a much bluer optical absorption and emission and larger surface‐to‐volume (S/V) ratio. Due to their larger S/V ratio, the clusters tend to have more surface defects that require more effective passivation for stability.ConclusionRecent study of novel clusters has led to better understanding of their properties. The sharper optical bands of clusters indicate relatively narrow or single size distribution, which, in conjunction with their blue absorption and emission, makes them potentially attractive for applications in fields such as blue single photon emission.