Details

Autor(en) / Beteiligte

• Luo, Binbin
• Pu, Ying-Chih
• Lindley, Sarah A.
• Yang, Yi
• Lu, Liqiang
• Li, Yat
• Li, Xueming
• Zhang, Jin Z.

Titel

Organolead Halide Perovskite Nanocrystals: Branched Capping Ligands Control Crystal Size and Stability

Ist Teil von

• Angewandte Chemie (International ed.), 2016-07, Vol.55 (31), p.8864-8868

Auflage

International ed. in English

Ort / Verlag

Germany: Blackwell Publishing Ltd

Erscheinungsjahr

2016

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• CH3NH3PbBr3 perovskite nanocrystals (PNCs) of different sizes (ca. 2.5–100 nm) with high photoluminescence (PL) quantum yield (QY; ca. 15–55 %) and product yield have been synthesized using the branched molecules, APTES and NH2‐POSS, as capping ligands. These ligands are sterically hindered, resulting in a uniform size of PNCs. The different capping effects resulting from branched versus straight‐chain capping ligands were compared and a possible mechanism proposed to explain the dissolution–precipitation process, which affects the growth and aggregation of PNCs, and thereby their overall stability. Unlike conventional PNCs capped with straight‐chain ligands, APTES‐capped PNCs show high stability in protic solvents as a result of the strong steric hindrance and propensity for hydrolysis of APTES, which prevent such molecules from reaching and reacting with the core of PNCs. Perovskite nanocrystals: Variously sized perovskite nanocrystals (PNCs) with high photoluminescence quantum yield and uniformity have been synthesized using branched ligands (APTES). APTES‐capped PNCs show high stability in protic solvents because the steric and hydrolysis properties of APTES prevent protic reactions with the core of PNCs.