Organolead Halide Perovskite Nanocrystals: Branched Capping Ligands Control Crystal Size and Stability.
CH3 NH3 PbBr3 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.
Department of Chemistry and Biochemistry, University of California, Santa Cruz, CA, 95064, USA.|Department of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 400044, China.
Binbin
B
Luo
Department of Materials Science, National University of Tainan, Tainan, 70005, Taiwan, Republic of China.
Ying-Chih
YC
Pu
Department of Chemistry and Biochemistry, University of California, Santa Cruz, CA, 95064, USA.
Sarah A
SA
Lindley
Department of Chemistry and Biochemistry, University of California, Santa Cruz, CA, 95064, USA.
Yi
Y
Yang
Department of Chemistry and Biochemistry, University of California, Santa Cruz, CA, 95064, USA.|Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan, 430074, China.
Liqiang
L
Lu
Department of Chemistry and Biochemistry, University of California, Santa Cruz, CA, 95064, USA.
Yat
Y
Li
Department of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 400044, China. xuemingli@cqu.edu.cn.
Xueming
X
Li
Department of Chemistry and Biochemistry, University of California, Santa Cruz, CA, 95064, USA. zhang@ucsc.edu.
Jin Z
JZ
Zhang
(3-aminopropyl)triethoxysilane (APTES); nanocrystal stability; nanocrystals; organolead halide perovskites; photoluminescence