General Strategy for the Growth of CsPbX₃ (X = Cl, Br, I) Perovskite Nanosheets from the Assembly of Nanorods

Abstract

Shape control is critical and offers an efficient way to tune the properties of nanocrystals (NCs). Here we present the growth of two-dimensional (2-D) all-inorganic CsPbX3 (X = Cl, Br, I) perovskite NCs through the assembly of corresponding 1-D nanorods (NRs) under solvothermal conditions. Both 2-D CsPbX3 perovskite nanoplatelets (NPLs) and nanosheets (NSs) with a wide lateral size range from ∼100 nm to ∼1 μm and thickness of a few unit cells can be obtained by the control of the solvothermal reaction time. The present work provides a general strategy for rational fabrication of 2-D CsPbX3 (X = Cl, Br, I) perovskite NCs without the assistance of anion exchange. The obtained fluorescent 2-D all-inorganic perovskite NCs have great potential in practical photovoltaic applications.

Ultrathin, Core–Shell Structured SiO2 Coated Mn2+‐Doped Perovskite Quantum Dots for Bright White Light‐Emitting Diodes

“…Figure b depicts the X‐ray diffraction (XRD) patterns of CsPbMnX 3 and core–shell CsPbMnX 3 @SiO 2 QDs, and both of the two samples belong to the same orthorhombic CsPbX 3 phase (JCPDS 54–0752), verifying the silica layer has almost no impact on the crystallinity of perovskite. In addition, the peak intensity ratio of (200) at 32° and (110) at 23.1° changes from ≈1.07 in CsPbMnX 3 QDs to 1.53 for CsPbMnX 3 @SiO 2 QDs, and the slight increased relative peak intensity of (200) diffraction for CsPbMnX 3 @SiO 2 QDs suggests the growth of the QDs along the (200) plane . It should be noted that in the presented work the solution processing method can be recognized as one of the most efficient approaches to prepare CsPbMnX 3 @SiO 2 core–shell QDs.…”

Optoelectronic Perovskite Synapses for Neuromorphic Computing

“…Today, all‐inorganic perovskite materials are widely used in photovoltaic devices, such as solar cells, photodetectors, and light‐emitting diodes. All‐inorganic perovskite materials with different morphologies have their own advantages in application, and nanoplates have excellent light absorption coefficients, good electrical transmission capacities, and high environmental stabilities; thus, these materials hold potential for preparing optoelectronic synapses in the future.…”

CsPbI3 Nanotube Photodetectors with High Detectivity

“…To date, 1D nanomaterials of CsPbI 3 are prepared typically through hot‐injection, room‐temperature reprecipitation, solvothermal, anion exchange, microwave strategy, vapor deposition, and so on. In terms of the morphology‐dependent performance, 1D CsPbI 3 nanomaterials have been grown in various morphologies, including nanowires, and nanorods . The conductive channel of 1D CsPbI 3 nanostructured materials could confine the active area of charge carriers and shorten the carrier transit time, making them be advantageous for exploring high‐performance PDs .…”