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1. Polymorphism in metal halide perovskites

   https://doi.org/10.1039/D0MA00643B  

   Alaei, Aida; Circelli, Abigail; Yuan, Yihang; Yang, Yi; Lee, Stephanie S. (January 2021, Materials Advances)

   null (Ed.)

   Metal halide perovskites (MHPs) are frontrunners among solution-processable materials for lightweight, large-area and flexible optoelectronics. These materials, with the general chemical formula AMX 3 , are structurally complex, undergoing multiple polymorph transitions as a function of temperature and pressure. In this review, we provide a detailed overview of polymorphism in three-dimensional MHPs as a function of composition, with A = Cs + , MA + , or FA + , M = Pb 2+ or Sn 2+ , and X = Cl − , Br − , or I − . In general, perovskites adopt a highly symmetric cubic structure at elevated temperatures. With decreasing temperatures, the corner-sharing MX 6 octahedra tilt with respect to one another, resulting in multiple polymorph transitions to lower-symmetry tetragonal and orthorhombic structures. The temperatures at which these phase transitions occur can be tuned via different strategies, including crystal size reduction, confinement in scaffolds and (de-)pressurization. As discussed in the final section of this review, these solid-state phase transformations can significantly affect optoelectronic properties. Understanding factors governing these transitions is thus critical to the development of high-performance, stable devices. 

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2. Laser printed metal halide perovskites

   https://doi.org/10.1088/2515-7639/ab9aac  

   Tyznik, Colin; Lamport, Zachary A; Sorli, Jeni; Becker-Koch, David; Vaynzof, Yana; Loo, Yueh-Lin; Jurchescu, Oana D (July 2020, Journal of Physics: Materials)
3. Metal Halide Perovskites for Laser Applications

   https://doi.org/10.1002/adfm.202010144  

   Lei, Lei; Dong, Qi; Gundogdu, Kenan; So, Franky (April 2021, Advanced Functional Materials)
4. Distinguishing metal halide molecular clusters from perovskite magic sized clusters in the synthesis of metal halide perovskite nanostructures

   https://doi.org/10.1002/jccs.202300195  

   Zeitz, David C.; Win, Allison A.; Zhang, Jin Z. (April 2023, Journal of the Chinese Chemical Society)
5. Bulk assembly of organic metal halide nanotubes

   https://doi.org/10.1039/c7sc03675b  

   Lin, Haoran; Zhou, Chenkun; Tian, Yu; Besara, Tiglet; Neu, Jennifer; Siegrist, Theo; Zhou, Yan; Bullock, James; Schanze, Kirk S.; Ming, Wenmei; et al (January 2017, Chemical Science)

   The organic metal halide hybrids welcome a new member with a one-dimensional (1D) tubular structure. Herein we report the synthesis and characterization of a single crystalline bulk assembly of organic metal halide nanotubes, (C 6 H 13 N 4 ) 3 Pb 2 Br 7 . In a metal halide nanotube, six face-sharing metal halide dimers (Pb 2 Br 9 5− ) connect at the corners to form rings that extend in one dimension, of which the inside and outside surfaces are coated with protonated hexamethylenetetramine (HMTA) cations (C 6 H 13 N 4 + ). This unique 1D tubular structure possesses highly localized electronic states with strong quantum confinement, resulting in the formation of self-trapped excitons that give strongly Stokes shifted broadband yellowish-white emission with a photoluminescence quantum efficiency (PLQE) of ∼7%. Having realized single crystalline bulk assemblies of two-dimensional (2D) wells, 1D wires, and now 1D tubes using organic metal halide hybrids, our work significantly advances the research on bulk assemblies of quantum-confined materials. 

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