Beyond Colloidal Cesium Lead Halide Perovskite Nanocrystals: Analogous Metal Halides and Doping

High Resolution Image Download MS PowerPoint Slide Colloidal CsPbX 3 (X = Cl, Br, I) nanocrystals (NCs) are being explored extensively as an interesting variety of defect-tolerant materials, wherein high efficiencies of optical and optoelectronic processes can be achieved even in the presence of surface defects. This defect-tolerant nature arises mainly because of the unique electronic band structure of these perovskites. Consequently, synthesis and exploration of other metal halide {CsSnX 3, Cs 2 SnX 6, and (CH 3 ) 3 Bi 2 X 9 } NCs with electronic band structure similar to that of CsPbX 3 perovskite have begun with high promise. Another initiative to tailor the properties is the doping of metal ions (Mn 2+, Zn 2+, Cd 2+, Sn 2+, and Bi 3+ ) into the lattice of CsPbX 3 NCs. Furthermore, nanocomposites of CsPbX 3 –metal and CsPbX 3 –dielectric layer–metal have been attempted. Here we discuss the recent progress in the research of these colloidal metal halide NCs that are either analogous to CsPbX 3 perovskites or derivatives of CsPbX 3 perovskites.