Using steric hindrance to manipulate and stabilize metal halide perovskites for optoelectronics

Abstract

Manipulation on steric hindrance can influence the fundamental kinetics of perovskite crystallization and film formation, therefore stabilizing and passivating perovskite structures, and promoting the commercialization of stable perovskite devices.

A Selective Targeting Anchor Strategy Affords Efficient and Stable Ideal‐Bandgap Perovskite Solar Cells

“…Therefore, we proposed, besides electrostatic effect, steric hindrance could also take responsibility for such selectivity. [ 69 ] When the deficient amount of Sn doped, the reactive sites of [SnI 6 ] 4− octahedral could be partially shadowed by major bulky [PbI 6 ] 4– octahedral. Compared with EDAI with a linear structure, PEAI with a large ring configuration is difficult to reach the reactive sites of [SnI 6 ] 4− octahedral where E Surf + EDAI/PEAI is the total energy of surface systems with an EDAI or PEAI, E Surf is the total energy of the clean surface system, and E EDAI/PEAI is the total energy of the EDAI or PEAI.…”

“…Therefore, we proposed, besides electrostatic effect, steric hindrance could also take responsibility for such selectivity. [69] When the deficient amount of Sn doped, the reactive sites of [SnI 6 ] 4− octahedral could be partially shadowed by major bulky [PbI 6 ] 4octahedral. Compared with EDAI with a linear structure, PEAI with a large ring configuration is difficult to reach the reactive sites of [SnI 6 ] 4− octahedral…”

In-Situ Implant Formulation of Laurate and Myristate Prodrugs of Dolutegravir for Ultra-Long Delivery

“…An increase in bulkiness is accompanied by hindrance in the arrangement of the molecules in a crystal lattice that resulted in decrease in compactness and lower crystallinity. 36,37,38 Furthermore, negative correlation of -0.93 was obtained between length of alkyl group of fatty acid and melting point of the prodrugs. Thus, formation of prodrugs of DTG resulted in lowering of melting point of the DTG.…”

Organic Matrix Assisted Low‐temperature Crystallization of Black Phase Inorganic Perovskites

“…As the degree of PbI 6 distortion can profoundly affect the transition between the different phases, [29] controlling the distortion by introducing steric hindrance or other external factors can help to retain CsPbI 3 in the desired black phases. [39] As regards the temperature dependence of the four phases of CsPbI 3 ,t he room-temperature-stable yellow dphase CsPbI 3 can convert into the black a-phase when heated above 360 8 8C. [30] During the cooling step,C sPbI 3 adopts aphase transition pathway where the b-phase CsPbI 3 forms at 260 8 8C, [28] and the g-phase CsPbI 3 forms at 175 8 8C.…”