However, the efficiency of this tool is considerably lower, and typical band gaps of 1.9–1.95 eV were reported. It was shown that such interactions contribute to narrowing the band gap, even in the case of 0D anionic substructure. The second tool is the use of multiple weak interactions, such as hydrogen bonds and secondary X H 2O with one-dimensional anions of different compositions and structures provide examples of band gaps of 1.70–1.75 eV.When the octahedra condense into 1D or 2D arrays, the band gap narrows. This is observed for various compounds based on MX 6 3− anions (M = Sb, Bi X = Cl, Br, I). As a rule, the band gap is wide when 0D anions form the anionic substructure of halometallates. īasically, there are three tools for narrowing the band gap. Literature shows that these two cations form a variety of compounds with halogens, demonstrating diverse crystal structures. The choice of other cations with s 2 lone pairs is limited to Sb3+ and Bi3+, both being not toxic and showing properties favorable for light harvesting. Moreover, tin compounds are also toxic, albeit less than those of lead. Tin in the +2 oxidation state is not stable in halogenides due to its propensity to be oxidized in air and to be disproportionate in an inert atmosphere. An obvious scenario of choosing tin instead of lead did not lead to success. For this reason, other halometallates are now receiving more attention in striving to find non-toxic materials to replace hazardous lead compounds. However, toxicity of lead derivatives raises concerns about potential applications of materials based on haloplumbates. The discovery of superior light-harvesting properties of inorganic and hybrid haloplumbates that enabled a 25% photovoltaic efficiency of solar cells have triggered great interest in these compounds and led to their meticulous investigation.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |