Fig. 20.

Chalcogen substituting iodine in the synthesis of TMCs. a Schematic of the substitution and atomic structure of CdS flakes on mica substrate by chemical sulfurization method. b Representative optical microscope images of converted CdI₂ thin flake on mica substrates. c Representative optical images of original large-scale CdI₂ thin flake and converted CdS thin flake on mica substrates, respectively. d HRTEM image of converted CdS flakes. The inset is the selected area electron diffraction pattern taken along the direction [001] of CdS flakes. Reproduced with permission [35].

Copyright 2021, Springer Nature. e Schematic showing the preparation of CdS flakes on mica substrate by chemical sulfurization method. f The thickness of CdI₂ and SnI₂ flakes after being converted to CdS and SnS₂. Reproduced with permission [34]. Copyright 2023, Springer Nature