Table 1.
Summary of typical 2D GIVMCs and their properties. (Ind.: indirect; dir.: direct)
| GIVMCs | Crystal structures | Lattice parameters[Å] | Distance[nm] | Electronic properties | Bulk bandgaps[eV] | References |
|---|---|---|---|---|---|---|
| GeS | Orthorhombic | a = 4.3 | 0.56 | p‐type | ind./dir. 1.55–1.65 | 91, 92 |
| b = 10.47 | ||||||
| c = 3.64 | ||||||
| GeS2 | Orthorhombic | a = 11.74 | – | p‐type | dir. 2.8–3.4 | 111, 260 |
| b = 22.47 | ||||||
| c = 6.88 | ||||||
| GeSe | Orthorhombic | a = 10.84 | – | p‐type | ind./dir. 1.1–1.2 | 93, 94 |
| b = 3.83 | ||||||
| c = 4.39 | ||||||
| GeSe2 | Monoclinic | a = 7.01 | – | p‐type | 2.8 | 113 |
| b = 16.79 | ||||||
| c = 11.83 | ||||||
| SnS | Orthorhombic | a = 4.33 | 0.56 | p‐type | ind. 1.07 | 79 |
| b = 11.19 | dir. 1.3 | |||||
| c = 3.98 | ||||||
| SnS2 | Hexagonal | a = b = 10.47 | 0.62 | n‐type | ind. 2.2 | 72 |
| c = 5.89 | ||||||
| SnSe | Orthorhombic | a = 11.49 | 0.57 | p‐type | ind. 0.9 | 105 |
| b = 4.15 | dir. 1.3 | |||||
| c = 4.44 | ||||||
| SnSe2 | Hexagonal | a = b = 3.81 | 0.62 | n‐type | 1.0 | 120 |
| c = 6.14 |