Persistent p-type group II-IV semiconductors
View Patent ↗A persistent p-type group II-VI semiconductor material is disclosed containing atoms of group II elements, atoms of group VI elements, and a p-type dopant which replaces atoms of the group VI element in the semiconductor material. The p-type dopant has a negative oxidation state. The p-type dopant causes formation of vacancies of atoms of the group II element in the semiconductor material. Fabrication methods and solid state devices containing the group II-VI semiconductor material are disclosed.
1. A persistent p-type group II-VI semiconductor material comprising a thin film of a single crystal group II-VI semiconductor comprising atoms of group II elements and atoms of group VI elements, wherein the group II-VI semiconductor is doped with a p-type dopant to form one or more ternary compounds:, and wherein the single crystal group II-VI semiconductor has a crystal lattice comprising vacancies of atoms of the group II elements, wherein the p-type dopant replaces atoms of the group VI elements in the semiconductor material under conditions which inhibit formation of chemical bonds between atoms of group VI elements and the p-type dopant and inhibit the formation of volatile reaction products of the group VI elements and the p-type dopant, wherein the group II-VI semiconductor is doped with a p-type dopant at a temperature below about 450° C.
2. A persistent p-type group II-VI semiconductor material according to claim 1 , wherein the p-type dopant has a negative oxidation state.
3. A persistent p-type group II-VI semiconductor material according to claim 1 , wherein the group II elements are selected from zinc, cadmium, alkaline earth metals, and mixtures thereof.
4. A persistent p-type group II-VI semiconductor material according to claim 1 , wherein the group VI elements are selected from oxygen, sulfur, selenium, tellurium, and mixtures thereof.
5. A persistent p-type group II-VI semiconductor material according to claim 1 , wherein the p-type dopant is selected from nitrogen, phosphorus, arsenic, antimony, bismuth, chalcogenides of the foregoing, and mixtures thereof.
6. A persistent p-type group II-VI semiconductor material according to claim 1 , wherein the group II-VI semiconductor material is zinc oxide.
7. A persistent p-type group II-VI semiconductor material according to claim 1 , wherein the group II-VI semiconductor material is zinc sulfide.
8. A persistent p-type group II-VI semiconductor material according to claim 1 , wherein the group II-VI semiconductor material is in a single crystal form having a resistivity less than about 0.5 ohm·cm and a carrier mobility greater than about 0.1 cm 2 /V·s.
9. A persistent p-type group II-VI semiconductor material according to claim 1 , wherein the resistivity is less than about 0.1 ohm·cm.
10. A persistent p-type group II-VI semiconductor material according to claim 1 , wherein the resistivity is less than about 0.01 ohm·cm.
11. A persistent p-type group II-VI semiconductor material according to claim 1 , wherein the resistivity is less than about 0.001 ohm·cm.
12. A persistent p-type group II-VI semiconductor material according to claim 1 , wherein the carrier mobility is greater than 0.5 cm 2 /V·s.
13. A persistent p-type group II-VI semiconductor material according to claim 1 , wherein the carrier mobility is greater than 4 cm 2 /V·s.
14. A persistent p-type group II-VI semiconductor material according to claim 1 , wherein the p-type dopant concentration is in the range from about 10 16 to 10 21 atoms/cm 3 .
15. A persistent p-type group II-VI semiconductor material according to claim 1 , wherein the p-type dopant concentration is in the range from about 10 17 to 10 19 atoms/cm −3 .
16. A persistent p-type group II-VI semiconductor material according to claim 1 , wherein the semiconductor material is embodied with a solid state device selected from light emitting diodes, laser diodes, field effect transistors, photodetectors, electrochromic devices, flat-panel display devices, and radiation hardened electrical components.
17. A persistent p-type group II-VI semiconductor material according to claim 1 , further comprising magnesium oxide.
18. A persistent p-type group II-VI semiconductor material according to claim 1 , further comprises cadmium oxide.
19. A persistent p-type group II-VI semiconductor material according to claim 1 , wherein vacancies of atoms of the group II elements exist because atoms of the p-type dopant replace a greater number of group VI atoms in the ternary compound.
20. A persistent p-type group II-VI semiconductor material according to claim 1 , the oxidation state of the p-type dopant of the ternary compound.