METHOD AND APPARATUS FOR CONTROLLED SEMICONDUCTOR GROWTH DURING SYNTHESIS OF QUANTUM DOT MATERIALS
Techniques and mechanisms for synthesizing quantum dot structures. In an embodiment, a first reaction is performed to dissolve a precursor of a semiconductor material, wherein water is created as a by-product of the first reaction. Some or all of the water is removed and another chemical compound is added, wherein the chemical compound is a primary alcohol or a 1,2-diol. After the addition of the chemical compound, a second reaction is performed to grow at least some nanocrystalline portion of the quantum dot. In another embodiment, the chemical compound is 1,2-hexanediol, 1,2-dodecanediol or 1-octadecanol.
1 . A semiconductor structure, comprising:
a quantum dot including;
a first portion;
a second portion disposed on the first portion, wherein an amount of a residue disposed in or on the second portion is at least 10 parts per million (ppm), wherein the residue is a primary alcohol, a 1,2-diol or a product of a chemical reaction involving the primary alcohol or the 1,2-diol.
2 . The semiconductor structure of claim 1 , wherein any amount of the residue in the first portion is less than the amount of the residue disposed in or on the second portion.
3 . The semiconductor structure of claim 1 , wherein the residue is 1,2-hexanediol.
4 . The semiconductor structure of claim 1 , wherein the residue is 1,2-dodecanediol.
5 . The semiconductor structure of claim 1 , wherein the residue is 1-octadecanol.
6 . The semiconductor structure of claim 1 , wherein the quantum dot comprises a shell including cadmium sulfide (CdS) and a core including cadmium selenide (CdSe).
7 . The semiconductor structure of claim 1 , wherein the quantum dot includes a II-VI semiconductor compound, a III-V semiconductor compound, a IV-IV semiconductor compound or a semiconductor compound.
8 . The semiconductor structure of claim 1 , wherein the quantum dot includes a seed and a shell each including a respective II-VI semiconductor compound.
9 . A method comprising:
performing a first reaction to dissolve a precursor of a semiconductor material, wherein a by-product of the first reaction includes water;
removing the water from a product of the first reaction;
after removing the water, combining a chemical compound with the product of the first reaction, wherein the chemical compound is a primary alcohol or a 1,2-diole including six or more carbon atoms; and
performing a second reaction with the chemical compound and the product of the first reaction to form a portion of a quantum dot.
10 . The method of claim 9 , wherein the chemical compound is 1,2-hexanediol.
11 . The method of claim 9 , wherein the chemical compound is 1,2-dodecanediol.
12 . The method of claim 9 , wherein the chemical compound is 1-octadecanol.
13 . The method of claim 9 , wherein the quantum dot comprises a shell including cadmium sulfide (CdS) and a core including cadmium selenide (CdSe).
14 . The method of claim 9 , wherein the quantum dot includes a II-VI semiconductor compound, a III-V semiconductor compound, a IV-IV semiconductor compound or a semiconductor compound.
15 . The method of claim 9 , wherein the quantum dot includes a seed and a shell each including a respective II-VI semiconductor compound.
16 . A lighting apparatus, comprising:
a housing structure;
a light emitting diode supported within the housing structure; and
a light conversion layer disposed above the light emitting diode, the light conversion layer comprising a plurality of quantum dots, each quantum dot of the plurality of dots comprising:
a first portion;
a second portion disposed on the first portion, wherein an amount of a residue disposed in or on the second portion is at least 10 parts per million (ppm), wherein the residue is a primary alcohol, a 1,2-diol or a product of a chemical reaction involving the primary alcohol or the 1,2-diol.
17 . The lighting apparatus of claim 16 , wherein any amount of the residue in the first portion is less than the amount of the residue disposed in or on the second portion.
18 . The lighting apparatus of claim 16 , wherein the chemical compound is 1,2-hexanediol.
19 . The lighting apparatus of claim 16 , wherein the chemical compound is 1,2-dodecanediol.
20 . The lighting apparatus of claim 16 , wherein the chemical compound is 1-octadecanol.
21 . The lighting apparatus of claim 16 , wherein each quantum dot of the plurality of dots comprises a shell including cadmium sulfide (CdS) and a core including cadmium selenide (CdSe).
22 . The lighting apparatus of claim 16 , wherein each quantum dot of the plurality of dots includes a II-VI semiconductor compound, a III-V semiconductor compound, a IV-IV semiconductor compound or a semiconductor compound.
23 . The lighting apparatus of claim 16 , wherein each quantum dot of the plurality of dots includes a seed and a shell each including a respective II-VI semiconductor compound.