CPC H01L 31/0296 (2013.01) [H01L 31/0304 (2013.01); H01L 31/035218 (2013.01); B82Y 30/00 (2013.01); B82Y 40/00 (2013.01); Y02E 10/544 (2013.01); Y10S 977/774 (2013.01); Y10S 977/89 (2013.01)] | 15 Claims |
1. A nanocrystal comprising:
a core comprising a Group III element, and a Group V element; and
a shell disposed on the core,
wherein the shell comprises a first mole ratio of Se to S at a first position directly disposed on the core, a second mole ratio of Se to S at a second position between a surface of the core and an outermost surface of the shell, and a third mole ratio of Se to S at a third position on an outermost surface of the shell,
wherein the shell comprises a compound of the formula ZnSeyS(1-y) at the first position, wherein 0≤y≤1, and
wherein the shell has a mole ratio gradient of Se to S in a direction from the core to the outermost surface of the shell, the mole ratio gradient of Se to S comprises an increasing mole ratio of Se to S from the first mole ratio of Se to S to the second mole ratio of Se to S in a direction from the first position to the second position, and a decreasing mole ratio of Se to S from the second mole ratio of Se to S to the third mole ratio of Se to S in a direction from the second position to the third position.
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