WSe2 (Tungsten Diselenide) is a very stable semiconductor in the group-VI transition metal dichalcogenides. WSe2 photoelectrodes are stable in both acidic and basic conditions, making them potentially useful in electrochemical solar cells. Also, the material can be changed from p-type to n-type by changing the voltage of an adjacent metal electrode from positive to negative, allowing devices made from it to have tunable bandgaps. As a result, it may enable LEDs of any color to be made from a single material.
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