Excel doesn’t have a direct keyboard shortcut for superscript, but you can format text characters in the Format Cells dialog box—and Excel has a keyboard shortcut to open it.
Format text values as superscript or subscript
This works well when you want to present data in a visually appealing format. To format numeric values or formulas for a mathematical, chemical, or other type of technical expression, use the equation symbols and templates.
Select characters in a cell or cell range that you’d like to format.
On the Home tab, in the Font group, click the Font Settings dialog box launcher.
Under Effects, check the Superscript or Subscript box, and click OK.
Apply superscript or subscript to a numeric value
When you want to present a formula or an equation for numeric values:
Click Insert > Equation > Design.
Click Script and select the format you want.
Click the squares and type the values.
Tip: The equation box isn’t anchored to a cell and you can move, resize or rotate it using the handles.
Also check out formatting options for equations and formulas with the equation tools.