I believe the specific attribute ye' are looking for is string SerialNumber;
Data type: string
Access type: Read-only
Number allocated by the manufacturer to identify the physical media.
Windows Server 2003, Windows XP, Windows 2000, and Windows NT 4.0: This property is not available.
There doesn't appear to be an attribute specifically for a SSD serial, and there doesn't appear to be a Win32_SolidStateDrive Class.. not sure how windows would handle this situation. It might display all parts of the serial together, in which case you can of course parse the desired info from the string.