U.S. Photocell Market Size, Share, Competitive Landscape and Trend Analysis Report, by Type (Photo Conductive cell, Photo Emissive Cell, Photo Voltaic Cell), by Voltage Rating (Crystalline Silicon, Amorphous Silicon, Polysilicon), by Application (Automatic Lights, Automatic Doors, Aviation, Meteorology): Opportunity Analysis and Industry Forecast, 2021-2031