Words to Describe photocathodes

How photocathodes often is described ("________ photocathodes")

• modern
• negative
• solid
• high
• most
• type
• various
• ray
• strained
• several
• semitransparent
• common
• conventional
• sensitive
• commercial
• metallic
• antimonide
• transparent
• practical
• opaque
• alkali
• available
• composite
• typical
• large
• different
• efficient
• standard