Which of the following is not a photoemissive cell?

Which of the following is not a photoemissive cell? Correct Answer gas-filled photocell

Barrier layer cells are photovoltaic cells. They consist of a semiconducting substance, which is generally selenium deposited on a metal base which may be iron and which acts as one of the electrodes. Photovoltaic cells are very robust in construction, need no external electrical supply and produce a photocurrent sometimes stronger than other photosensitive elements.
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Which of the following is a photoemissive cell?
Commonly used photoemissive material is _______
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