20. Titanium dioxide (TiO₂) is a well-known photosensitive semiconductor for various photocatalysis. What is the incorrect statement regarding TiO₂ materials?
(A) The band gap corresponds to UV-light absorption.
(B) Generally considered as n-type semiconductor.
(C) Increased life time of separated photo-charges in TiO₂ results in weaker photocatalytic activities.
(D) A white color material.
(E) It has two phases of anatase and rutile stable in ambient conditions.