A self-trapped hole in Cs2AgI3

gamma-ray irradiation induced a self-trapped hole only of the form of I-2(-) in Cs2AgI3 in contrast to other alkali silver iodides, in which I-0 is stable, or ammonium silver halides and alkali-ammonium silver iodides, in which both of (halogen)(2)(-) and (halogen)(0) are stable. Electronic band structure in fundamental absorption region of Cs2AgI3 was the same as those of other alkali silver iodides. Therefore the structure of the self-trapped hole in Cs2AgI3 is due to not only the electronic band structure but also another factor.