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A method for preparing thin films of CsPbI 3 and Cs 4 PbI 6 complex compounds has been developed. Their absorption spectrum is investigated in the energy range of 2–6 eV at temperatures from 90 to 500 K. It is found that the CsPbI 3 compound is unstable and passes to the Cs 4 PbI 6 phase upon heating at T ≥ 400 K.
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Yunakova et al. (2012) studied this question.
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