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Structural and Optical Properties of Cs~2~AgBiBr~6~ Double Perovskite by Laura Schade; Adam D. Wright; Roger D. Johnson; Markus Dollmann; Bernard Wenger; Pabitra K. Nayak; Dharmalingam Prabhakaran; Laura M. Herz; Robin Nicholas; Henry J. Snaith; Paolo G. Radaelli is a Engineering article available to read on EtoBox.
What is Structural and Optical Properties of Cs~2~AgBiBr~6~ Double Perovskite about?
We present a comprehensive study of the relationship between the crystal structure and optoelectronic properties of the double perovskite Cs 2 AgBiBr 6 , which has emerged as a promising candidate for photovoltaic devices. On the basis of single-crystal/powder X-ray diffraction and neutron powder diffraction, we have revealed the presence of a structural phase transition at T s ≈ 122 K between the room-temperature cubic structure (space group Fm3̅ m) and a new low-temperature tetragonal structure (I4/m). From reflectivity measurements we found that the peak exciton energy E ex ≈ 2.85 eV near the direct gap shifts proportionally to the tetragonal strain, which is consistent with the E ex being primarily controlled by a rotational degree of freedom of the crystal structure, thus by the angle Bi-Ag-Br. We observed the time-resolved photoluminescence kinetics and we found that, among the relaxation channels, a fast one is mainly present in the tetragonal phase, suggesting that its origin may lie in the formation of tetragonal twin domains.
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- Author
- Laura Schade; Adam D. Wright; Roger D. Johnson; Markus Dollmann; Bernard Wenger; Pabitra K. Nayak; Dharmalingam Prabhakaran; Laura M. Herz; Robin Nicholas; Henry J. Snaith; Paolo G. Radaelli
- Publisher
- American Chemical Society (ACS)
- Published
- 2018
- Language
- EN
- Field
- Engineering (Physical Sciences)