Detail publikace

Temperature-Dependent Excitonic Band Gap in Lead-Free Bismuth Halide Low-Dimensional Perovskite Single Crystals

VALASTRO, S. GAVRANOVIĆ, S. DERETZIS, I. VALA, M. SMECCA, E. LA MAGNA, A. ALBERTI, A. ČÁSTKOVÁ, K. MANNINO, G.

Originální název

Temperature-Dependent Excitonic Band Gap in Lead-Free Bismuth Halide Low-Dimensional Perovskite Single Crystals

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

In this study, the optical behavior of lead-free Bi-based low-dimensional perovskite single crystals (Cs3Bi2Cl9, Cs3Bi2Br9, Cs3Bi2I9, and MA3Bi2I9) is investigated by spectroscopic ellipsometry, supported by X-ray diffraction and density functional theory calculations. All materials exhibit a strong excitonic peak resulting from photogenerated electron-hole Coulomb interactions, whereas the threshold of continuous absorption is found at higher energies. The resonances of the excitonic and continuous bands, along with exciton binding energies, are extracted through Critical Point Analysis of the ellipsometric data over a wide temperature range (from -90 degrees C to 90 degrees C), revealing subtle variations in the optical characteristics for each single crystal. These materials can be applied in optoelectronics as photodetectors because of their high stability and lower toxicity compared to their Pb-based perovskites. The optical behavior of Bi-based perovskite single crystals (Cs3Bi2Cl9, Cs3Bi2Br9, Cs3Bi2I9, and MA3Bi2I9) is studied by spectroscopic ellipsometry. A strong excitonic peak for all materials is detected, arising from photogenerated electron-hole Coulomb interactions. The threshold of continuous absorption is at higher energies. The resonances of the excitonic and continuous bands are extracted using Critical Point Analysis in the temperature range from -90 degrees C to 90 degrees C.image

Klíčová slova

dielectric function; excitonic binding energy; Lead-free perovskites; optical bandgap; single crystal; spectroscopic ellipsometry

Autoři

VALASTRO, S.; GAVRANOVIĆ, S.; DERETZIS, I.; VALA, M.; SMECCA, E.; LA MAGNA, A.; ALBERTI, A.; ČÁSTKOVÁ, K.; MANNINO, G.

Vydáno

24. 12. 2023

Nakladatel

WILEY-V C H VERLAG GMBH

Místo

WEINHEIM

ISSN

2195-1071

Periodikum

Advanced Optical Materials

Číslo

2302397

Stát

Spolková republika Německo

Strany od

1

Strany do

10

Strany počet

10

URL

https://onlinelibrary.wiley.com/doi/full/10.1002/adom.202302397

BibTex

@article{BUT187047,
  author="Salvatore {Valastro} and Stevan {Gavranović} and Ioannis {Deretzis} and Martin {Vala} and Emanuele {Smecca} and Antonino {La Magna} and Alessandra {Alberti} and Klára {Částková} and Giovanni {Mannino}",
  title="Temperature-Dependent Excitonic Band Gap in Lead-Free Bismuth Halide Low-Dimensional Perovskite Single Crystals",
  journal="Advanced Optical Materials",
  year="2023",
  number="2302397",
  pages="1--10",
  doi="10.1002/adom.202302397",
  issn="2195-1071",
  url="https://onlinelibrary.wiley.com/doi/full/10.1002/adom.202302397"
}