Optical-Vibrational Properties of the Cs2SnX6 (X = Cl, Br, I) Defect Perovskites and Hole-Transport Efficiency in Dye-Sensitized Solar Cells

Andreas Kaltzoglou, Maria Antoniadou, Athanassios G. Kontos, Constantinos C. Stoumpos, Dorothea Perganti, Eirini Siranidi, Vasilios Raptis, Kalliopi Trohidou, Vassilis Psycharis, Mercouri G Kanatzidis, Polycarpos Falaras

Research output: Contribution to journalArticle

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Abstract

We report the vibrational and optical properties of the 'defect' perovskites Cs2SnX6 (X = Cl, Br, I) as well as their use as hole-transporting materials (HTMs) in solar cells. All three air-stable compounds were characterized using powder X-ray diffraction and Rietveld refinement. Far-IR reflectance, Raman, and UV-vis spectroscopy as well as electronic band structure calculations show that the compounds are direct band gap semiconductors with a pronounced effect of the halogen atom on the size of the energy gap and the vibrational frequencies. Scanning electron microscopy and atomic force microscopy confirmed that the morphology of the perovskite films deposited from N,N-dimethylformamide solutions on TiO2 substrates also strongly depends on the chemical composition of the materials. The Cs2SnX6 perovskites were introduced as hole-transporting materials in dye-sensitized solar cells, based on mesoporous titania electrodes sensitized with various organic and metal-organic dyes. The solar cells based on Cs2SnI6 HTM and the Z907 dye performed best with a maximum power conversion efficiency of 4.23% at 1 sun illumination. The higher performance of Cs2SnI6 is attributed to efficient charge transport in the bulk material and hole extraction at the perovskite-Pt interface, as evidenced by electrochemical impedance spectroscopy.

Original languageEnglish
Pages (from-to)11777-11785
Number of pages9
JournalJournal of Physical Chemistry C
Volume120
Issue number22
DOIs
Publication statusPublished - Jun 9 2016

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perovskites
solar cells
dyes
Defects
defects
Perovskite
Solar cells
Energy gap
Coloring Agents
Dyes
Dimethylformamide
Rietveld refinement
Halogens
halogens
spectroscopy
Vibrational spectra
chemical composition
sun
Ultraviolet spectroscopy
Electrochemical impedance spectroscopy

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Energy(all)

Cite this

Kaltzoglou, A., Antoniadou, M., Kontos, A. G., Stoumpos, C. C., Perganti, D., Siranidi, E., ... Falaras, P. (2016). Optical-Vibrational Properties of the Cs2SnX6 (X = Cl, Br, I) Defect Perovskites and Hole-Transport Efficiency in Dye-Sensitized Solar Cells. Journal of Physical Chemistry C, 120(22), 11777-11785. https://doi.org/10.1021/acs.jpcc.6b02175

Optical-Vibrational Properties of the Cs2SnX6 (X = Cl, Br, I) Defect Perovskites and Hole-Transport Efficiency in Dye-Sensitized Solar Cells. / Kaltzoglou, Andreas; Antoniadou, Maria; Kontos, Athanassios G.; Stoumpos, Constantinos C.; Perganti, Dorothea; Siranidi, Eirini; Raptis, Vasilios; Trohidou, Kalliopi; Psycharis, Vassilis; Kanatzidis, Mercouri G; Falaras, Polycarpos.

In: Journal of Physical Chemistry C, Vol. 120, No. 22, 09.06.2016, p. 11777-11785.

Research output: Contribution to journalArticle

Kaltzoglou, A, Antoniadou, M, Kontos, AG, Stoumpos, CC, Perganti, D, Siranidi, E, Raptis, V, Trohidou, K, Psycharis, V, Kanatzidis, MG & Falaras, P 2016, 'Optical-Vibrational Properties of the Cs2SnX6 (X = Cl, Br, I) Defect Perovskites and Hole-Transport Efficiency in Dye-Sensitized Solar Cells', Journal of Physical Chemistry C, vol. 120, no. 22, pp. 11777-11785. https://doi.org/10.1021/acs.jpcc.6b02175
Kaltzoglou, Andreas ; Antoniadou, Maria ; Kontos, Athanassios G. ; Stoumpos, Constantinos C. ; Perganti, Dorothea ; Siranidi, Eirini ; Raptis, Vasilios ; Trohidou, Kalliopi ; Psycharis, Vassilis ; Kanatzidis, Mercouri G ; Falaras, Polycarpos. / Optical-Vibrational Properties of the Cs2SnX6 (X = Cl, Br, I) Defect Perovskites and Hole-Transport Efficiency in Dye-Sensitized Solar Cells. In: Journal of Physical Chemistry C. 2016 ; Vol. 120, No. 22. pp. 11777-11785.
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