Anomalous band gap behavior in mixed Sn and Pb perovskites enables broadening of absorption spectrum in solar cells

Feng Hao, Constantinos C. Stoumpos, Robert P. H. Chang, Mercouri G Kanatzidis

Research output: Contribution to journalArticle

514 Citations (Scopus)

Abstract

Perovskite-based solar cells have recently been catapulted to the cutting edge of thin-film photovoltaic research and development because of their promise for high-power conversion efficiencies and ease of fabrication. Two types of generic perovskites compounds have been used in cell fabrication: either Pb- or Sn-based. Here, we describe the performance of perovskite solar cells based on alloyed perovskite solid solutions of methylammonium tin iodide and its lead analogue (CH3NH3Sn1-xPbxI 3). We exploit the fact that, the energy band gaps of the mixed Pb/Sn compounds do not follow a linear trend (the Vegard's law) in between these two extremes of 1.55 and 1.35 eV, respectively, but have narrower bandgap (3NH3Sn 0.5Pb0.5I3 has the broadest light absorption and highest short-circuit photocurrent density ∼20 mA cm-2 (obtained under simulated full sunlight of 100 mW cm-2).

Original languageEnglish
Pages (from-to)8094-8099
Number of pages6
JournalJournal of the American Chemical Society
Volume136
Issue number22
DOIs
Publication statusPublished - Jun 4 2014

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Perovskite
Absorption spectra
Solar cells
Energy gap
Fabrication
Tin
Iodides
Photocurrents
Short circuit currents
Band structure
Light absorption
Conversion efficiency
Solid solutions
Lead
Sunlight
Thin films
Research
perovskite
Perovskite solar cells
methylamine

ASJC Scopus subject areas

  • Chemistry(all)
  • Catalysis
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

Anomalous band gap behavior in mixed Sn and Pb perovskites enables broadening of absorption spectrum in solar cells. / Hao, Feng; Stoumpos, Constantinos C.; Chang, Robert P. H.; Kanatzidis, Mercouri G.

In: Journal of the American Chemical Society, Vol. 136, No. 22, 04.06.2014, p. 8094-8099.

Research output: Contribution to journalArticle

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