Myths and reality of HPbI3 in halide perovskite solar cells

Weijun Ke, Ioannis Spanopoulos, Constantinos C. Stoumpos, Mercouri G Kanatzidis

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

All-inorganic perovskites have a special place in halide perovskite family because of their potential for better stability. However, the representative cesium lead iodide (CsPbI3) is metastable and spontaneously converts to the non-perovskite structure at room temperature. Here, we demonstrate that what appears to be all-inorganic CsPbI3 stabilized in its perovskite form using the purported intermediate known as hydrogen lead iodide (HPbI3) is, in fact, the hybrid perovskite cesium dimethylammonium lead iodide (Cs1−xDMAxPbI3, x = 0.2 to 0.5). Thus, many of the reported all-inorganic perovskites are actually still hybrid organic-inorganic perovskites, as strongly evidenced by a wide battery of experimental techniques presented here. Solar cells based on the representative composition Cs0.7DMA0.3PbI3 can achieve an average power conversion efficiency of 9.27 ± 1.28% (max 12.62%). These results provide an alternative angle to look at previous results pertaining all-inorganic CsPbI3 while the DMA cation is now revealed as an alternative A site cation.

Original languageEnglish
Article number4785
JournalNature Communications
Volume9
Issue number1
DOIs
Publication statusPublished - Dec 1 2018

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Iodides
perovskites
iodides
halides
Cesium
solar cells
cesium
Cations
cations
Dynamic mechanical analysis
Conversion efficiency
electric batteries
Hydrogen
Solar cells
Temperature
room temperature
hydrogen
Chemical analysis
perovskite
Perovskite solar cells

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

Cite this

Myths and reality of HPbI3 in halide perovskite solar cells. / Ke, Weijun; Spanopoulos, Ioannis; Stoumpos, Constantinos C.; Kanatzidis, Mercouri G.

In: Nature Communications, Vol. 9, No. 1, 4785, 01.12.2018.

Research output: Contribution to journalArticle

Ke, Weijun ; Spanopoulos, Ioannis ; Stoumpos, Constantinos C. ; Kanatzidis, Mercouri G. / Myths and reality of HPbI3 in halide perovskite solar cells. In: Nature Communications. 2018 ; Vol. 9, No. 1.
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