Myths and reality of HPbI3 in halide perovskite solar cells

Weijun Ke, Ioannis Spanopoulos, Constantinos C. Stoumpos () and Mercouri G. Kanatzidis ()
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Weijun Ke: Northwestern University
Ioannis Spanopoulos: Northwestern University
Constantinos C. Stoumpos: Northwestern University
Mercouri G. Kanatzidis: Northwestern University

Nature Communications, 2018, vol. 9, issue 1, 1-9

Abstract: 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.

Date: 2018
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DOI: 10.1038/s41467-018-07204-y

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