Myths and reality of HPbI3 in halide perovskite solar cells

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

doi:10.1038/s41467-018-07204-y

Title: Myths and reality of HPbI₃ in halide perovskite solar cells

Journal Article · 13 November 2018 · Nature Communications

DOI: https://doi.org/10.1038/s41467-018-07204-y · OSTI ID:1566604

Ke, Weijun ^[1];

^[1];

^[1]; Kanatzidis, Mercouri G. ^[1]

Northwestern Univ., Evanston, IL (United States)

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 (Cs_1-xDMA_xPbI₃, 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 Cs_0.7DMA_0.3PbI₃ 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.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Center for Light Energy Activated Redox Processes (LEAP); Northwestern Univ., Evanston, IL (United States); Univ. of California, Santa Barbara, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)

Grant/Contract Number:: SC0001059; SC0012541

OSTI ID:: 1566604

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 9; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Myths and reality of HPbI3 in halide perovskite solar cells

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Title: Myths and reality of HPbI₃ in halide perovskite solar cells