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

Journal Article · · Nature Communications

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.

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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Review on Recent Progress of All‐Inorganic Metal Halide Perovskites and Solar Cells journal September 2019
Metal Cations in Efficient Perovskite Solar Cells: Progress and Perspective journal July 2019
A Review on Additives for Halide Perovskite Solar Cells journal April 2020
Stability improvement under high efficiency—next stage development of perovskite solar cells journal April 2019
The Role of Dimethylammonium Iodide in CsPbI 3 Perovskite Fabrication: Additive or Dopant? journal November 2019
Inorganic CsPbI 3 Perovskites toward High‐Efficiency Photovoltaics journal June 2019
Perovskite Solar Cells: Can We Go Organic‐Free, Lead‐Free, and Dopant‐Free? journal October 2019
Strategies Toward Extending the Near‐Infrared Photovoltaic Response of Perovskite Solar Cells journal August 2019
The Role of Dimethylammonium Iodide in CsPbI 3 Perovskite Fabrication: Additive or Dopant? journal October 2019
Chemical stability and instability of inorganic halide perovskites journal January 2019
Efficient and Stable CsPbI 3 Solar Cells via Regulating Lattice Distortion with Surface Organic Terminal Groups journal April 2019
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Skillfully deflecting the question: a small amount of piperazine-1,4-diium iodide radically enhances the thermal stability of CsPbI 3 perovskite journal January 2019
Low-dimensional emissive states in non-stoichiometric methylammonium lead halide perovskites journal January 2019
Unveiling Property of Hydrolysis-Derived DMAPbI3 for Perovskite Devices: Composition Engineering, Defect Mitigation, and Stability Optimization journal May 2019
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Stabilizing the black phase of cesium lead halide inorganic perovskite for efficient solar cells journal June 2019
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Stabilization of all-inorganic α -CsPbI 3 perovskite by Bi or Sb doping journal August 2019
Synthesis of a two-dimensional organic–inorganic bismuth iodide metalate through in situ formation of iminium cations journal January 2019
Improved phase stability of the CsPbI 3 perovskite via organic cation doping journal January 2019
Unique characteristics of 2D Ruddlesden–Popper (2DRP) perovskite for future photovoltaic application journal January 2019
Rational Core–Shell Design of Open Air Low Temperature In Situ Processable CsPbI 3 Quasi‐Nanocrystals for Stabilized p‐i‐n Solar Cells journal July 2019
Enhanced air-stability of Sn-based hybrid perovskites induced by dimethylammonium (DMA): synthesis, characterization, aging and hydrogen photogeneration of the MA 1−x DMA x SnBr 3 system journal January 2019
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