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Perovskite (structure)
About: Perovskite (structure) is a research topic. Over the lifetime, 51482 publications have been published within this topic receiving 1541750 citations.
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TL;DR: In this article, a novel one-step solution approach was proposed to prepare perovskite CH3NH3PbI3 films by adding CHNH3Cl (or MACl) to the standard CH3 NH3I and PbI2 solution.
Abstract: We demonstrate a novel one-step solution approach to prepare perovskite CH3NH3PbI3 films by adding CH3NH3Cl (or MACl) to the standard CH3NH3PbI3 precursor (equimolar mixture of CH3NH3I and PbI2) solution. The use of MACl strongly affects the crystallization process of forming pure CH3NH3PbI3, leading not only to enhanced absorption of CH3NH3PbI3 but also to significantly improved coverage of CH3NH3PbI3 on a planar substrate. Compared to the standard one-step solution approach for CH3NH3PbI3, using MACl improves the performance of CH3NH3PbI3 solar cells from about 2% to 12% for the planar cell structure and from about 8% to 10% for the mesostructured device architecture. Although we find no significant effect of using MACl on charge transport and recombination in mesostructured perovskite cells, the recombination resistance for planar cells increases by 1–2 orders of magnitude by using MACl. These results suggest that this new one-step solution approach is promising for controlling CH3NH3PbI3 growth to ach...
490 citations
TL;DR: A family of metal-free organic perovskite ferroelectrics with the characteristic three-dimensional structure is found, among which MDABCO (N-methyl-N'-diazabicyclo[2.2]octonium)–ammonium triiodide has a spontaneous polarization, which makes it attractive for use in flexible devices, soft robotics, biomedical devices, and other applications.
Abstract: Inorganic perovskite ferroelectrics are widely used in nonvolatile memory elements, capacitors, and sensors because of their excellent ferroelectric and other properties. Organic ferroelectrics are desirable for their mechanical flexibility, low weight, environmentally friendly processing, and low processing temperatures. Although almost a century has passed since the first ferroelectric, Rochelle salt, was discovered, examples of highly desirable organic perovskite ferroelectrics are lacking. We found a family of metal-free organic perovskite ferroelectrics with the characteristic three-dimensional structure, among which MDABCO ( N -methyl- N9 -diazabicyclo[2.2.2]octonium)–ammonium triiodide has a spontaneous polarization of 22 microcoulombs per square centimeter [close to that of barium titanate (BTO)], a high phase transition temperature of 448 kelvins (above that of BTO), and eight possible polarization directions. These attributes make it attractive for use in flexible devices, soft robotics, biomedical devices, and other applications.
489 citations
TL;DR: It is shown through high-resolution in situ synchrotron XRD measurements that CsPbI3 can be undercooled below its transition temperature and temporarily maintained in its perovskite structure down to room temperature, stabilizing a metastable perovkite polytype (black γ-phase) crucial for photovoltaic applications.
Abstract: Hybrid organic–inorganic perovskites emerged as a new generation of absorber materials for high-efficiency low-cost solar cells in 2009. Very recently, fully inorganic perovskite quantum dots also led to promising efficiencies, making them a potentially stable and efficient alternative to their hybrid cousins. Currently, the record efficiency is obtained with CsPbI3, whose crystallographical characterization is still limited. Here, we show through high-resolution in situ synchrotron XRD measurements that CsPbI3 can be undercooled below its transition temperature and temporarily maintained in its perovskite structure down to room temperature, stabilizing a metastable perovskite polytype (black γ-phase) crucial for photovoltaic applications. Our analysis of the structural phase transitions reveals a highly anisotropic evolution of the individual lattice parameters versus temperature. Structural, vibrational, and electronic properties of all the experimentally observed black phases are further inspected base...
489 citations
TL;DR: In this paper, catalytic oxidation of methane was carried out over various perovskite-type oxides and compared with Pt/alumina catalyst at a conversion level below 80%.
487 citations
TL;DR: In this paper, a structural phase transition in which oxygen vacancies order into two-dimensional planar arrays capable of pinning domain wall motion was proposed, and a paradigm for fatigue in ferroelectric perovskite oxides was presented.
Abstract: We present a paradigm for fatigue in ferroelectric perovskite oxides: That of a structural phase transition in which oxygen vacancies order into two-dimensional planar arrays capable of pinning domain wall motion.
486 citations