Perovskite (structure)

About: Perovskite (structure) is a research topic. Over the lifetime, 51482 publications have been published within this topic receiving 1541750 citations.

Efficient Luminescence from Perovskite Quantum Dot Solids

Abstract: Nanocrystals of CsPbX3 perovskites are promising materials for light-emitting optoelectronics because of their colloidal stability, optically tunable bandgap, bright photoluminescence, and excellent photoluminescence quantum yield. Despite their promise, nanocrystal-only films of CsPbX3 perovskites have not yet been fabricated; instead, highly insulating polymers have been relied upon to compensate for nanocrystals’ unstable surfaces. We develop solution chemistry that enables single-step casting of perovskite nanocrystal films and overcomes problems in both perovskite quantum dot purification and film fabrication. Centrifugally cast films retain bright photoluminescence and achieve dense and homogeneous morphologies. The new materials offer a platform for optoelectronic applications of perovskite quantum dot solids.

Stability of Perovskite Solar Cells: A Prospective on the Substitution of the A Cation and X Anion.

Abstract: In recent years, organometal trihalide perovskites have emerged as promising materials for low-cost, flexible, and highly efficient solar cells. Despite their processing advantages, before the technology can be commercialized the poor stability of the organic–inorganic hybrid perovskite materials with regard to humidity, heat, light, and oxygen has be to overcome. Herein, we distill the current state-of-the-art and highlight recent advances in improving the chemical stability of perovskite materials by substitution of the A-cation and X-anion. Our hope is to pave the way for the rational design of perovskite materials to realize perovskite solar cells with unprecedented improvement in stability.

Local Polar Fluctuations in Lead Halide Perovskite Crystals.

Abstract: Hybrid lead-halide perovskites have emerged as an excellent class of photovoltaic materials. Recent reports suggest that the organic molecular cation is responsible for local polar fluctuations that inhibit carrier recombination. We combine low-frequency Raman scattering with first-principles molecular dynamics (MD) to study the fundamental nature of these local polar fluctuations. Our observations of a strong central peak in the cubic phase of both hybrid (CH_{3}NH_{3}PbBr_{3}) and all-inorganic (CsPbBr_{3}) lead-halide perovskites show that anharmonic, local polar fluctuations are intrinsic to the general lead-halide perovskite structure, and not unique to the dipolar organic cation. MD simulations indicate that head-to-head Cs motion coupled to Br face expansion, occurring on a few hundred femtosecond time scale, drives the local polar fluctuations in CsPbBr_{3}.

A lead-halide perovskite molecular ferroelectric semiconductor

Abstract: Inorganic semiconductor ferroelectrics such as BiFeO3 have shown great potential in photovoltaic and other applications. Currently, semiconducting properties and the corresponding application in optoelectronic devices of hybrid organo-plumbate or stannate are a hot topic of academic research; more and more of such hybrids have been synthesized. Structurally, these hybrids are suitable for exploration of ferroelectricity. Therefore, the design of molecular ferroelectric semiconductors based on these hybrids provides a possibility to obtain new or high-performance semiconductor ferroelectrics. Here we investigated Pb-layered perovskites, and found the layer perovskite (benzylammonium)2PbCl4 is ferroelectric with semiconducting behaviours. It has a larger ferroelectric spontaneous polarization Ps=13 μC cm(-2) and a higher Curie temperature Tc=438 K with a band gap of 3.65 eV. This finding throws light on the new properties of the hybrid organo-plumbate or stannate compounds and provides a new way to develop new semiconductor ferroelectrics.

Properties and Applications of Perovskite-Type Oxides

Abstract: Preparation of bulk and supported perovskites, J. Twu and P.K. Gallagher high Tc superconductive cuprates - processing and properties, C. Moure and P. Duran oxidative nonstoichiometry in perovskite oxides, D.M. Smyth high Tc superconductive cuprates - classification and nonstoichiometry, B. Raveau et al thermoelectrical properties of some copper perovskite-type materials, O. Cabeza et al optical spectroscopy of perovskite-type oxides, G. Blasse poisoning of perovskite oxides by sulfur dioxide, Li Wan infrared spectroscopy and temperature-programmed desorption of perovskite surfaces, J.M.D. Tascon et al composition and structure of perovskite surfaces, J.L.G. Fierro total oxidation of hydrocarbons on perovskite oxides, T. Seiyama hydrogenation and hydrogenolysis of hydrocarbons on perovskite oxides, K. Ichimura et al hydrogenation of carbon oxides over perovskite-type oxides, J.L.G. Fierro CO oxidation and NO reduction on perovskite oxides, B. Viswanathan partial oxidation of hydrocarbons and oxygenated compounds on perovskite oxides, T. Shimizu photocatalysis on fine powders of perovskite oxides, R.T.N. Kutty and M. Avudaithai reduction of sulfur dioxide on perovskite oxides, D. Brynn Hibbert decomposition of N2O on perovskite-related oxides, C.S. Swarmy and J. Christopher perovskite oxides as solid state chemical sensors, T. Arakawa.