نتایج جستجو برای: based perovskites

تعداد نتایج: 2938220  

2017
María C. Gélvez-Rueda Eline M. Hutter Duyen H. Cao Nicolas Renaud Constantinos C. Stoumpos Joseph T. Hupp Tom J. Savenije Mercouri G. Kanatzidis Ferdinand C. Grozema

The optoelectronic properties of hybrid perovskites can be easily tailored by varying their components. Specifically, mixing the common short organic cation (methylammonium (MA)) with a larger one (e.g., butyl ammonium (BA)) results in 2-dimensional perovskites with varying thicknesses of inorganic layers separated by the large organic cation. In both of these applications, a detailed understan...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2017
Tianran Chen Wei-Liang Chen Benjamin J Foley Jooseop Lee Jacob P C Ruff J Y Peter Ko Craig M Brown Leland W Harriger Depei Zhang Changwon Park Mina Yoon Yu-Ming Chang Joshua J Choi Seung-Hun Lee

Long carrier lifetime is what makes hybrid organic-inorganic perovskites high-performance photovoltaic materials. Several microscopic mechanisms behind the unusually long carrier lifetime have been proposed, such as formation of large polarons, Rashba effect, ferroelectric domains, and photon recycling. Here, we show that the screening of band-edge charge carriers by rotation of organic cation ...

Journal: :Angewandte Chemie 2016
Laura Calió Samrana Kazim Michael Grätzel Shahzada Ahmad

The pressure to move towards renewable energy has inspired researchers to look for ideas in photovoltaics that may lead to a major breakthrough. Recently the use of perovskites as a light harvester has lead to stunning progress. The power conversion efficiency of perovskite solar cells is now approaching parity (>22 %) with that of the established technology which took decades to reach this lev...

2004
Ilya Grinberg Andrew M. Rappe

Using density functional theory calculations, we investigate the feasibility of using silver on the perovskite A-site in high-performance lead-free piezoelectrics. The calculations show that silver atoms are ferroelectrically active and can off-center by 0.5 Å. To induce Ag ferroelctric behavior absent in pure AgNbO3 we explore solid solutions of AgNbO3 with well-known simple perovskites PbTiO3...

2009
Ph. Colomban A. Slodczyk

Analysis of the relative and absolute Raman intensity is very important and powerful tool which allows to understand and characterize the modifications of the crystal/amorphous structure due to: (i) changes of the symmetry, e.g. substitution of the B site ion by the rare earth/lanthanide one and incorporation of mobile species in the case of high temperature protonic conducting perovskites; (ii...

2017
Taiyang Zhang M. Ibrahim Dar Ge Li Feng Xu Nanjie Guo Michael Grätzel Yixin Zhao

Among various all-inorganic halide perovskites exhibiting better stability than organic-inorganic halide perovskites, a-CsPbI3with themost suitable band gap for tandem solar cell application faces an issue of phase instability under ambient conditions. We discovered that a small amount of two-dimensional (2D) EDAPbI4 perovskite containing the ethylenediamine (EDA) cation stabilizes the a-CsPbI3...

Journal: :The journal of physical chemistry letters 2015
George Volonakis Feliciano Giustino

Owing to their record-breaking energy conversion efficiencies, hybrid organometallic perovskites have emerged as the most promising light absorbers and ambipolar carrier transporters for solution-processable solar cells. Simultaneously, due to its exceptional electron mobility, graphene represents a prominent candidate for replacing transparent conducting oxides. Thus, it is possible that combi...

2008
A. CORGNE B. J. WOOD M. T. CORKERY L. M. HEAMAN

A number of geochemical arguments suggest the existence of a deep mantle reservoir enriched in noble gases and heat producing elements and having a subchondritic Nd/Nd ratio [1-4]. To test this hypothesis, the affinity of these elements for the phases involved in the differentiation of the deep mantle must be determined. Partitioning data between Mgand Ca-silicate perovskites and silicate melts...

Journal: :Nano letters 2016
Carolin M Sutter-Fella Yanbo Li Matin Amani Joel W Ager Francesca M Toma Eli Yablonovitch Ian D Sharp Ali Javey

Hybrid organic-inorganic halide perovskite based semiconductor materials are attractive for use in a wide range of optoelectronic devices because they combine the advantages of suitable optoelectronic attributes and simultaneously low-cost solution processability. Here, we present a two-step low-pressure vapor-assisted solution process to grow high quality homogeneous CH3NH3PbI3-xBrx perovskite...

Journal: :Physical review letters 1996
Fontcuberta Martínez Seffar Piñol García-Muñoz Obradors

1.Colossal Magnetoresistance of Ferromagnetic Manganites: Structural Tuning and Mechanisms. Physical Review Letters, 76 (7), (1996), pp. 1122-1125. J. Fontcuberta, B. Martínez, A. Seffar, S. Piñol, J.L. García-Muñoz and X. Obradors. 2.Reduction of the Jahn-Teller disortion at the insulator-to-metal transition in mixed valence manganites. Physical Review B, 54 (24), )1996), pp. 34-37. J.L. Garcí...

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