نتایج جستجو برای: perovskites

تعداد نتایج: 4518  

2017
Guichuan Xing Bo Wu Xiangyang Wu Mingjie Li Bin Du Qi Wei Jia Guo Edwin K L Yeow Tze Chien Sum Wei Huang

The slow bimolecular recombination that drives three-dimensional lead-halide perovskites' outstanding photovoltaic performance is conversely a fundamental limitation for electroluminescence. Under electroluminescence working conditions with typical charge densities lower than 1015 cm-3, defect-states trapping in three-dimensional perovskites competes effectively with the bimolecular radiative r...

2016
W. Travis E. N. K. Glover H. Bronstein D. O. Scanlon

The tolerance factor is a widely used predictor of perovskite stability. The recent interest in hybrid perovskites for use as solar cell absorbers has lead to application of the tolerance factor to these materials as a way to explain and predict structure. Here we critically assess the suitability of the tolerance factor for halide perovskites. We show that the tolerance factor fails to accurat...

2017
Sebastian F Hoefler Gregor Trimmel Thomas Rath

ABSTRACT Metal halide perovskites have revolutionized the field of solution-processable photovoltaics. Within just a few years, the power conversion efficiencies of perovskite-based solar cells have been improved significantly to over 20%, which makes them now already comparably efficient to silicon-based photovoltaics. This breakthrough in solution-based photovoltaics, however, has the drawbac...

2015
Sarah Brittman Gede Widia Pratama Adhyaksa Erik Christian Garnett

Hybrid inorganic–organic perovskites have emerged over the last 5 years as a promising class of materials for optoelectronic applications. Most notably, their solar cells have achieved power conversion efficiencies above 20% in an unprecedented timeframe; however, many fundamental questions still remain about these materials. This Prospective Article reviews the procedures used to deposit hybri...

Journal: :Journal of the American Chemical Society 2017
Chan Myae Myae Soe Constantinos C Stoumpos Mikaël Kepenekian Boubacar Traoré Hsinhan Tsai Wanyi Nie Binghao Wang Claudine Katan Ram Seshadri Aditya D Mohite Jacky Even Tobin J Marks Mercouri G Kanatzidis

We present the new homologous series (C(NH2)3)(CH3NH3)nPbnI3n+1 (n = 1, 2, 3) of layered 2D perovskites. Structural characterization by single-crystal X-ray diffraction reveals that these compounds adopt an unprecedented structure type, which is stabilized by the alternating ordering of the guanidinium and methylammonium cations in the interlayer space (ACI). Compared to the more common Ruddles...

Journal: :Chemphyschem : a European journal of chemical physics and physical chemistry 2006
Jurriaan Beckers Lars M van der Zande Gadi Rothenberg

The problem of soot emissions from diesel engines is introduced and the possible solution of combining doped perovskites and microwave (mw) irradiation to "clean up" diesel soot filters is outlined. Eighteen doped perovskite catalysts are synthesized and tested for propane and CO oxidation, which are taken as model components for soot. The activity, selectivity, and SO2 tolerance are compared u...

Journal: :Chemical science 2015
D Solis-Ibarra I C Smith H I Karunadasa

Reaction with halogen vapor allows us to post-synthetically exchange halides in both three- (3D) and two-dimensional (2D) organic-inorganic metal-halide perovskites. Films of 3D Pb-I perovskites cleanly convert to films of Pb-Br or Pb-Cl perovskites upon exposure to Br2 or Cl2 gas, respectively. This gas-solid reaction provides a simple method to produce the high-quality Pb-Br or Pb-Cl perovski...

2015
Feng Li Chun Ma Hong Wang Weijin Hu Weili Yu Arif D. Sheikh Tom Wu

Organolead halide perovskites have attracted substantial attention because of their excellent physical properties, which enable them to serve as the active material in emerging hybrid solid-state solar cells. Here we investigate the phototransistors based on hybrid perovskite films and provide direct evidence for their superior carrier transport property with ambipolar characteristics. The fiel...

Journal: :Nano letters 2016
Hung-Chieh Cheng Gongming Wang Dehui Li Qiyuan He Anxiang Yin Yuan Liu Hao Wu Mengning Ding Yu Huang Xiangfeng Duan

The recently emerged organohalide perovskites (e.g., CH3NH3PbI3) have drawn intense attention for high efficiency solar cells. However, with a considerable solubility in many solvents, these perovskites are not typically compatible with conventional lithography processes for more complicated device fabrications that are important for both fundamental studies and technological applications. Here...

Journal: :Nano letters 2016
Yuanyue Liu Hai Xiao William A Goddard

Two-dimensional (2D) halide perovskites are emerging as promising candidates for nanoelectronics and optoelectronics. To realize their full potential, it is important to understand the role of those defects that can strongly impact material properties. In contrast to other popular 2D semiconductors (e.g., transition metal dichalcogenides MX2) for which defects typically induce harmful traps, we...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید