نتایج جستجو برای: bonds

تعداد نتایج: 50088  

2015
S. Carretero-Palacios M. E. Calvo H. Míguez

We report on the numerical analysis of solar absorption enhancement in organic-inorganic halide perovskite films embedding plasmonic gold nanoparticles. The effect of particle size and concentration is analyzed in realistic systems in which random particle location within the perovskite film and the eventual formation of dimers are also taken into account. We find a maximum integrated solar abs...

Journal: :Chemical communications 2005
Gavin D Jones Chris McFarland Thomas J Anderson David A Vicic

The use of tpy'(tpy'= 4,4',4''-tri-tert-butyl-terpyridine) as a ligand for nickel allows for the isolation of a Ni(I)-alkyl complex and a Ni(II)-alkyl halide complex, both of which can be used as mechanistic probes of key steps in alkyl cross-coupling reactions.

2018
Gergely F. Samu Rebecca A. Scheidt Prashant V. Kamat Csaba Janáky

The unique optoelectronic properties of lead halide perovskites have triggered a new wave of excitement in materials chemistry during the past five years. Electrochemistry, spectroelectrochemistry, and photoelectrochemistry could be viable tools both for analyzing the optoelectronic features of these materials and for assembling them into hybrid architectures (e.g., solar cells). At the same ti...

Journal: :Physical chemistry chemical physics : PCCP 2017
Yucheng Wang Yuming Zhang Tiqiang Pang Jie Xu Ziyang Hu Yuejin Zhu Xiaoyan Tang Suzhen Luan Renxu Jia

Organic-inorganic metal halide perovskites are promising semiconductors for optoelectronic applications. Despite the achievements in device performance, the electrical properties of perovskites have stagnated. Ion migration is speculated to be the main contributing factor for the many unusual electrical phenomena in perovskite-based devices. Here, to understand the intrinsic electrical behavior...

Journal: :The journal of physical chemistry letters 2015
Nathan Z Koocher Diomedes Saldana-Greco Fenggong Wang Shi Liu Andrew M Rappe

The instability of organometal halide perovskites when in contact with water is a serious challenge to their feasibility as solar cell materials. Although studies of moisture exposure have been conducted, an atomistic understanding of the degradation mechanism is required. Toward this goal, we study the interaction of water with the (001) surfaces of CH3NH3PbI3 under low and high water concentr...

Journal: :Physical chemistry chemical physics : PCCP 2016
Qiushi Zhu Kaibo Zheng Mohamed Abdellah Alexander Generalov Dörthe Haase Stefan Carlson Yuran Niu Jimmy Heimdal Anders Engdahl Maria E Messing Tonu Pullerits Sophie E Canton

After having emerged as primary contenders in the race for highly efficient optoelectronics materials, organolead halide perovskites (OHLP) are now being investigated in the nanoscale regime as promising building blocks with unique properties. For example, unlike their bulk counterpart, quantum dots of OHLP are brightly luminescent, owing to large exciton binding energies that cannot be rationa...

2016
Nam-Gyu Park

Since the report on long-term durable solid-state perovskite solar cell in 2012, perovskite solar cells based on lead halide perovskites having organic cations such as methylammonium CH3NH3PbI3 or formamidinium HC(NH2)2PbI3 have received great attention because of superb photovoltaic performance with power conversion efficiency exceeding 22 %. In this review, emergence of perovskite solar cell ...

Journal: :international journal of new chemistry 0

in this research at the first enalapril drug and its fullerene derivative were optimized. nbo calculations and nmr for the complexes were carried out at the b3lyp/6-31g* quantum chemistry level. different parameters such as energy levels, the amount of chemical shift in different atoms, the amount of homo/lumo, chemical potential (µ ), chemical hardness (η), the coefficients of hybrid bonds (π,...

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