排序方式: 共有7条查询结果,搜索用时 744 毫秒
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Valentin I. E. Queloz Marine E. F. Bouduban Ines García‐Benito Alexander Fedorovskiy Simonetta Orlandi Marco Cavazzini Gianluca Pozzi Harsh Trivedi Doru C. Lupascu David Beljonne Jaques‐E Moser Mohammad Khaja Nazeeruddin Claudio Quarti Giulia Grancini 《Advanced functional materials》2020,30(28)
2D hybrid perovskites (2DP) are versatile materials, whose electronic and optical properties can be tuned through the nature of the organic cations (even when those are seemingly electronically inert). Here, it is demonstrated that fluorination of the organic ligands yields glassy 2DP materials featuring long‐lived correlated electron–hole pairs. Such states have a marked charge‐transfer character, as revealed by the persistent Stark effect in the form of a second derivative in electroabsorption. Modeling shows that electrostatic effects associated with fluorination, combined with the steric hindrance due to the bulky side groups, drive the formation of spatially dislocated charge pairs with reduced recombination rates. This work enriches and broadens the current knowledge of the photophysics of 2DP, which will hopefully guide synthesis efforts toward novel materials with improved functionalities. 相似文献
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Mobile code is slowly gaining acceptance but it is still not clear where it is really useful. If not used judiciously it may incur greater complexity of programming and degradation of performances. The goal of this paper is to show that mobile code is particularly well suited as a glue for the composition of immobile services, where flexibility and extensibility are necessary. To support our claim we describe two services and one application that have been programmed with mobile code in the context of active networking. We study the impact on the flexibility, complexity and performance of the resulting systems. We observe positive effects on flexibility and complexity and acceptable performance penalties. 相似文献
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Hobeom Kim Mingyuan Pei Yonghui Lee Albertus A. Sutanto Sanghyun Paek Valentin I. E. Queloz Aron J. Huckaba Kyung Taek Cho Hyung Joong Yun Hoichang Yang Mohammad Khaja Nazeeruddin 《Advanced functional materials》2020,30(19)
Recently, perovskite solar cells (PSC) with high power‐conversion efficiency (PCE) and long‐term stability have been achieved by employing 2D perovskite layers on 3D perovskite light absorbers. However, in‐depth studies on the material and the interface between the two perovskite layers are still required to understand the role of the 2D perovskite in PSCs. Self‐crystallization of 2D perovskite is successfully induced by deposition of benzyl ammonium iodide (BnAI) on top of a 3D perovskite light absorber. The self‐crystallized 2D perovskite can perform a multifunctional role in facilitating hole transfer, owing to its random crystalline orientation and passivating traps in the 3D perovskite. The use of the multifunctional 2D perovskite (M2P) leads to improvement in PCE and long‐term stability of PSCs both with and without organic hole transporting material (HTM), 2,2′,7,7′‐tetrakis‐(N,N‐di‐p‐methoxyphenyl‐amine)‐9,9′‐spirobifluorene (spiro‐OMeTAD) compared to the devices without the M2P. 相似文献
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Rui Xia Xiao-Xin Gao Yi Zhang Nikita Drigo Valentin I. E. Queloz Farzaneh Fadaei Tirani Rosario Scopelliti Zhangjun Huang Xiaodong Fang Sachin Kinge Zhaofu Fei Cristina Roldán-Carmona Mohammad Khaja Nazeeruddin Paul J. Dyson 《Advanced materials (Deerfield Beach, Fla.)》2020,32(40):2003801
Despite the excellent photovoltaic properties achieved by perovskite solar cells at the laboratory scale, hybrid perovskites decompose in the presence of air, especially at high temperatures and in humid environments. Consequently, high-efficiency perovskites are usually prepared in dry/inert environments, which are expensive and less convenient for scale-up purposes. Here, a new approach based on the inclusion of an in situ polymerizable ionic liquid, 1,3-bis(4-vinylbenzyl)imidazolium chloride ([bvbim]Cl), is presented, which allows perovskite films to be manufactured under humid environments, additionally leading to a material with improved quality and long-term stability. The approach, which is transferrable to several perovskite formulations, allows efficiencies as high as 17% for MAPbI3 processed in air % relative humidity (RH) ≥30 (from an initial 15%), and 19.92% for FAMAPbI3 fabricated in %RH ≥50 (from an initial 17%), providing one of the best performances to date under similar conditions. 相似文献
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