Advanced Functional Materials

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ISSN / EISSN : 1616-301X / 1616-3028
Published by: Wiley-Blackwell (10.1002)
Total articles ≅ 18,746
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Feng Guo, Menglin Song, Man‐Chung Wong, Ran Ding, Weng Fu Io, Sin‐Yi Pang, ,
Published: 23 October 2021
Advanced Functional Materials; https://doi.org/10.1002/adfm.202108014

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, , , Claudia Li, , Xuefeng Zhu, , , , Ahmed F. Ghoniem, et al.
Published: 23 October 2021
Advanced Functional Materials; https://doi.org/10.1002/adfm.202105702

Abstract:
Mixed ionic-electronic conducting (MIEC) membranes have gained growing interest recently for various promising environmental and energy applications, such as H2 and O2 production, CO2 reduction, O2 and H2 separation, CO2 separation, membrane reactors for production of chemicals, cathode development for solid oxide fuel cells, solar-driven evaporation and energy-saving regeneration as well as electrolyzer cells for power-to-X technologies. The purpose of this roadmap, written by international specialists in their fields, is to present a snapshot of the state-of-the-art, and provide opinions on the future challenges and opportunities in this complex multidisciplinary research field. As the fundamentals of using MIEC membranes for various applications become increasingly challenging tasks, particularly in view of the growing interdisciplinary nature of this field, a better understanding of the underlying physical and chemical processes is also crucial to enable the career advancement of the next generation of researchers. As an integrated and combined article, it is hoped that this roadmap, covering all these aspects, will be informative to support further progress in academics as well as in the industry-oriented research toward commercialization of MIEC membranes for different applications.
Chaoqiang Qiao, Xiaofei Wang, GuoHuan Liu, Zuo Yang, Qian Jia, Lexuan Wang, Ruili Zhang, Yuqiong Xia, Zhongliang Wang,
Published: 23 October 2021
Advanced Functional Materials; https://doi.org/10.1002/adfm.202107791

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Lei Yang, Changping Wang, Lin Li, Fang Zhu, Xiancheng Ren, Quan Huang, , Yiwen Li
Published: 23 October 2021
Advanced Functional Materials; https://doi.org/10.1002/adfm.202108749

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, , Guillermo Arregui, Martin F. Colombano, Nestor E. Capuj, , , , Jouni Ahopelto,
Published: 23 October 2021
Advanced Functional Materials; https://doi.org/10.1002/adfm.202105767

Abstract:
Controlling thermal energy transfer at the nanoscale and thermal properties has become critically important in many applications since it often limits device performance. In this study, the effects on thermal conductivity arising from the nanoscale structure of free-standing nanocrystalline silicon films and the increasing surface-to-volume ratio when fabricated into suspended optomechanical nanobeams are studied. Thermal transport and elucidate the relative impact of different grain size distributions and geometrical dimensions on thermal conductivity are characterized. A micro time-domain thermoreflectance method to study free-standing nanocrystalline silicon films and find a drastic reduction in the thermal conductivity, down to values below 10 W m–1 K–1 is used, with a stronger decrease for smaller grains. In optomechanical nanostructures, this effect is smaller than in membranes due to the competition of surface scattering in decreasing thermal conductivity. Finally, a novel versatile contactless characterization technique that can be adapted to any structure supporting a thermally shifted optical resonance is introduced. The thermal conductivity data agrees quantitatively with the thermoreflectance measurements. This study opens the way to a more generalized thermal characterization of optomechanical cavities and to create hot-spots with engineered shapes at the desired position in the structures as a means to study thermal transport in coupled photon-phonon structures.
, Carl‐Friedrich Schön, Mathias Schumacher, John Robertson, Pavlo Golub, Eric Bousquet, Carlo Gatti, Jean‐Yves Raty
Published: 23 October 2021
Advanced Functional Materials; https://doi.org/10.1002/adfm.202110166

Abstract:
Outstanding photovoltaic (PV) materials combine a set of advantageous properties including large optical absorption and high charge carrier mobility, facilitated by small effective masses. Halide perovskites (ABX3, where X = I, Br, or Cl) are among the most promising PV materials. Their optoelectronic properties are governed by the BX bond, which is responsible for the pronounced optical absorption and the small effective masses of the charge carriers. These properties are frequently attributed to the ns2 configuration of the B atom, i.e., Pb 6s2 or Sn 5s2 (“lone-pair”) states. The analysis of the PV properties in conjunction with a quantum-chemical bond analysis reveals a different scenario. The BX bond differs significantly from ionic, metallic, or conventional 2c2e covalent bonds. Instead it is better regarded as metavalent, since it shares about one p-electron between adjacent atoms. The resulting σ-bond, formally a 2c1e bond, is half-filled, causing pronounced optical absorption. Electron transfer between B and X atoms and lattice distortions open a moderate bandgap resulting in charge carriers with small effective masses. Hence, metavalent bonding explains favorable PV properties of halide perovskites, as summarized in a map for different bond types, which provides a blueprint to design PV materials.
Mun Kyoung Kim, Hojeong Lee, Jong Ho Won, WooHyeong Sim, Shin Joon Kang, Hansaem Choi, Monika Sharma, Hyung‐Suk Oh, , , et al.
Published: 23 October 2021
Advanced Functional Materials; https://doi.org/10.1002/adfm.202107349

The publisher has not yet granted permission to display this abstract.
, Saeed Younis, Giuseppe Mattioli, Marco Felici, Elena Blundo, Antonio Polimeni, Giorgio Pettinari, Damiano Giubertoni, Eduard Sterzer, Kerstin Volz, et al.
Published: 22 October 2021
Advanced Functional Materials; https://doi.org/10.1002/adfm.202108862

Abstract:
In dilute nitride InyGa1−yAs1−xNx alloys, a spatially controlled tuning of the energy gap can be realized by combining the introduction of N atoms—inducing a significant reduction of this parameter—with that of hydrogen atoms, which neutralize the effect of N. In these alloys, hydrogen forms N–H complexes in both Ga-rich and In-rich N environments. Here, photoluminescence measurements and thermal annealing treatments show that, surprisingly, N neutralization by H is significantly inhibited when the number of In-N bonds increases. Density functional theory calculations account for this result and reveal an original, physical phenomenon: only in the In-rich N environment, the InyGa1−yAs host matrix exerts a selective action on the N–H complexes by hindering the formation of the complexes more effective in the N passivation. This thoroughly overturns the usual perspective of defect-engineering by proposing a novel paradigm where a major role pertains to the defect-surrounding matrix.
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