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An Unprecedented Efficiency with Approaching 21%Enabled by Additive‑Assisted Layer‑by‑Layer Processing in Organic Solar Cells

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Nano-Micro Letters 2025年第2期17卷 372-375页

作者： Shuai Xu Youdi Zhang Yanna Sun Pei Cheng Zhaoyang Yao Ning Li Long Ye Lijian Zuo Ke Gao Key laboratory of Advanced Green Functional Materials College of ChemistryChangchun Normal UniversityChangchun 130032People’s Republic of China Shandong Provincial Key laboratory for Science of Material Creation and Energy Conversion School of Chemistry and Chemical EngineeringShandong UniversityQingdao 266237People’s Republic of China College of Polymer Science and Engineering Sichuan UniversityChengdu 610065People’s Republic of China State Key laboratory and Institute of Elemento‑Organic Chemistry Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer MaterialsRenewable Energy Conversion and Storage Center(RECAST)College of ChemistryNankai UniversityTianjin 300071People’s Republic of China Institute of Polymer Optoelectronic Materials and Devices State Key laboratory of Luminescent Materials and Devices South China University of TechnologyGuangzhou 510640People’s Republic of China Tianjin Key laboratory of Molecular Optoelectronic Sciences School of Materials Science and EngineeringTianjin UniversityTianjin 300350People’s Republic of China State Key laboratory of Silicon Materials MOE Key Laboratory of Macromolecular Synthesis and FunctionalizationDepartment of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027People’s Republic of China

Recently published in Joule,Feng Liu and colleagues from Shanghai Jiaotong University reported a record-breaking 20.8%power conversion efficiency in organic solar cells(OSCs)with an interpenetrating fibril network active layer morphology,featuring a bulk p-in structure and proper vertical segregation achieved through additive-assisted layer-by-layer *** optimized hierarchical gradient fibrillar morphology and optical management synergistically facilitates exciton diffusion,reduces recombination losses,and enhances light capture *** approach not only offers a solution to achieving high-efficiency devices but also demonstrates the potential for commercial applications of OSCs.

关键词： Organic solar cells Additive-assisted layer-by-layer processing Three-dimensional fibril morphology Bulk p-i-n structure Optical management

Encapsulation of superparamagnetic Fe_3O_4@SiO_2 core/shell nanoparticles in MnO_2 microflowers with high surface areas

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Chinese Chemical Letters 2015年第2期26卷 233-237页

作者： Yu-Gang Sun Tu T.Truong Yu-Zi Liu Yong-Xing Hu Center for nanoscale Materials Argonne National Laboratory

Microflowers made of interconnected MnO2 nanosheets have been successfully synthesized in a microwave reactor through a hydrothermal reduction of KMnO4 with aqueous HCI at elevated temperatures in the presence of superparamagnetic Fe3O4SiO2 core-shell *** to the chemical compatibility between SiO2 and MnO2,the heterogeneous reaction leads to the spontaneous encapsulation of the Fe3O4@SiO2 core-shell nanoparticles in the MnO2 *** resulting hybrid particles exhibit multiple properties including high surface area associated with the MnO2nanosheets and superparamagnetism originated from the Fe3O4@SiO2 core-shell *** are beneficial for applications requiring both high surface area and magnetic separation.

关键词： Microwave synthesis Manganese oxide nanosheets Superparamagnetic nanoparticles Hybrid nanostructures Multifunctional nanostructures

Effect of strain on geometric and electronic structures of graphene on a Ru(0001) surface

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Chinese Physics B 2009年第7期18卷 3008-3013页

作者：孙家涛杜世萱肖文德胡昊张余洋李果高鸿钧 nanoscale Physics and Devices laboratory Institute of PhysicsChinese Academy of Sciences

The atomic and electronic structures of a graphene monolayer on a Ru（0001） surface under compressive strain are investigated by using first-principles *** models of graphene monolayers with different carbon periodicities due to the lattice mismatch are proposed in the presence and the absence of the Ru（0001） substrate *** the strain induced by the lattice mismatch,we optimize the atomic structures and investigate the electronic properties of the *** calculation results show that the graphene layers turn into periodic corrugations and there exist strong chemical bonds in the interface between the graphene N × N superlattice and the *** strain does not induce significant changes in electronic ***,the results calculated in the local density approximation （LDA） are compared with those obtained in the generalized gradient approximation （GGA）,showing that the LDA results are more reasonable than the GGA results when only two substrate layers are used in calculation.

关键词： first-principles calculations graphene strain electronic structure

Transport properties of boron nanotubes investigated by ab initio calculation

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Chinese Physics B 2009年第6期18卷 2502-2507页

作者：郭伟胡亦斌张余洋杜世萱高鸿钧 nanoscale Physics and Devices laboratory Institute of PhysicsChinese Academy of Sciences

We investigate atomic and electronic structures of boron nanotubes （BNTs） by using the density functional theory （DFT）. The transport properties of BNTs with different diameters and chiralities are studied by the Keldysh nonequilibrium Green function （NEGF） method. It is found that the cohesive energies and conductances of BNTs decrease as their diameters decrease. It is more difficult to form （N, 0） tubes than （M, M） tubes when the diameters of the two kinds of tubes are comparable. However, the （N, 0） tubes have a higher conductance than the （M, M） tubes. When the BNTs are connected to gold electrodes, the coupling between the BNTs and the electrodes will affect the transport properties of tubes significantly.

关键词： nonequilibrium Green function transport properties boron nanotubes

Role of buffer layer in electronic structures of iron phthalocyanine molecules on Au(111)

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Chinese Physics B 2010年第9期19卷 25-30页

作者：孙家涛潘理达胡昊杜世萱高鸿钧 nanoscale Physics and Devices laboratory Institute of PhysicsChinese Academy of Sciences

We investigate the electronic structures of one and two monolayer iron phthalocyanine （FePc） molecules on Au（111） surfaces. The first monolayer FePc is lying flat on the Au（111） substrate, and the second monolayer FePc is tilted at -15° relative to the substrate plane along the nearest neighbour [101] direction with a lobe downward to the central hole of the unit cell in the first layer. The structural information obtained by first-principles calculations is in agreement with the experiment results. Furthermore, it is demonstrated that the electronic structures of FePc molecules in one-monolayer FePc/Au（111） system are perturbed significantly, while the electronic structures of FePc molecules in the second monolayer in two-monolayer FePc/Au（111） system remain almost unchanged due to the screening of the buffer layer on Au（111）.

关键词： iron phthalocyanine electronic structure calculations buffer layer

Structural transformation of Ge dimers on Ge(001) surfaces induced by bias voltage

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Chinese Physics B 2008年第12期17卷 4580-4584页

作者：秦志辉时东霞高鸿钧 nanoscale Physics & devices laboratory Institute of Physics Chinese Academy of Sciences

Scanning tunnelling microscopy is utilized to investigate the local bias voltage tunnelling dependent transformation between （2×1） and c（4×2） structures on Ge（001） surfaces, which is reversibly observed at room temperature and a critical bias voltage of -0.80 V. Similar transformation is also found on an epitaxial Ce islands but at a slightly different critical bias voltage of -1.00V. It is found that the interaction between the topmost atoms on the STM tip and the atoms of the dimers, and the pinning effect induced by Sb atoms, the nacancies or the epitaxial clusters, can drive the structural transformation at the critical bias voltage.

关键词： scanning tunnelling microscopy surface structures Ge structural transition

Ab initio calculation of the growth of Te nanorods and Bi_2Te_3 nanoplatelets

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Chinese Physics B 2008年第1期17卷 286-289页

作者：田晓庆杜世萱高鸿钧 nanoscale Physics & Devices laboratory Institute of Physics Chinese Academy of Sciences

In this paper the growth mechanism of a Te/Bi2Te3 novel structure is studied by ab-initio calculations. The results show that the growth of Te nanorods is determined by the adsorption energy of Te atoms on different crystalline Te surfaces. The adsorption energy of Te on the Te （001） surface is 3.29 eV, which is about 0.25 eV higher than that of Te on the Te （110）. This energy difference makes the preferential growth direction along the 〈 001 〉 direction. In addition, the higher surface energy of Bi2Te3 （110） and the lattice misfit between crystalline Bi2We3 and Te along 〈 001 〉 direction are considered to explain the growth of the Bi2Te3 nanoplatelets, in which Volmer-Weber model is used. The theoretical results are in agreement with experimental observation.

关键词： ab initio calculation growth mechanism Te nanorod Bi2Te3 nanoplatelet

The influence of annealing temperature on the morphology of graphene islands

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Chinese Physics B 2012年第8期21卷 532-536页

作者：黄立徐文焱阙炎德潘毅高敏潘理达郭海明王业亮杜世萱高鸿钧 nanoscale Physics and Devices laboratory Institute of PhysicsChinese Academy of Sciences

We report on temperature-programmed growth of graphene islands on Ru （0001） at annealing temperatures of 700 ℃, 800 ℃, and 900 ℃. The sizes of the islands each show a nonlinear increase with the annealing temperature. In 700 ℃ and 800 ℃annealings, the islands have nearly the same sizes and their ascending edges are embedded in the upper steps of the ruthenium substrate, which is in accordance with the etching growth mode. In 900 ℃ annealing, the islands are much larger and of lower quality, which represents the early stage of Smoluchowski ripening. A longer time annealing at 900 ℃ brings the islands to final equilibrium with an ordered moire pattern. Our work provides new details about graphene early growth stages that could facilitate the better control of such a growth to obtain graphene with ideal size and high quality.

关键词： graphene islands Ru (0001) annealing temperature scanning tunneling microscope

STM study of In nanostructures formation on Ge(001) surface at different coverages and temperatures

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Chinese Physics B 2008年第3期17卷 1055-1059页

作者：秦志辉时东霞庞世瑾高鸿钧 nanoscale Physics and Devices laboratory Institute of PhysicsChinese Academy of Sciences

Different In/Ge（001） nanostructures have been obtained by annealing the samples at 320℃ with different coverages of In. Annealing a sample with a critical coverage of 2.1 monolayer of In, different In/Ge（001） nanostructures can be obtained at different temperatures. It is found that thermal annealing treatments first make In atoms form elongated Ge{103}-faceted In-clusters, which will grow wider and longer with increasing temperature, and finally cover the surface completely.

关键词： scanning tunnelling microscopy surface structures Ge In