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surface passivation of Nanocrystalline Silicon Powder Derived from Cryomilling

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Journal of Wuhan University of Technology(Materials Science) 2014年第1期29卷 65-69页

作者：王志浩 HUANG Zhifeng 陈斐 SHEN Qiang ZHANG Lianmeng State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Key Laboratory of Advanced Technology for Specially Functional Materials Ministry of Education Wuhan University of Technology

The surface passivation mechanism of nanocrystalline silicon powder was studied. The liquid nitrogen/argon was used as the medium to prepare the nanocrystalline silicon powder, using a cryomilling technology. The X-ray diffraction, transmission electron microscopy, plasma emission spectroscopy and infrared spectrum were used to analyze the prepared samples, and density functional theory was used to investigate the cryomilling process. For nanocrystalline silicon powder cryomilled with liquid N2, the amorphous outer layer with N element is formed On the surface, and chemisorption caused by the formation of Si-N-Si bond leads to the surface passivation; although physisorpfion also he confirmed, the Si-N bond is steady after exploded in air for 30 days and no new bond is observed. For nanocrystalline silicon powder cryomilled with liquid At, no new chemical bond is Observed, Ar element absorbs on the surface of the prepared powder only through physisorption, and after exploded in air for 30 days, a Si-O bond can be observed obviously.

关键词： surface passivation nanocrystalline silicon powder cryomilling

Design and roles of RGO-wrapping in charge transfer and surface passivation in photoelectrochemical enhancement of cascade-band photoanode

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Nano Research 2017年第7期10卷 2415-2430页

作者： Zhuo Zhang Mingi Choi Minki Baek Insung Hwang Changshin Cho Zexiang Deng Jinwoo Lee Kijung Yong surface Chemistry Laboratory of Electronic Materials Department of Chemical Engineering POSTECH Pohang 790-784 Republic of Korea Advanced Functional Nanomaterial Laboratory Department of Chemical Engineering POSTECH Pohang 790-784 Repubfic of Korea State Key Laboratory of Optoelectronic Materials and Technologies School of Physics and Engineering Sun Yat-Sen University Guangzhou 510275 China

Fast charge transfer and anti-photocorrosion are two crucial factors for developing efficient, durable photoanodes for photoelectrochemical （PEC） cells. Reduced graphene oxide （RGO） is a promising photoanode element that can provide both of these. In this study, we elucidated the roles of RGO in the charge transfer and surface passivation of photoanodes by the precise design of a RGO-wrapped photoanode and examination of its PEC properties. Arrays of hetero-nanorods （HNRs） with three different designs were fabricated as photoanodes using RGO, CdSe nanoparticles （NPs）, and ZnO nanorods （NRs） as building blocks. CdSe@ZnO HNRs were prepared by decorating ZnO NRs with CdSe NPs. Finite-element analysis and experimental studies demonstrated that in the CdSe@ZnO HNRs, if only the ZnO NRs were wrapped by RGO, the conductivity between CdSe and ZnO was enhanced by RGO to shuttle charges. If RGO only surrounded the outside of the CdSe@ZnO HNRs, the corrosion was slowed owing to the passivation effect of RGO, which increased the electron lifetime of the photoanode. If both CdSe and ZnO were fully wrapped by RGO, the advantages of the two aforementioned cases were both obtained. RGO-wrapped CdSe@ZnO HNRs with position-controlled designs are promising photoanode materials with a high PEC efficiency, and the developed synthesis process can be applied to explore the design and fabrication of next-generation photoanodes using RGO as a buildin~ block.

关键词： photoelectrochemical reduced graphene oxide(RGO) charge transfer surface passivation CdSe ZnO

Enhanced efficiency and stability in Sn-based perovskite solar cells by trimethylsilyl halide surface passivation

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Journal of Energy Chemistry 2022年第8期31卷 604-611,I0016页

作者： Zheng Zhang Liang Wang Ajay Kumar Baranwal Shahrir Razey Sahamir Gaurav Kapil Yoshitaka Sanehira Muhammad Akmal Kamarudin Kohei Nishimura Chao Ding Dong Liu Yusheng Li Hua Li Mengmeng Chen Qing Shen Teresa SRipolles Juan Bisquert Shuzi Hayase Graduate School of Informatics and Engineering University of Electro-Communication1-5-1 ChofugaokaChofuTokyo 182-8585Japan Escuela Técnica Superior de Ingeniería de Telecomunicación Universidad Rey Juan CarlosMadrid 28933Spain Institute of Advanced Materials(INAM) Universitat Jaume ICastelló12006Spain

Lead free tin perovskite solar cells(PKSCs)are the most suitable alternative candidate for conventional lead perovskite solar ***,the efficiency and the stability are insufficient,mainly because of the poor film quality and numerous *** we introduce an efficient strategy based on a simple trimethylsilyl halide surface passivation to increase the film quality and reduce the defect *** the same time,a hydrophobic protective layer on the perovskite surface is formed,which enhanced the PKSCs’*** efficiency of the solar cell after the passivation was enhanced from 10.05%to 12.22%with the improved open-circuit voltage from 0.57 V to 0.70 *** addition,after 92 days of storage in N_(2) filled glovebox,the modified T-PKSCs demonstrated high stability maintaining 80%of its initial *** work provides a simple and widely used strategy to optimize the surface/interface optoelectronic properties of perovskites for giving more efficient and stable solar cells and other optoelectronic devices.

关键词： Tin halide perovskite Trimethylsilyl halide surface passivation Stability

Organic ligand nanoarchitectonics for BiVO_(4) photoanodes surface passivation and cocatalyst grafting

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Nano Research 2024年第5期17卷 3667-3674页

作者： Jingyi Lin Xin Li Zhiliang Wang Runlu Liu Hui Pan Yixin Zhao Lingti Kong Yao Li Shenmin Zhu Lianzhou Wang State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Nanomaterials Centre School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnologythe University of QueenslandQLD 4072Australia School of Environmental Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China Hubei Key Laboratory of Plasma Chemistry and Advanced Materials Wuhan Institute of TechnologyWuhan 430205China

Bismuth vanadate(BiVO_(4))is a promising photoanode material for efficient photoelectrochemical(PEC)water splitting,whereas its performance is inhibited by detrimental surface *** solve the problem,herein,a low-cost organic molecule 1,3,5-benzenetricarboxylic acid(BTC)is selected for surface passivation of BiVO_(4) photoanodes(BVOs),which also provides bonding sites for Co^(2+)to anchor,resulting in a Co-BTC-BVO *** to its strong coordination with metal ions,BTC not only passivates surface states of BVO,but also provides bonding between BVO and catalytic active sites(Co^(2+))to form a molecular *** study and interfacial charge kinetic investigation reveal that chemical bonding formed at the interface greatly suppresses charge recombination and accelerates charge *** obtained Co-BTC-BVO photoanode exhibits a photocurrent density of 4.82 mA/cm^(2) at 1.23 V *** hydrogen electrode(RHE)and a low onset potential of 0.22 VRHE under AM 1.5 G illumination,which ranks among the best photoanodes coupled with Co-based *** work presents a novel selection of passivation layers and emphasizes the significance of interfacial chemical bonding for the construction of efficient photoanodes.

关键词： bismuth vanadate photoanode water splitting surface passivation bridging ligands

Efficiency enhancement of Cs_(0.1)(CH_(3)NH_(3))_(0.9)PbI_(3) perovskite solar cell by surface passivation using iso-butyl ammonium iodide

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International Journal of Minerals,Metallurgy and Materials 2022年第11期29卷 1963-1970页

作者： Wakul Bumrungsan Kritsada Hongsith Vasan Yarangsi Pisith Kumnorkeaw Sukrit Sucharitakul Surachet Phaduangdhitidhada Supab Choopun Research Center in Physics and Astronomy Department of Physics and Materials Science Faculty of ScienceChiang Mai UniversityChiang Mai 50200Thailand Thailand Center Excellence in Physics Ministry of Higher EducationScienceResearch and InnovationBangkok 10400Thailand National Nanotechnology Center National Science and Technology Development AgencyPathum Thani 12120Thailand

Efficiency enhancement of Cs_(0.1)(CH_(3)NH_(3))_(0.9)PbI_(3) solar cell devices was performed by using iso-butyl ammonium iodide(IBA)passivated on Cs_(0.1)(CH_(3)NH_(3))_(0.9)PbI_(3) *** n-i-p structure of perovskite solar cell devices was fabricated with the structure of FTO/SnO_(2)/Cs_(0.1)(CH_(3)NH_(3))_(0.9)PbI_(3)(FTO,i.e.,fluorine doped tin oxide)and IBA/Spiro-OMeTAD/*** effect of different weights of IBA passivated on Cs-doped perovskite solar cells(PSCs)was systematically investigated and compared with non-passivated *** was found that the 5-mg IBA-passivated devices exhibited a high power conversion efficiency(PCE)of 15.49%higher than 12.64%of non-IBA-passivated *** improvement of photovoltaic parameters of the 5-mg IBA-passivated device can be clearly observed compared to the Cs-doped *** better performance of the IBA-passivated device can be confirmed by the reduction of PbI_(2) phase in the crystal structure,lower charge recombination rate,lower charge transfer resistance,and improved contact angle of perovskite ***,IBA passivation on Cs_(0.1)(CH_(3)NH)_(0.9)PbI_(3) is a promising technique to improve the efficiency of Cs-doped perovskite solar cells.

关键词： perovskite solar cell power conversion efficiency surface passivation cesium methylammonium lead iodide iso-butyl ammoni-um iodide

Structure descriptor for surface passivation in the simulation of atomistic models

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Science China(Information Sciences) 2017年第3期60卷 68-77页

作者： Li CAO Siukong KOO Jian SUN Guanhua CHEN Wenping WANG Department of Computer Science The University of Hong Kong Department of Chemistry The University of Hong Kong

surface passivation is an essential step for atomistic simulations. There can be many possible surface passivation results for a given device model, such as semiconductor devices that consist of Si, Ga As, or other materials because the bonding directions of the surface atoms may not be unique. Based on the structure analysis of the given model, a generation method with structure descriptor(SDG) is proposed for surface *** with other existing solutions, the SDG method not only provides trimmer results, but also reduces the torsion angle energy of the model, which is preferred in the simulation of atomistic models. The efficiency of this method was validated through test results from several applications.

关键词： computer aided design structure analysis torsion angle universal force field surface passivation atomistic model

Recent Progress of surface passivation Molecules for Perovskite Solar Cell Applications

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Journal of Renewable Materials 2023年第4期11卷 1533-1554页

作者： Baohua Zhao Teng Zhang Wenwen Liu Fansong Meng Chengben Liu Nuo Chen Zhi Li Zhaobin Liu Xiyou Li College of Chemistry and Chemical Engineering China University of Petroleum(East China)Qingdao266580China School of Materials Science and Engineering China University of Petroleum(East China)Qingdao266580China Shandong Energy Group Co. Ltd.Jinan250000China

Due to the solution processable nature,the prepared perovskite films are polycrystalline with considerable number of *** defects,especially defects at interface accelerate the carrier recombination and reduce the carrier ***,the surface defects also affect the long-term stability of the perovskite solar cells(PVSCs).To solve this problem,surface passivation molecules are introduced at selective interface(the interface between perovskite and carrier selective layer).This review summarizes recent progress of small molecules used in ***,different types of defect states in perovskite films are introduced and their effects on device performance are ***,surface passivation molecules are divided into four categories,and the interaction between the functional groups of the surface passivation molecules and selective defect states in perovskite films are ***,we look into the prospects and challenges in design noble small molecules for PVSCs applications.

关键词： Perovskite solar cells defect surface passivation small molecules

ZnO surface passivation with Glucose Enables Simultaneously Improving Efficiency and Stability of Inverted Polymer:Non-fullerene Solar Cells

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Chinese Journal of Polymer Science 2022年第12期40卷 1594-1603,I0007页

作者： Bo-Wen Liu Ze-Rui Li Ling-Peng Yan Jing-Bo Guo Qun Luo Chang-Qi Ma School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026China i-Lab&Printable Electronics Research Center Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China

The power conversion efficiency(PCE)of polymer solar cells(PSCs)has exceeded 19%due to the rapid progress of photoactive organic materials,including conjugated polymer donors and the matched non-fullerene acceptors(NFAs).Due to the high density of oxygen vacancies and the consequent photocatalytic reactivity of ZnO,structure inverted polymer solar cells with the ZnO electron transport layer(ETL)usually suffer poor device *** this work,the eco-friendly glucose(Glu)is found to simultaneously improve the efficiency and stability of polymer:NFA solar *** the optimal conditions,we achieved improved PCEs from 14.77%to 15.86%for the PM6:Y6 solar *** a PCE improvement was attributed to the improvement in J_(SC) and FF,which is ascribed to the smoother and more hydrophobic surface of the ZnO/Glu surface,thereby enhancing the charge extraction efficiency and inhibiting charge ***,UV-Vis absorption spectra analysis revealed that glucose modification could significantly inhibit the photodegradation of Y6,resulting in a significant improvement in the stability of the device with 92%of its initial PCE after aging for 1250 *** application of natural interface materials in this work brings hope for the commercial application of organic solar cells and provides new ideas for developing new interface materials.

关键词： Polymer solar cells Glucose surface passivation Charge injection Stability improvement

Highly Stable CsPbBr_(3) Nanocrystal Phosphors by surface passivation and Encapsulation

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Chemical Research in Chinese Universities 2022年第2期38卷 588-595页

作者： SHANG Zheliang XUE Weinan WANG Wei LI Yan Shanghai Key Laboratory of Functional Materials Chemistry Institute of Applied ChemistrySchool of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237P.R.China

The colloidal all-inorganic CsPbX_(3)(X=I, Br, Cl) perovskite nanocrystals(NCs) with unique optical properties have attracted considerable attention in the field of semiconductor nanocrystals, but their application is hindered by stability issues caused by surface defects and environmental factors. Usually with inert layer encapsulation, the stability of CsPbX_(3) NCs can be significantly enhanced. However, due to the loss of highly dynamic oleic acid/oleylamine ligands, it is usually accompanied by a decrease in the photoluminescence quantum yield(PLQY). Herein, we report a facile method for preparing CsPbBr_(3) NCs based green phosphors with high stability and bright emission. With modification of colloidal CsPbBr_(3) NCs by di-dodecyldimethylammonium bromide and sequent encapsulation in the as-synthesized mesoporous MOF-5, the green emitting phosphors with enhanced stability and a PLQY of 77% were obtained. The phosphors exhibit enhanced resistance against ambient oxygen, UV light, heat treatment and water. These excellent properties show the potential value of our prepared NCs as stable phosphors in light-emitting devices.

关键词： Perovskite nanocrystal Phosphor surface passivation Encapsulation Mesoporous MOF-5