<br>大面积单层 Cu3BHT 2D 共轭配位聚合物的电学表征,Advanced Functional Materials

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大面积单层 Cu3BHT 2D 共轭配位聚合物的电学表征
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2024-11-06 , DOI: 10.1002/adfm.202416717
Sandra M. Estévez _{1,

2} , Zhiyong Wang _{3,

4} , Tsai‐Jung Liu ₄ , Gabriel Caballero _{1,

5} , Fernando J. Urbanos ₁ , Ignacio Figueruelo‐Campanero _{1,

5} , Julia García‐Pérez ₁ , Cristina Navío ₁ , Miroslav Polozij _{4,

6,

7} , Jianjun Zhang ₄ , Thomas Heine _{4,

6,

7,

8} , Mariela Menghini ₁ , Daniel Granados ₁ , Xiliang Feng _{3,

4} , Renhao Dong _{9,

10} , Enrique Cánovas ₁

Affiliation

IMDEA Nanociencia Madrid 28049 Spain
Escuela de Doctorado Universidad Autónoma de Madrid Madrid 28049 Spain
Max Planck Institute of Microstructure Physics 06120 Halle(Saale) Germany
Center for Advancing Electronics Dresden (cfaed) & Faculty of Chemistry and Food Chemistry Technische Universität Dresden 01062 Dresden Germany
Facultad Ciencias Físicas Universidad Complutense de Madrid Madrid 28040 Spain
Helmholtz‐Zentrum Dresden‐Rossendorf (HZDR) Abteiling Ressoursenökilogie 04318 Leipzig Germany
Center for Advanced Systems Understanding CASUS Untermarkt 20 02826 Görlitz Germany
Department of Chemistry Yonsei University Seodaemun‐gu Seoul 120‐749 Republic of Korea
Key Laboratory of Colloid and Interface Chemistry of the Ministry of Education, School of Chemistry and Chemical Engineering Shandong University Jinan 250199 China
Materials Innovation Institute for Life Sciences and Energy (MILES) & Department of Chemistry University of Hong Kong Pokfulam Road, Hong Kong Island Hong Kong China

了解大面积单层 2D 材料的电荷传输特性对于新型光电器件的未来发展至关重要。本工作报道了大面积单层 Cu ₃ BHT 2D 共轭配位聚合物的合成和电学表征。Cu ₃ BHT 是通过 Langmuir-Blodgett 方法在水面上合成的，然后转移到具有预先图案化电触点的 SiO ₂ /Si 衬底上。电气测量显示，在高达 ≈1 cm ² 的区域内具有欧姆响应，在探针间距为 50 μm 时，平均电阻约为 53 ± 3 kΩ。冷却和加热循环显示电响应滞后，表明当样品在温度扫描期间发生结构化学变化时，会形成不同的电流路径。这种滞后在几个循环后消失，电导率显示出稳定的指数行为作为温度的函数，表明温度依赖性的隧穿过程正在控制所分析的多晶单层 Cu ₃ BHT 样品中的传导机制。这些结果，连同密度泛函理论计算和价带 X 射线光电子能谱数据表明，单层样品表现出半导体行为而不是金属行为。

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Electrical Characterization of a Large-Area Single-Layer Cu3BHT 2D Conjugated Coordination Polymer

Understanding charge transport properties of large-area single-layer 2D materials is crucial for the future development of novel optoelectronic devices. In this work, the synthesis and electrical characterization of large-area single-layers of Cu₃BHT 2D conjugated coordination polymers are reported. The Cu₃BHT are synthesized on the water surface by the Langmuir-Blodgett method and then transferred to SiO₂/Si substrates with pre-patterned electrical contacts. Electrical measurements revealed ohmic responses across areas up to ≈1 cm², with a mean resistance of approximately 53 ± 3 kΩ at a probe separation of 50 µm. Cooling and heating cycles show hysteresis in the electrical response, suggesting different current pathways are formed as the samples underwent structural-chemical changes during temperature sweeps. This hysteresis vanished after several cycles and the conductivity shows a stable exponential behavior as a function of temperature, suggesting that a temperature-dependent tunneling process is governing the conduction mechanism in the analyzed polycrystalline single-layer Cu₃BHT samples. These results, together with density functional theory calculations and valence band X-ray photoelectron spectroscopy data suggest that the single-layer samples exhibit a semiconducting rather than a metallic behavior.

更新日期：2024-11-06

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