Structural, mechanical, electronic and optical properties of biphenylene hydrogenation: a first-principles study

• Published in: Physical chemistry chemical physics : PCCP 2023-09, Vol.25 (36), p.24797-2488
• Main Authors: Chen, Kai, Zhou, Jian, Zhao, Wuyan, Yang, Riyi, Qiao, Chong, Su, Wan-Sheng, Zheng, Yuxiang, Zhang, Rongjun, Chen, Liangyao, Wang, Songyou
• Format: Article
• Language: English
• Subjects: Configurations; Elastic properties; Electronic properties; Energy gap; First principles; Hydrogen atoms; Hydrogenation; Mathematical analysis; Mechanical properties; Optical properties; Optoelectronic devices; Poisson's ratio
• ISSN: 1463-9076; 1463-9084
• DOI: 10.1039/d3cp03052k

Biphenylene networks typically exhibit a metallic electronic nature, while hydrogenation can open the band gap changing it to a semiconductor. This property makes hydrogenated biphenylene a promising candidate for use in semiconductor optoelectronic materials and devices. In this work, three representative configurations of hydrogenated biphenylene, denoted by α , β and γ , were investigated. The structural, mechanical, electronic, and optical properties of these hydrogenated biphenylene configurations were calculated by first-principles calculations. Band gaps with HSE correction were 4.69, 4.42 and 4.39 eV for α , β , and γ configurations, respectively. Among these three configurations, β presents the best electronic performance and special elastic properties (negative Poisson's ratio), while γ exhibits the best elastic properties. In addition, we comprehensively analyze the mechanical properties of these configurations and provide evidence that hydrogenated biphenylene possibly exhibits a negative-Poisson's-ratio along the zigzag and armchair directions when hydrogen atoms are added to biphenylene in certain ways. Furthermore, although the electronic properties of γ are weaker than those of β , they are also excellent. In addition, the binding energies of β and γ are relatively lower, which indicates that β and γ are more stable. Our findings demonstrate that the hydrogenated biphenylene is a promising material with significant application potential in optoelectronic devices. Biphenylene networks typically exhibit a metallic electronic nature, while hydrogenation can open the band gap changing it to a semiconductor.