Crystallinity modulation originates ferroelectricity like nature in piezoelectric selenium. (May 2022)

• Record Type: Journal Article
• Authors: Alluri, Nagamalleswara Rao; Maria Joseph Raj, Nirmal Prashanth; Khandelwal, Gaurav; Panda, Pritam Kumar; Banerjee, Amitava; Mishra, Yogendra Kumar; Ahuja, Rajeev; Kim, Sang-Jae
• Is Part Of: Nano energy. Volume 95(2022)
• Publication Date: 2022-05
• Subjects: Selenium -- Piezoelectricity -- Ferroelectricity -- Crystal imperfections -- Single crystalline microrod -- Raman mapping; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2022.107008
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: Modern room temperature ferroelectrics/piezoelectrics significantly impact advanced nanoelectronics than conventional chemical compounds. Changes in crystallinity modulation, long-range order of atoms in metalloids permits the design of novel materials. The ferroelectric like nature of a single element (selenium, Se) is demonstrated via in-plane (E⊥ ar to the Se helical chains in micro-rod (MR)) and out-of-plane (E ∥ el to the Se helical chains in MR) polarization. Atomic electron microscopy shows large stacks of covalently bound Se atoms in a c-axis orientation for tip bias voltage-dependent switchable domains with a 180˚ phase and butterfly displacement curves. The single crystalline Se MR has a high in-plane piezoelectric coefficient of 30 pm/V relative to polycrystalline samples due to larger grains, crystal imperfections in MR, and tuned helical chains. The energy conversion of a single Se-MR demonstrated via d13, d12 (or d15 ) piezoelectric modes. Graphical Abstract: ga1 Highlights: Multiple aspect ratios of anisotropic t-Se-MRs were prepared by an eco-friendly SG process. Strength of ferroelectricity, piezoelectricity explored based on crystallinity, helical chain order. Observed in-plane dij value (pm/V): Single Se MR (30)>POP Se-pellet (13)>HDP Se pellet (7). Slip movements, twinning is origin for out-of-plane ferroelectricity/piezoelectricity. Energy conversion of a single Se-MR demonstrated via d13, d12 (or d15 ) piezoelectric modes.