Uncovering the distinctive phase transition characteristics and thermochromic performance of VO2 with different N-doping sites

• DOI: 10.1016/j.apsusc.2024.159779
• Publication Date: 2024-02-27T04:03:16Z
• Authors: Yibei Xue; Lei Miao; Takuya Hasegawa; Ayahisa Okawa; Shunya Yoshino; Hideki Kato; Masato Kakihana; Shu Yin

Nitrogen is a rare dopant that can not only enter the interstitial sites (Ni) but also oxygen substitutional (Ns) of vanadium dioxide (VO2). The incorporation N atom has been demonstrated to modulate phase transition behavior VO2. However, deep understanding effect doping on and thermochromic properties VO2 remains lacking. Here, we prepare N-doped with tunable sites. Ni demonstrates ability slightly increase transformation temperature (Tc), while greatly improving visible light transmittance near-infrared (NIR) modulation performance by 5 % 44 %, respectively. Interestingly, introduction Ns reduces Tc double (interstitial O substitution sites, Ni,s), from 65.2 60.6 °C. More attractively, thermal hysteresis width reduced near zero (0.2 °C). This great interest for precise regulation transition. These distinctions are attributed differences in effects N-doping lattice energy band structure injects hole carriers into d// raising valence maximum thus narrowing gap. point defect-induced nucleation mechanism supports narrow combination vacancies impurities.