Vapor growth induced CNT/CsPbCl3 heterojunction construction: interface-dominated remarkable field emission and stability

Synergistic interaction between vapor-deposited CsPbCl 3 perovskite and CNT optimizes field emission and long-term stability. • The work function of CNT is reduced to 4.28 eV, significantly enhancing electron tunneling efficiency. • CsPbCl 3 suppresses current concentration at the CNT, ensuring the integrity and stability of the emission structure. • The introduction of additional emission sites significantly increases the field emission current to 50 mA. In the field of vacuum microelectronics, carbon nanotube (CNT) used as field emission cathode faces many challenges, including high driving electric field and poor stability of CNT tips. As a result, relying solely on CNT is insufficient to meet the application requirements of high-performance cold cathode. In this study, we introduced CsPbCl 3 perovskite and utilized its excellent intrinsic optoelectronic properties in conjunction with CNT for field emission. CsPbCl 3 was grown on the surface of CNT film through continuous vapor deposition to form CNT/CsPbCl 3 heterojunction. This heterojunction offers three synergistic advantages, it effectively reduces the work function of CNT, introduces additional electron emission sites and provides physical protection for the CNT. Experimental results show that HF60 sample exhibits significantly improved field emission performance, with the turn-on field and threshold field of 2.11 V/μm and 2.35 V/μm respectively, the field enhancement factor reaching 5897 and the maximum emission current exceeds 50 mA. Simultaneously, the current fluctuation rate was only 4% in 10 h lifespan test, demonstrating reliable long-term stability. Furthermore, we employed DFT calculations to deeply analyze the interface electron regulation mechanisms of the CNT/CsPbCl 3 heterojunction, providing a theoretical explanation for the enhanced field emission performance. This study offers a novel and effective technology approach for the fabrication of high-performance field emission cathode. Download: Download high-res image (381KB) Download: Download full-size image