Degradation of pMOSFETs due to hot electron induced punchthrough. (April 2016)

• Record Type: Journal Article
• Authors: Son, Donghee; Kim, Gang-Jun; Seo, Ji-Hoon; Lee, Nam-Hyun; Kang, YongHa; Kang, Bongkoo
• Is Part Of: Microelectronics and reliability. Volume 59(2016)
• Page Start: 13
• Page End: 17
• Publication Date: 2016-04
• Subjects: Hot electron induced punchthrough (HEIP) -- Parasitic MOSFET -- Shallow trench isolation (STI) -- Hot electron trap; Electronic apparatus and appliances -- Reliability -- Periodicals; Miniature electronic equipment -- Periodicals; Appareils électroniques -- Fiabilité -- Périodiques; Équipement électronique miniaturisé -- Périodiques; Electronic apparatus and appliances -- Reliability; Miniature electronic equipment; Periodicals; 621.3815
• DOI: 10.1016/j.microrel.2016.01.003
• Languages: English
• ISSNs: 0026-2714

Abstract

Abstract: This paper proposes a method which can separate the parasitic effect from the drain current I d vs. gate voltage V g curves of MOSFETs, then uses this method to analyze degradation of experimental pMOSFETs due to hot-electron-induced punchthrough (HEIP). An I d vs. V g curve of the parasitic MOSFET formed by a shallow trench isolation (STI) is obtained by extrapolating the line of I d vs. channel width W at each V g to W = 0 μm. The I d vs. V g curves of the parasitic MOSFET indicate that HEIP caused electron trapping at the interface between SiN and the sidewall oxide of STI, but the curves of the main MOSFET indicate that HEIP caused negative oxide charges and positive interface traps in the channel region. These charges and traps decreased the threshold voltage V th of the parasitic MOSFET but increased V th of the main MOSFET. These two opposite behaviors of V th resulted in little HEIP-induced shift of V th at W = 2.5 μm. | V d | to secure ten-year HEIP lifetime of 10% shift of V th was ≤ 2.2 V at W = 0.3 μm, ≤ 3.5 V at W = 1.0 μm, and ≤ 3.6 V at W = 10 μm; these changes indicate that degradation of parasitic MOSFET influences the HEIP lifetime of narrow pMOSFET significantly. Graphical abstract: Highlights: Method to extract drain current of parasitic and main MOSFET was proposed. Using the proposed method, degradation of parasitic and main MOSFET was analyzed. Width dependency of HEIP on pMOSFETs was evaluated. Degradation of parasitic MOSFET influences the HEIP lifetime of narrow pMOSFETs significantly.