A Study of Dielectric Relaxation and Capacitance Matching of Al2O3/HfO2/Al2O3 MIM Capacitors

作者：Han In Shik; Kwon Hyuk Min; Kwon Sung Kyu; Choi Woon Il; Lim Su; Kim Jin Soo; Kim Moon Ho; Ha Man Lyun; Lee Ju Il; Lee Hi Deok^*

来源：IEEE Electron Device Letters, 2013, 34(10): 1223-1225.

DOI：10.1109/LED.2013.2279220

• Analog/mixed signal
• dielectric relaxation
• electrical performance
• floating gate
• matching
• metal-insulator-metal (MIM) capacitor

Key analog characteristics such as dielectric relaxation and capacitance matching for Al2O3/HfO2/Al2O3 (AHA) metal-insulator-metal (MIM) capacitors were analyzed for high-performance analog circuit applications. Although the dc characteristics of AHA MIM capacitor were acceptable for analog operation, the variation of the quadratic voltage coefficient (alpha) under constant voltage stress (CVS) and the dielectric relaxation remained problematic. The dependence of alpha for AHA MIM capacitor decreased gradually under CVS and the dielectric relaxation of AHA MIM capacitor was greater than that of conventional MIM capacitor, which was due to the effect of preexisted traps in high-k dielectric. The extracted matching coefficient of AHA MIM capacitor was, however, 0.698% mu m, which was low enough to be used for analog/mixed signal/radio frequency application.

• 出版日期2013-10