Jiang Y.-SJeng Y.-EYin Y.-THuang K.-WChang T.-JWang C.-IChao Y.-TCHAO-HSIN WUMIIN-JANG CHEN2021-08-052021-08-05202120507534https://www.scopus.com/inward/record.uri?eid=2-s2.0-85100511640&doi=10.1039%2fd0tc04025h&partnerID=40&md5=739901b4ec328ec7b7c08ca15985b83chttps://scholars.lib.ntu.edu.tw/handle/123456789/576935The ferroelectric (FE) negative capacitance (NC) has emerged as a potential candidate for low-power electronics. In this study, we experimentally demonstrate the capacitance magnification of a paraelectric (PE) HfO2capacitance (CHfO2) connected in series with a FE ZrO2capacitance (CZrO2), which is higher than the value predicted by the series capacitance formula (CZrO2?1+CHfO2?1)?1and has a capacitance magnification ratio in the range 1.79-2.24. A model based on the switching of the net polarization in FE multi-domains is proposed to explain the capacitance magnification. In addition, the operation bandwidth of the NC effect was investigated by the frequency response of the capacitance magnification from 1 kHz to 10 GHz for the first time. The result reveals vanishing of the capacitance magnification at a frequency of about tens of megahertz, which suggests that the operation speed of NC is below ?100 MHz. ? The Royal Society of Chemistry 2021.Bandwidth; Ferroelectricity; Frequency response; Hafnium compounds; Zirconium compounds; Model-based OPC; Multi domains; Negative capacitance; Operation bandwidth; Operation speed; Paraelectrics; Series capacitance; Capacitancejournal article10.1039/d0tc04025h2-s2.0-85100511640