Epoxy/BaTiO3 (SrTiO3) Composite Films and Pastes For High Dielectric Constant and Low Tolerance Embedded Capacitors in Organic Substrates

摘要: Epoxy/BaTiO3 composite embedded capacitor films (ECFs) were newly designed for high dielectric constant and low tolerance (less than plusmn5%) fabrication organic substrates. In terms of material formulation, ECFs are composed specially formulated epoxy resin latent curing agent, in coating process, a comma roll method is used uniform film thickness large area. Dielectric properties BaTiO3 (BT) & SrTiO3 (ST) ECF measured MIM capacitors with oxygen plasma etched on 10times10 cm PCBs. For 1times1 mm 12 um 50 vol.%BTO ECFs, 39, loss 0.017, capacitance density 2.4 nF/cm2, less 10% obtained. BTOECF bigger that STECF, it due to difference permittivity BT particles. ST frequency range (0.5~10 GHz) using cavity resonance method. order estimate constants at frequency, the reflection coefficient network analyzer. calculated by observing frequencies resonant modes. Although there was no relaxation observed pure epoxy, ECF, 5~9GHz. It mainly changing polarization mode powder itself. contrast, up 10 GHz. Alternative epoxy/BT pastes (ECPs). uses similar materials formulation like screen printing coating. The has advantage forming partially desired But makes surface irregularity during mask peel-off. Surface flatness significantly improved adding some additives applying pressure curing. As result, layer uniformity successfully demonstrated. 4times4 11 vol.% 0.023, of2.6nF/cm2, 22% obtained