Fully Printed Multilayer Ceramic Capacitors Based on High‐k Perovskite Nanosheets

• Published in: Small (Weinheim an der Bergstrasse, Germany) Vol. 20; no. 44; pp. e2404581 - n/a
• Main Authors: Zhang, Pengxiang, Dang, Feng, Zhang, Xin, Nan, Ce‐Wen, Li, Bao‐Wen
• Format: Journal Article
• Language: English
• Published: Germany Wiley Subscription Services, Inc 01.11.2024
• Subjects: Capacitance; Capacitors; Ceramics; dielectric enhancement; Graphene; Heat treatment; Heterojunctions; high‐k perovskite nanosheets; Inkjet printing; Interlayers; multilayer ceramic capacitor; Multilayers; Nanosheets; Parameter modification; Perovskites; Silver; Structural design; Structural stability; Substrates; Thermal stability; Two dimensional materials; inkjet printing; multilayer ceramic capacitor; high‐k perovskite nanosheets; dielectric enhancement
• ISSN: 1613-6810; 1613-6829; 1613-6829
• DOI: 10.1002/smll.202404581

Printing technology enables the integration of chemically exfoliated perovskite nanosheets into high‐performance microcapacitors. Theoretically, the capacitance value can be further enhanced by designing and constructing multilayer structures without increasing the device size. Yet, issues such as interlayer penetration in multilayer heterojunctions constructed using inkjet printing technology further limit the realization of this potential. Herein, a series of multilayer configurations, including Ag/(Ca2NaNb4O13/Ag)n and graphene/(Ca2NaNb4O13/graphene)n (n = 1–3), are successfully inkjet‐printed onto diverse rigid and flexible substrates through optimized ink formulations, inkjet printing parameters, thermal treatment conditions, and rational multilayer structural design using high‐k perovskite nanosheets, graphene nanosheets and silver. The dielectric performance is optimized by fine‐tuning the number of dielectric layers and modifying the electrode/dielectric interface. As a result, the graphene/(Ca2NaNb4O13/graphene)3 multilayer ceramic capacitors exhibit a remarkable capacitance density of 346 ± 12 nF cm−2 and a high dielectric constant of 193 ± 18. Additionally, these devices demonstrate moderate insulation properties, flexibility, thermal stability, and chemical sensitivity. This work shed light on the potential of multilayer structural design in additive manufacturing of high‐performance 2D material‐based ceramic capacitors. All‐printed multilayer ceramic capacitors made of high‐k Ca2NaNb4O13 perovskite nanosheets with different electrodes are prepared by inkjet printing. The dielectric constant of multilayer ceramic capacitors with graphene electrodes is ≈4 times higher than that of silver electrodes. These inkjet‐printed multilayer ceramic capacitors exhibit a large capacitance density of ≈346 nF cm−2, a high dielectric constant of up to 193, excellent flexibility, and thermal stability.