Instituto de Ciencia de Materiales de Madrid (@icmm-csic.bsky.social)

🔎Natural Layered Phlogopite Dielectric for Ultrathin Two-Dimensional Optoelectronics 📜New paper at ACS Nano 🤝A fruitful collaboration between #2dfoundry & #Esisna groups at ICMM pubs.acs.org/doi/10.1021/...

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Natural Layered Phlogopite Dielectric for Ultrathin Two-Dimensional Optoelectronics The integration of high-dielectric-constant (high-κ) materials with two-dimensional (2D) semiconductors is promising to overcome performance limitations and reach their full theoretical potential. Here, we show that naturally occurring phlogopite mica, exfoliated into ultrathin flakes, can serve as a robust high-κ dielectric layer for transition metal dichalcogenide-based 2D electronics and optoelectronics. The wide band gap (∼4.8 eV), high dielectric constant (∼11), and large breakdown field (>10 MV cm–1) of phlogopite enable transistors with subthreshold swings down to 100 mV dec–1, minimal hysteresis (∼30–60 mV), and interface trap densities comparable to those of state-of-the-art oxide dielectrics. Moreover, phototransistors built upon monolayer molybdenum disulfide (MoS2) and phlogopite exhibit responsivities up to 3.3 × 104 AW–1 and detectivities close to 1010 Jones, surpassing devices based on conventional gate insulators. We further demonstrate the versatility of this natural dielectric by integrating phlogopite/MoS2 heterostructures into NMOS inverters, showcasing robust voltage gains and low-voltage operation. Our findings establish phlogopite as a promising, earth-abundant dielectric for next-generation 2D transistor technologies and high-performance photodetection. https://pubs.acs.org/doi/10.1021/acsnano.5c09046