광대역 갭 반도체: 전기차, 자외선 및 무선 통신을 혁신하다

반도체 응용 분야는 밀리와트 단위의 모바일 충전기부터 기가와트 단위의 산업용 시스템, 고정밀 센서부터 첨단 광전자 소자에 이르기까지 매우 광범위합니다. 수십 년 동안 실리콘(Si)은 반도체 기술의 초석으로서 산업 전반에 걸쳐 수많은 혁신을 가능하게 했습니다. 그러나 여러 응용 분야에서 성능 요구 사항이 높아짐에 따라, 비교적 좁은 밴드갭과 제한적인 열 처리 능력 등 실리콘의 근본적인 소재 특성이 고전압, 고온 및 고전력 응용 분야에서 한계 요인이 되고 있습니다.

그 해결책은 와이드 밴드갭(WBG) 및 울트라 와이드 밴드갭(UWBG) 반도체에 있습니다. 이러한 첨단 소재는 실리콘에 비해 가전자대와 전도대 사이의 에너지 간격이 더 넓어 우수한 성능 특성을 발휘합니다. 이는 까다롭고 가혹한 환경 전반에 걸쳐 수많은 성능 이점을 제공합니다.

와이드 밴드갭 및 울트라 와이드 밴드갭 반도체란 무엇인가?

와이드 밴드갭 및 울트라 와이드 밴드갭 소재가 우수한 성능을 발휘하는 이유는 다이아몬드의 C–C 결합이나 III-N 반도체의 Al–N 및 Ga–N 결합과 같이 더 강하고 짧으며 이온성 또는 공유성이 강한 결합에서 비롯된 더 넓은 밴드갭 때문입니다. 이는 전자를 국소화하고 궤도 중첩을 줄여 밴드 간에 큰 에너지 분리를 생성합니다. C, N, B와 같은 가벼운 원자를 포함하는 이러한 단단한 결합 네트워크는 높은 포논 에너지와 우수한 열전도율을 생성하여 고온 및 고전력 작동을 가능하게 합니다.

WBG 소재의 밴드갭은 일반적으로 2~4eV 범위로, 실리콘(~1.2eV)보다 훨씬 큽니다. 주요 소재로는 탄화규소(SiC, ~3.2eV)와 질화갈륨(GaN, ~3.4eV)이 있으며, 이들은 고전압, 고온 및 고주파 전력 및 무선 주파수(RF) 소자에 널리 사용됩니다. UWBG 소재는 밴드갭이 4eV를 초과하여 성능을 한층 더 끌어올리며, 실리콘 및 WBG 소재보다 획기적인 개선을 제공합니다. 여기에는 산화갈륨(β‑ Ga₂O₃, ~4.8eV), 질화알루미늄(AlN, ~6.2eV) 및 입방정 질화붕소(c‑BN, ~6.4eV)와 같은 소재가 포함됩니다. 또한 UWBG는 항복 강도, 전력 밀도 및 극한 환경 대응 능력에서도 향상된 성능을 제공합니다.

데이터 기반 분석은 WBG 반도체 전환의 근본적인 동인을 검토하는 데 도움을 줍니다. 또한 전력 전자, 광전자 공학 및 센싱 응용 분야 전반에 걸친 혁신적인 영향을 탐색할 수 있게 해줍니다. 선택된 CAS Registry Numbers®와 응용 분야별 CAS 제어 용어를 기반으로 구축된 집중 검색 전략을 사용하여, CAS Content Collection™에서 CAS IP Finder, powered by STN^TM을 통해 77,000건 이상의 저널 논문과 특허 패밀리를 식별했습니다.

데이터에 따르면 WBG 및 UWBG 반도체는 가속화된 과학적 성과와 강력한 상용화 추세를 특징으로 하는 빠르게 발전하는 상업적 관련 기술 분야입니다. 2016년부터 2025년까지의 출판 동향은 지속적인 상승세를 보이며, 2019년 이후 눈에 띄게 가속화되어 2025년에 정점에 달했습니다. 이는 해당 분야가 탐색적 연구에서 기술적 성숙 단계로 전환되고 있음을 보여주는 분명한 신호입니다. 저널 출판물을 앞지르는 특허는 이러한 변화를 뒷받침합니다. 업계는 더 이상 관망하는 단계가 아니라 지식재산권을 보호하고, 혁신을 확장하며, 소자의 시장 통합을 추진하고 있습니다.

탄화규소와 질화갈륨이 소재 시장을 주도하고 있습니다

The relative contribution of journals and patents within each material category in Figure 2 (central chart), shows that journal publications are relatively balanced between WBG (57%) and UWBG (43%), whereas patent activity leans more toward WBG materials (64% WBG vs. 36% UWBG). This contrast indicates that while WBG materials are already translating into commercial technologies, UWBG materials remain largely research-driven, with broader commercialization expected to follow as technical maturity and industrial confidence increase.

Within the WBG category (Figure 2 right), silicon carbide and gallium nitride dominate, but with notably different journal-patent dynamics. Silicon carbide exhibits a patent‑heavy profile, reflecting its industrial maturity and widespread commercialization in power electronics. Gallium nitride, by contrast, shows a more balanced journal‑to‑patent ratio, indicating active academic innovation alongside growing but less concentrated commercialization.  

Additionally, AI and machine learning approaches are increasingly applied to mature WBG platforms such as silicon carbide and gallium nitride to support device modeling, defect analyses, and manufacturing yield optimization. In parallel, there’s a notable resurgence of interest in phosphide WBG materials, such as AlP and GaP, driven by revised hybrid-functional bandgap calculations that position them alongside traditional III–V semiconductors for future high-frequency and heterostructure applications.

On the UWBG side, the landscape is dominated by broad academic exploration, with significant journal activity in AlN, BN, diamond, and emerging materials like Ga₂O₃. Patent activity in UWBG materials is more focused, especially around AlN, which stands out as the most commercially promising candidate in this class. This is attributed to its thermal management properties bridging current market needs.  

Collectively, these patterns reveal a technology pipeline in which silicon carbide and gallium nitride occupy the mature, deployment‑ready end of the spectrum, while UWBG materials remain research‑intensive but show early signs of industrial uptake, marking them as the next frontier for future extreme‑environment technologies.  

Device landscape reveals the technology readiness level

To understand how these material trends translate into practical technology adoption, we used CAS-indexed concepts to map WBG and UWBG materials to specific device categories, from power electronics to radio frequency components.  

The device distribution highlights how WBG and UWBG semiconductors concentrate around functions where their electrical, thermal, and optical advantages translate into performance gains (see Figure 3). Transistor technologies dominate because these materials enable voltage handling, switching speed, and heat tolerance far beyond what silicon can support. This is reflected in the strong activity across advanced transistor architectures, HEMTs, FinFETs, MISFETs, and HEFTs, which rely on high breakdown fields and fast carrier transport to deliver efficient high-power and high-frequency operations. Light-emitting devices form the next major cluster, in which wide bandgaps allow efficient photon generation across a broad spectrum, supporting LEDs, microLED displays, semiconductor lasers, and UV emitters used in communication, sensing, and sterilization.  

Beyond these dominant device families, the spread into integrated circuits (ICs), memory elements, thermal-management components, energy-storage interfaces, and sensing layers shows how the stability, high-field tolerance, and chemical robustness of WBG/UWBG materials enable electronics to function reliably in high heat, voltage, and radiation conditions, as well as corrosive environments that push beyond silicon’s operating envelope.

Recent innovations describe amorphous silicon carbide combined with nano‑silicon and hydrocarbon phases to create compressive, mechanically resilient electrode frameworks that suppress volume expansion and improve cycling stability and rate performance. Silicon carbide and boron nitride also feature prominently in thermal‑management components, particularly for EV battery modules, where their high thermal conductivity, electrical insulation, and extreme temperature stability enable efficient heat spreading and robust structural performance.  

Patents show their use in ceramic coatings, vapor-chamber interfaces, and heat-dissipating layers designed to maintain safe, compact battery-pack operation. In gas-sensing applications, WBG/UWBG oxides and nitrides, including AlN, Ga₂O₃, and GaN, provide chemically stable, high-bandgap barrier layers that support electron-tunneling detection and selective chemisorption. Developments include conformal UWBG coatings over porous sensing films to achieve drift-resistant, high-accuracy miniature gas sensors suitable for harsh environments.

Emerging device applications for wide bandgap semiconductors

While the device landscape describes how WBG and UWBG materials are distributed across device categories, examining devices through their average growth rates in recent years (2023-2025) offers a complementary view on research and patent activity.  

The emerging device landscape reveals how WBG and UWBG materials are extending innovation into new regimes that were previously inaccessible (see Figure 4). One striking observation is the association of silicon carbide with femtosecond laser‑related device activity. Although silicon carbide is an indirect bandgap material and not suitable as a traditional laser medium, this link reflects rapid progress in femtosecond laser‑based color‑center engineering, where researchers can now write quantum defects inside silicon carbide with high spatial precision. This is an emerging capability known as quantum defect engineering that is unlocking new quantum photonics and sensing platforms.

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Another prominent observation is the growing appearance of boron nitride in IC‑ and gate‑related categories. Boron nitride is not an active semiconductor for logic applications. Instead, it is becoming a vital interface engineering and insulating/dielectric material in advanced transistor architectures. Its atomically flat surface, UBG, and chemically inert nature make boron nitride indispensable for 2D FETs, gate dielectrics, barrier layers, and nanoscale IC layouts, which explains its sharp rise in publications tied to ICs and gate structures.

Gallium nitride’s association with MESFETs aligns with its established role as an active semiconductor channel in these devices. Its wide bandgap ensures low leakage and high breakdown voltages, while high electron mobility and saturation velocity support efficient high‑frequency and high‑power operations. These properties make gallium nitride MESFETs well suited for fast switching and radio frequency (RF) applications.

More broadly, gallium nitride and Ga₂O₃ cluster around high‑power and high‑frequency device categories, reflecting intensifying demand for components capable of operating reliably under extreme thermal and electrical conditions. In contrast, GaP, AlN, and zinc gallate anchor rapidly expanding optoelectronic domains — from UV emission to advanced sensing and display technologies — while AlP appears as a small‑volume but strategically emerging material linked to next‑generation photodetectors, memory devices, and UV sources.  

Overall, the landscape of emerging devices underscores how intrinsic material advantages are steering innovation across power electronics, photonics, and new nanoscale device platforms.

How devices translate to applications of wide bandgap semiconductors

We can get a sense of the major application categories for WBG and UWBG semiconductors through the device landscape. By examining overall publication volume and journal‑to‑patent ratios, however, we can identify which fields show stronger commercial pulls and which remain more research‑leaning within the broader innovation spectrum.

The application landscape shows optoelectronics and power electronics as the most publication‑dense domains, with near‑balanced journal-to-patent (J/P) ratios (≈1.0) reflecting strong academic research supported by active patenting across GaN/AlGaN‑based LEDs, UV emitters, laser architectures, SiC MOSFETs, and GaN HEMTs (see Figure 5A). Communication and sensing applications fall into a mid‑range J/P zone (≈0.7–0.8), indicating steady academic interest with more selective, early‑stage patenting as materials like GaN, AlN, and Ga₂O₃ enable stable, high‑accuracy RF and gas‑sensing platforms under harsh conditions.  

Energy‑storage and conversion systems show the lowest J/P ratios (≈0.18), pointing to a patent‑driven profile where innovations such as silicon carbide‑reinforced anodes, boron nitride and Ga₂O₃ interfacial engineering, and diamond‑based electrode architectures are advanced through targeted industrial development despite lower overall publication volumes.

Optoelectronics

WBG/UWBG materials now anchor the optoelectronics stack from deep‑UV to near‑IR, with gallium nitride and silicon carbide leading publication volumes and AlN, BN, diamond, and Ga₂O₃ expanding capability into the UV‑C and harsh‑environment regimes (see Figure 5B). Gallium nitride and AlGaN underpin high‑efficiency LEDs, micro‑LEDs, lasers, and visible‑light communication (VLC), while silicon carbide provides thermally robust substrates and co‑integration pathways for high‑power emitters and RF front‑ends.  

On the ultra-wide-bandgap frontier, AlN and boron nitride (including h-BN) enable solar-blind photodetectors and deep-UV emitters. Diamond contributes extreme thermal conductivity and quantum-photonics functionality, and Ga₂O₃ pushes power handling and UV detection via its high breakdown field. Around these materials, the patent corpus reveals accelerating progress in epitaxy, polarity control, nanostructuring, surface passivation, and singulation. This kind of process innovation turns lab-scale breakthroughs into scalable devices.  

The device space reflects this: micro-LEDs and quantum-dot color conversion for advanced displays; III-N lasers and VCSEL-class architectures for compact, efficient light sources; and emerging superconducting-semiconducting hybrids for single-photon detection, where WBGs such as silicon carbide are used as substrate to withstand high critical temperature.

This trajectory is tightly coupled to industries where leading companies convert WBG/UWBG science into manufacturing-ready platforms. Device makers such as Samsung, Sony, AMS OSRAM, TCL Technology, and Mitsubishi Electric dominate patents in LEDs, micro-LED displays, lasers, and imaging systems. This aligns with the GaN/AlGaN publication dominance and pushes toward finer pixels, higher brightness, and better color conversion. Disco and Applied Materials contribute the enabling infrastructure, such as laser dicing, wafer thinning, bonding, surface treatment, and die-level handling, needed to process brittle, thermally demanding WBG/UWBG wafers at volume.  

Foundries and integrators (e.g., TSMC, Intel) extend the stack with silicon photonics, III‑N RF integration, and back‑end packaging flows, while specialized silicon carbide and gallium nitride materials providers stabilize the substrate and epitaxy supply chain. This creates a self‑reinforcing cycle: advances in materials unlock new device concepts, which in turn drive patents in manufacturability and yield‑critical steps, thereby propelling the industry toward increasingly mature, scalable WBG/UWBG technology platforms.

Power electronics

The patent landscape reveals a power electronics ecosystem undergoing rapid maturation, driven predominantly by silicon carbide and gallium nitride (see Figure 5B). Silicon carbide stands out as the central pillar, with numerous patents on silicon carbide semiconductor devices, epitaxial wafer technologies, and high‑voltage modules designed for electric vehicles, industrial drives, and railway power systems. Its high thermal conductivity, wide bandgap, and breakdown strength make silicon carbide the material of choice for traction inverters, onboard chargers, and high‑efficiency power conversion circuits.  

Gallium nitride, meanwhile, is increasingly integrated for high‑frequency and high‑power switching, with patents describing advanced HEMTs and gallium nitride layers grown over silicon carbide substrates to unlock higher power densities. Together, silicon carbide and gallium nitride form the technological backbone of modern power conversion, each reinforcing the other’s performance envelope.

Across applications, transportation and industrial power conversion dominate, with nearly one-third of patents tied to EV traction systems, mobility control, and heavy-duty automation. Power-conversion and management filings are even more prominent, emphasizing thermal-resistance reduction, advanced AlN packaging, and reliability-driven module design. A consistent theme is that WBG materials alone are insufficient. Packaging, thermomechanical design, and system-level integration must advance in parallel. Many patents focus on supporting infrastructure, including epitaxy control, defect management, wafer thinning, bonding, and specialized RF or sensing modules.  

Sensing

In sensing applications, WBG/UWBG oxides and nitrides provide chemically stable, high-bandgap barrier layers supporting electron-tunneling detection and selective chemisorption. Patents focused on advanced doping and lattice engineering demonstrate efforts to create reliably doped gallium nitride AlN, and Ga₂O₃ materials with controlled p‑ and n‑type regions, improving sensitivity and robustness for high‑temperature pressure, gas, and chemical sensors. These materials’ high breakdown fields and wide bandgaps support deep‑UV photodetectors, RF/microwave sensing, and extreme‑environment sensor electronics, aligning with broader technology development goals highlighted in programs such as DARPA’s UWBG initiative targeting advanced sensor‑grade AlN, c‑BN, and diamond.

Communication

Materials such as gallium nitride, AlN, and SiC now anchor advanced RF communication technologies for 5G, 6G, Wi‑Fi 6E, and emerging sub‑THz systems. Patents heavily focus on high‑efficiency RF power amplifiers and front‑end modules, with gallium nitride favored for its high electron mobility, breakdown strength, and excellent high‑frequency performance. Key innovations include gallium nitride HEMTs, co‑integrated power amplifiers with on‑chip voltage regulation, and multiband front‑end circuits tailored for massive multiple input multiple output (MIMO), millimeter-wave (mmWave) access points, and satellite terminals. AlN‑based Film bulk acoustic resonator (FBAR) and Surface acoustic wave (SAW) resonators remain essential for 5G mid‑band and Wi‑Fi coexistence, leveraging high acoustic velocity and high‑Q materials for low loss and stable filtering at increasingly high frequencies.

에너지 저장

에너지 저장 분야는 저널 대비 특허 비율이 약 0.18로 가장 낮으며, 이는 탄화규소 강화 양극, 질화붕소 계면 공학, 다이아몬드 기반 전극 구조 등이 목표 지향적인 산업 개발을 통해 발전하고 있음을 보여줍니다. 최근 특허들은 비정질 탄화규소와 나노 실리콘을 결합하여 부피 팽창을 억제하고 사이클 안정성을 향상시키는 기계적 탄성 전극 프레임워크를 기술하고 있습니다. 탄화규소와 질화붕소는 전기차 배터리 모듈의 열 관리 부품에서 중요한 역할을 하며, 높은 열전도율과 극한 온도 안정성을 바탕으로 효율적인 열 분산을 가능하게 합니다.

광대역 갭 반도체 기술의 미래

WBG 및 UWBG 반도체의 궤적은 향후 10년간 역량 강화와 상용화가 지속될 것임을 시사합니다. 탄화규소는 전기화된 운송 수단, 재생 에너지 시스템, 산업 자동화 분야에서 더 높은 전압 허용 오차, 열적 견고성, 장기적 신뢰성을 요구함에 따라 고전력 변환의 기반으로 남을 것입니다. 한편, 질화갈륨은 급속 충전 전력 전자 장치, RF 프런트 엔드, 밀리미터파 시스템 및 신흥 서브 테라헤르츠 통신 분야 전반으로 입지를 넓히고 있습니다.

AlN, Ga₂O₃, BN, 다이아몬드와 같은 UWBG 소재는 도핑, 에피택시, 결함 공학적 난제들이 지속적으로 해결됨에 따라 심자외선 포토닉스, 극한 환경 센싱, 초고전압 스위칭, 첨단 유전체 및 양자 소자 인터페이스라는 차세대 영역을 개척할 것으로 기대됩니다.

모든 소재군에 걸쳐 향후 채택을 결정짓는 핵심 요소는 열 관리, 이종 통합, 그리고 확장 가능한 제조 공정이 될 것입니다. 성능이 패키징, 계면 공학, 모듈 수준의 공동 설계에 더 많이 의존하게 됨에 따라, 경쟁 우위는 소재 혁신과 신뢰성 높은 대량 생산을 결합할 수 있는 기업으로 이동할 것입니다.

전망에 따르면 WBG 및 UWBG 반도체는 차세대 에너지, 통신, 모빌리티 및 센싱 기술의 기반이 되어 더욱 전기화되고 연결된 고주파 세상의 핵심 구성 요소 역할을 할 것입니다.