| 학회 | 한국재료학회 |
| 학술대회 | 2021년 가을 (11/24 ~ 11/26, 경주 라한호텔) |
| 권호 | 27권 2호 |
| 발표분야 | 특별심포지엄 3. 나노기술 기반 초고속 광정보 소자 심포지엄-오거나이저: 송용원(KIST) |
| 제목 | 2차원 나노 반도체 이종 접합 광다이오드 및 이미지 센서 (2D van der Waals heterojunction photodiodes and image sensor applications) |
| 초록 | Two-dimensional (2D) van der Waals (vdW) atomic crystals have become an important material class owing to their extraordinary physical and chemical properties. One of the most significant advantages of using 2D vdW materials is the freedom from the constraint of atomic lattice matching for vertical stacking due to the dangling-bond-free nature. vdW heterostructures can be readily implemented, thereby facilitating fundamental studies of new phenomena, such as magic-angle-induced superconductivity in bilayer graphene. Additionally, such heterostructures provide a versatile platform for diverse device applications. In fact, 2D heterojunction devices have been extensively studied, and several high-performance optoelectronic devices have been demonstrated. Here, we report several vdW heterostructures for advanced optoelectronic applications. 2D WSe2/MoS2 heterojunction PN diode shows excellent performance with an ideality factor of 1.5 and a high rectification (ON/OFF) ratio of over 106. This PN diode exhibits spectral photo-responses from the ultraviolet (405 nm) region to the near infrared (808 nm) region with obvious photovoltaic behaviors. On the other hand, 2D MoTe2/MoS2 multilayers van der Waals heterojunction PN diode also shows excellent performance with an ideality factor of 1.7 and high rectification (ON/OFF) ratio of over 104 and broad spectral hotodetection capability over the range from violet (405 nm) to near-infrared (1310 nm) wavelengths and a remarkable linear ynamic range of 130 dB. Beyond basic photodetection, we successfully demonstrate a prototype self-powered visible-invisible multiband image sensors based on both WSe2/MoS2 and MoTe2/MoS2 photodiodes. We believe that our results pave the way for more advanced developments in optoelectronic systems based on 2D vdW heterostructures |
| 저자 | 황도경 |
| 소속 | 한국과학기술(연) |
| 키워드 | 2D van der Waals materials; heterostructure; photodiode; image sensor |
