Lee, Young Tack Jeon, Pyo Jin Han, Jae Hyun Ahn, Jongtae Lee, Hyo Sun Lim, June Yeong Choi, Won Kook Song, Jin Dong Park, Min-Chul Im, Seongil Hwang, Do Kyung 2024-01-20T00:00:34Z 2024-01-20T00:00:34Z 2021-09-03 2017-12 1616-301X https://pubs.kist.re.kr/handle/201004/121916 2D layered van der Waals (vdW) atomic crystals are an emerging class of new materials that are receiving increasing attention owing to their unique properties. In particular, the dangling-bond-free surface of 2D materials enables integration of differently dimensioned materials into mixed-dimensional vdW heterostructures. Such mixed-dimensional heterostructures herald new opportunities for conducting fundamental nanoscience studies and developing nanoscale electronic/optoelectronic applications. This study presents a 1D ZnO nanowire (n-type)–2D WSe2 nanosheet (p-type) vdW heterojunction diode for photodetection and imaging process. After amorphous fluoropolymer passivation, the ZnO–WSe2 diode shows superior performance with a much-enhanced rectification (ON/OFF) ratio of over 106 and an ideality factor of 3.4–3.6 due to the carbon–fluorine (CF) dipole effect. This heterojunction device exhibits spectral photoresponses from ultraviolet (400 nm) to near infrared (950 nm). Furthermore, a prototype visible imager is demonstrated using the ZnO–WSe2 heterojunction diode as an imaging pixel. To the best of our knowledge, this is the first demonstration of an optoelectronic device based on a 1D–2D hybrid vdW heterojunction. This approach using a 1D ZnO–2D WSe2 heterojunction paves the way for the further development of electronic/optoelectronic applications using mixed-dimensional vdW heterostructures. English John Wiley & Sons Ltd. Mixed-Dimensional 1D ZnO-2D WSe2 van der Waals Heterojunction Device for Photosensors Article 10.1002/adfm.201703822 1 Advanced Functional Materials, v.27, no.47 Advanced Functional Materials 27 47 N scie scopus 000417921800004 2-s2.0-85038008759 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article FIELD-EFFECT TRANSISTORS 2D SEMICONDUCTOR HIGH-PERFORMANCE TOP-GATE METAL TRANSITION GRAPHENE OPTOELECTRONICS JUNCTIONS DIODE 1D ZnO 2D WSe2 imagers mixed-dimensional van der Waals heterojunctions photodetectors