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All 3D-Printed Flexible ZnO UV Photodetector on an Ultraflat Substrate.
Lee, Dongil; Seol, Myeong-Lok; Motilal, Gabrielle; Kim, Beomseok; Moon, Dong-Il; Han, Jin-Woo; Meyyappan, M.
Afiliación
  • Lee D; Center for Nanotechnology, NASA Ames Research Center, Moffett Field, California94035, United States.
  • Seol ML; Universities Space Research Association, NASA Ames Research Center, Moffett Field, California94035, United States.
  • Motilal G; Center for Nanotechnology, NASA Ames Research Center, Moffett Field, California94035, United States.
  • Kim B; Universities Space Research Association, NASA Ames Research Center, Moffett Field, California94035, United States.
  • Moon DI; Center for Nanotechnology, NASA Ames Research Center, Moffett Field, California94035, United States.
  • Han JW; Center for Nanotechnology, NASA Ames Research Center, Moffett Field, California94035, United States.
  • Meyyappan M; Universities Space Research Association, NASA Ames Research Center, Moffett Field, California94035, United States.
ACS Sens ; 5(4): 1028-1032, 2020 04 24.
Article en En | MEDLINE | ID: mdl-32200620
An all three-dimensional (3D)-printed flexible ZnO ultraviolet (UV) photodetector is demonstrated, where the 3D-printing method is used not only for the electrode and photosensitive material but also for creating a substrate. An ultraflat and flexible substrate capable of serving as the backbone layer is developed using a water-dissolvable polymer layer for surface planarization. A two-layered printing followed by surface treatment is demonstrated for the substrate preparation. As mechanical support but flexible, a thick and sparse thermoplastic polyurethane layer is printed. On its surface, a thin and dense poly(vinyl alcohol) (PVA) is then printed. A precise control of PVA reflow using a microwater droplet results in a flexible and extremely uniform substrate. A Cu-Ag nanowire network is directly 3D printed on the flexible substrate for the conducting layer, followed by ZnO for the photosensitive material. Unlike the planar two-dimensional printing that provides thin films, 3D printing allows the electrode to have a step height, which can be made like a dam to accommodate a thick film of ZnO. Photosensitivity as a function of various ZnO thickness values was investigated to establish an optimal thickness for UV response. The device was also tested in natural sunlight along with stability and reliability.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Óxido de Zinc Idioma: En Revista: ACS Sens Año: 2020 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Óxido de Zinc Idioma: En Revista: ACS Sens Año: 2020 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos