title: Boosting Responsivity of Organic-Metal Oxynitride Hybrid Heterointerface Phototransistor.
abstract: Amorphous metal oxides are attractive materials for various sensor applications, because of high electrical performance and easy processing. However, low absorption coefficient, slow photoresponse, and persistent photoconductivity of amorphous metal oxide films from the origin of deep-level defects are obstacles to their use as photonic applications. Here, we demonstrate ultrahigh photoresponsivity of organic-inorganic hybrid phototransistors featuring bulk heterojunction polymers and low-bandgap zinc oxynitride. Spontaneous formation of ultrathin zinc oxide on the surface of zinc oxynitride films could make an effective band-alignment for electron transfer from the dissociation of excitons in the bulk heterojunction, while holes were blocked by the deep highest occupied molecular orbital level of zinc oxide. These hybrid structure-based phototransistors are ultrasensitive to broad-bandwidth photons in ultraviolet to near-infrared regions. The detectivity and a linear dynamic range exceeded 10(12) Jones and 122.3 dB, respectively.
authors.forename: You Seung
authors.initials: YS
authors.lastname: Rim
authors.affiliation: The Division of Materials Science and Engineering, Hanyang University , Seoul 04763, Korea.
authors.forename: Kyung-Chul
authors.initials: KC
authors.lastname: Ok
authors.forename: Yang Michael
authors.initials: YM
authors.lastname: Yang
authors.forename: Huajun
authors.initials: H
authors.lastname: Chen
authors.forename: Sang-Hoon
authors.initials: SH
authors.lastname: Bae
authors.forename: Chen
authors.initials: C
authors.lastname: Wang
authors.forename: Yu
authors.initials: Y
authors.lastname: Huang
authors.affiliation: The Division of Materials Science and Engineering, Hanyang University , Seoul 04763, Korea.
authors.forename: Jin-Seong
authors.initials: JS
authors.lastname: Park
authors.forename: Yang
authors.initials: Y
authors.lastname: Yang
keywords: bulk heterojunction; heterointerface; oxide semiconductor; phototransistor; thin-film transistor; zinc oxynitride