title: High performance phototransistors of a planar conjugated copolymer.
abstract: A planar conjugated copolymer named HXS-1 was applied in thin film phototransistors. Similar to organic field-effect transistors using V(G) to control the source-drain current, in phototransistors, the light is used to substitute V(G) as an independent variable to control the output of the transistors to realize light detection and signal magnification in a single organic device. All devices exhibited high performance with an on/off ratio up to 4.6 × 10(4) (the highest on/off ratio of organic or polymer phototransistors), which could be assigned to i) the wide absorption features of HXS-1 in the whole UV-vis range, ii) the ideal HOMO energy level of HXS-1 (5.21 eV) to align with Au electrodes (5.2 eV) and iii) the high mobility of the polymer thin films (∼0.06 cm(2) /Vs). Moreover, the devices, both under continuous operation conditions and long term measurement conditions, exhibited excellent stability, indicating potential applications of the devices in polymer-based optoelectronics.
authors.affiliation: Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Huanli
authors.initials: H
authors.lastname: Dong
authors.forename: Zhishan
authors.initials: Z
authors.lastname: Bo
authors.forename: Wenping
authors.initials: W
authors.lastname: Hu
mesh_terms: D004566:Electrodes; D004867:Equipment Design; D010777:Photochemistry / Q000295:instrumentation*; D011108:Polymers / Q000737:chemistry*; D014173:Transistors, Electronic
chemical_list: D011108:Polymers