Light-responsive self-strained organic semiconductor for large flexible OFET sensing array

Abstract

With the wide application of organic semiconductors (OSCs), researchers are now grappling with a new challenge: design and synthesize OSCs materials with specific functions to satisfy the requirements of high-performance semiconductor devices. Strain engineering is an effective method to improve the semiconductor material’s carrier mobility, which is fundamentally originated from the rearrangement of the atomic packing model of materials under mechanic stress. Here, we design and synthesize a new OSC material named AZO-BTBT-8 based on high-mobility benzo[b]benzo[4,5]thieno[2,3-d]thiophene (BTBT) as the semiconductor backbone. Octane is employed to increase molecular flexibility and solubility, and azobenzene at the other end of the BTBT backbone provides photoisomerization properties and structural balance. Notably, the AZO-BTBT-8 photoisomerization leads to lattice strain in thin-film devices, where exceptional device performance enhancement is realized. On this basis, a large-scale flexible organic field-effect transistor (OFET) device array is fabricated and realizes high-resolution UV imaging with reversible light response.

Halogen Bond-Driven Aggregation-Induced Emission Skeleton: N-(3-(Phenylamino)allylidene) Aniline Hydrochloride

“…35 When PA was washed with H 2 O or NaOH dilute solution (0.001 M), the AQY of the treated PA powder decreased to 21.41% or 3.81%, respectively, which indicated that H 2 O might destroy the ordered stacking of PA molecules. The structure of PA treated with NaOH was verified to be intact after 1 H NMR, 13 C NMR, and mass spectrometry (Figure S1). While the removal of hydrochloride from PA by NaOH led to the disappearance of the AIE effect, this highlighted the critical role of hydrochloride in the luminescence and will be discussed in the single-crystal structure analysis.…”

“…All products were carefully characterized by 1 H NMR, 13 C NMR, and MS, with the synthesis route illustrated in Schemes S1−S22, and the characterization data described in Figures S23−S95; Table S1, spectral parameters of the PA derivatives; Table S2, crystal data and structure refinements for PA, PA-3CH 3 O, and PA-CF 3 ; and Table S3, performance of LED devices 1−4 (PDF) Movie S1, PA emitted strong yellow fluorescence at low temperatures (MP4) X-ray crystallographic data for PA (CIF) X-ray crystallographic data for PA-3CH 3 O (CIF) X-ray crystallographic data for PA-CF 3 (CIF)…”

“…■ EXPERIMENTAL SECTION NMR Test. 1 H, 13 C, and COSY nuclear magnetic resonance (NMR) spectra were recorded at 298 K using a Bruker AVANCE III 400 MHz or AVANCE III HD 700 MHz spectrometer (Bruker, Germany), automatically tuned and matched to the correct operating frequencies. Cryogenic NMR experiments were performed on a Bruker Avance III 400 MHz spectrometer, and PA was dissolved in CD 3 OD with a concentration of 58 mM.…”

“…TopSpin 3.5 and Mestrenova 14.0.0 were used to apply phase and baseline corrections. Chemical shift values for 1 H and 13 C NMR are reported in ppm with the solvent resonance as the internal standard (DMSO-d 6 , 2.50 ppm for 1 H, 39.6 ppm for 13 C; CD 3 OD, 3.31 ppm for 1 H, 48.8 ppm for 13 C), and coupling constants are reported in Hz. Abbreviations for multiplicity are as follows: s, singlet; d, doublet; t, triplet; m, multiplet; br, broad.…”

“…Among them, solid-state luminescence has attracted significant attention from the chemical, biological, and materials science communities due to its enormous application potential. For example, optoelectronics applications such as organic light-emitting diodes (OLEDs) and organic field-effect transistors (OFET) , are used as crystals or solid thin films. Generally, most luminescent substances display weak emissions at high concentrations or in the solid state due to aggregation-caused quench (ACQ) by nonradiative decay, which is unexpected and disadvantageous to luminescent substance applications based on the photophysical performance in the solid states .…”