▎ 摘　　要

NOVELTY - Syringe based 3D (three-dimensional) printing system comprises spool holder (1), material holder (2), X-axis, Y-axis and Z-axis profiles, support plates (5), base, stepper motor configured to push piston (6) down and inside syringe (10) to extrude printing ink from syringe nozzle, X & Z axis stepper motor connected to X & Z axis profile, belts or screws is used to transmit rotation into linear movement, and using one motor, load for piston, print platform, where print is built by deposition of extruded ink, power supply, tensioner, user interface to input data, and controller system has syringe extrudes printing ink from needle or nozzle, and processor with computer implementable instruction executed on instructions at user interface, causes printer to print thin film of organic or inorganic semiconductor in liquid form, dissolved in solvent and filled in syringe, where film of thickness is 10-200 nanometer is produced on substrate, and operated at extrusion speed at 30 steps/mm. USE - Syringe based 3D printing system used for organic-field effect transistor (OFET), and used in organic solar cells (all claimed), organic electronics, thin-film-based electronic, optical, optoelectronic, and mechanical devices. ADVANTAGE - The syringe based 3D printing system can print a uniform thin film over a wide range of thickness, a few nm to hundreds of micrometer (μm), develops templet-free nanostructures of solution-processable organic and inorganic materials, prints pattern of thin-film on glass, silicon (si), silicon dioxide coated silicon in the desired format over a large area, needs 0-0.5 ml solution for printing, enables to print multilayered structure using sequential printing, and works with an interface of user-friendly software. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) a method of fabrication of semiconductor film for organic-field effect transistor (OFET) using 3D printer system, which involves (i) preparing a solution for organic semiconductor by dissolving poly( 2,5-bis(3-tetradecylthiophen-2-yl)thioeno)(3,2-b)thiopene in chlorobenzene (PBTTT-C14) in solvent at 8 milligram per milliliter (mg/ml); (ii) preparing substrate by thermally growing silicon dioxide (SiO2) layer with 200 nm silicon (si) substrate cleaned sequentially with acetone, methanol, and dissolved water by drying with pressurized nitrogen (N2); (iii) treating the cleaned SiO2with ultraviolet (UV) ozone for 30 minutes; (iv) depositing a self-assemble monolayer (SAM) of octadecyl trichlorosilane (ODTS) by vapor deposition technique; (v) printing a thick film of PBTTT-C14 using solution based printer with the PBTTT-C14 in solvent extruded from the nozzle of the printer at an extrusion speed was 30 steps/mm and feed rate was kept at 100 wt.%; and (vi) thermally evaporating 50 nm gold layer on PBTTT-C14 film through masks for complete fabrication of OFET (organic-field effect transistor); and (2) A method of printing thin film of organic semiconductors in organic solar cells using the printing system, which involves (i) preparing ITO coated glass substrate by sonicating substrate for 20 minutes in a soap solution, dissolved water, acetone, isopropanol followed by exposure to UV-zone for 30 minutes; (ii) printing electron transport layer zinc oxide (ZnO) using a precursor solution as the ink for the printer; (iii) blending a thin film of photoactive organic semiconductor donor, poly (4,8-bis(5-(2-ethylhexyl) thiophen-2-yl)benzo(1,2-b:4,5- b) dithiophene-2,6-diyl-alt-3-fluoro-2-((2ethylhexyl) carbonyl)thieno(3,4-b)thiophene-4,6-diyl) (PTB7-Th), and the acceptor, (PC71BM), printing molecules in ratio 1:1.5 onto ZnO-coated substrate using the printer; and (iv) drying of the active layer by dry nitrogen for 30 minutes followed by deposition of a thin film of molybdenum oxide (MoO3) and silver (Ag) onto the active layer using thermal evaporating technique. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of syringe based 3D printing system. 1spool holder 2material holder 5support plates 6Piston 10Syringe