Fabrication And Optoelectronic Properties Of Organic Semiconductor Micro/Nanostructures

In recent years,organic semiconductor micro/nanocrystals have attracted more and more attention due to their unique properties.The organic semiconductor micro/nanocrystals have the advantages of good sources,good optoelectronic performanceand high transparency,which make them play an important role in the flexible electronic devices in future.However,there still exist challenges in the facile fabrication of organic semiconductor micro/nanocrystals with desired size,dimension,surface state,polarizing and defects.In this thesis,we chose several representative small molecule organic semiconductor materials,including P-type organic semiconductor and N-type organic semiconductor.The organic semiconductor micro/nanocrystals were fabricated by the solution-processed self-assembled method.The micro/nanocrystals-based devices were constructed to study optoelectronic properties.The main contents are as follows:The P-type organic semiconductor micro/nanowires,including CoOEP microwires,PtOEP microwires and CuOEP ultralong nanowires,were fabricated through different solution-processed methods and studied the optoelectronic detection performance.The micro/nanowires showed smooth surface,high crystallinity and good optoelectronic detection performance.Moreover,the ultralong CuOEP nanowires showed high stability and sensitivity with the 5000 I_on/off.The N-type organic semiconductor nanofibers,including PTCDI-C8 nanofibers,PTCDI-C13 nanofibers and BP-PTCDI nanofibers,were fabricated through the same solution-processed method and studied the optoelectronic detection performance.The nanofibers showed smooth surface and good optoelectronic detection performance.The P-N type organic charge transfer complex?PTZ-TCNQ co-crystal microwires?was fabricated through the solution-processed method and studied the field effect transistor performance.Electron acceptor molecule and electron donor molecule were TCNQ and PTZ.The prepared PTZ-TCNQ co-crystal microwires showed smooth surface and good crystallinity.In addition,the prototype device based on an individual PTZ–TCNQ co-crystal microwire was constructed and exhibited ambipolar charge transport characteristics.