Page 24 - Organic Electronics in Sensors and Biotechnology
P. 24

CHAPTER 1






                                        Scaling Effects in


                                    Organic Transistors



                                            and Transistor-


                                           Based Chemical



                                                          Sensors





               Liang Wang, Daniel H. Fine,
               and Ananth Dodabalapur
               The University of Texas at Austin





          1.1  Scaling Behavior in Organic Transistors


               1.1.1  Charge Transport in Polycrystalline Organic
                       Semiconductors (Intragrain and Intergrain)
               In the past few years, much work has been done with small organic
                                               1
               molecules and conjugated polymers  to manufacture devices that
               take advantage of the unique properties of their conjugated π-electron
               systems, such as organic light-emitting diodes (OLEDs), solar cells,
               smart cards, resistive chemical sensors, and field-effect transistors. 2–5
               Among these applications, the structure of field-effect transistors,
               with an organic or polymer semiconductor as the electrically active
               layer, allows for the study of the two-dimensional transport proper-
               ties of the semiconductor material modulated by the charge carrier
                                           6–8
               density due to increased gate bias.  Organic electronics will not replace
               classic Metal Oxide Semiconductor Field-Effect Transistors (MOSFETs)
                                                                        1
   19   20   21   22   23   24   25   26   27   28   29