Electrochemical device

Abstract

An electrochemical device is provided, comprising a source contact connected to a first antenna pad, a drain contact connected to a second antenna pad, at least one gate electrode, an electrochemically active element arranged between, and in direct electrical contact with, the source and drain contacts, which electrochemically active element comprises a transistor channel and is of a material comprising an organic material having the ability of electrochemically altering its conductivity through change of redox state thereof, and a solidified electrolyte in direct electrical contact with the electrochemically active element and the at least one gate electrode and interposed between them in such a way that electron flow between the electrochemically active element and the gate electrode(s) is prevented. In the device, flow of electrons between source contact and drain contact is controllable by means of a voltage applied to the gate electrode(s).

1 . A supported or self-supporting electrochemical transmitter device comprising:
 a transistor member electrically connected to an antenna member arranged for transmitting a signal,   wherein the transistor member has   a source contact,   a drain contact,   at least one gate electrode,   an electrochemically active element arranged between, and in direct electrical contact with, the source and drain contacts, which electrochemically active element comprises a transistor channel and is of a material comprising an organic material having the ability of electrochemically altering its conductivity through change of redox state thereof, and   a solidified electrolyte in direct electrical contact with the electrochemically active element and said at least one gate electrode and interposed between them in such a way that electron flow between the electrochemically active element and said gate electrode(s) is prevented,   
     flow of electrons between the source contact and the drain contact being controllable by means of a voltage applied to said gate electrode(s); and wherein
 the antenna member has a first antenna pad and a second antenna pad, the first antenna pad comprising a metal or electrically conductive organic or polymer material, and being in direct electrical contact with the source contact of the transistor member, the second antenna pad comprising a metal or electrically conductive organic or polymer material, and being in direct electrical contact with the drain contact of the transistor member. 
 
   
   
       2 . An electrochemical transmitter device according to  claim 1 , in which said source and drain contacts, gate electrode(s) and electrochemically active element are arranged in one common plane. 
   
   
       3 . An electrochemical transmitter device according to  claim 2 , in which a continuous or interrupted layer of said solidified electrolyte covers the electrochemically active element and covers at least partially said gate electrode(s). 
   
   
       4 . An electrochemical transmitter device according to  claim 1 , in which at least one of said antenna pads, source and drain contacts and gate electrode(s) is formed from the same material as the electrochemically active element. 
   
   
       5 . An electrochemical transmitter device according to  claim 4 , in which all of said antenna pads, source and drain contacts and gate electrode(s) are formed from the same material as the electrochemically active element. 
   
   
       6 . An electrochemical transmitter device according to  claim 4 , in which the antenna pads, source and drain contacts and the electrochemically active element are formed from a continuous piece of said material comprising an organic material. 
   
   
       7 . An electrochemical transmitter device according to  claim 1 , in which said transistor channel retains its redox state upon removal of the gate voltage. 
   
   
       8 . An electrochemical transmitter device according to  claim 1 , in which said transistor channel spontaneously returns to its initial redox state upon removal of the gate voltage. 
   
   
       9 . An electrochemical transmitter device according to  claim 8 , in which the electrochemically active element further comprises a redox sink volume adjacent to the transistor channel, the device comprising at least two gate electrodes arranged on opposite sides of the electrochemically active element so that one gate electrode is closer to the transistor channel and one gate electrode is closer to the redox sink volume. 
   
   
       10 . An electrochemical transmitter device according to  claim 1 , in which said organic material is a polymer. 
   
   
       11 . An electrochemical transmitter device according to  claim 10 , in which said polymer material is selected from the group consisting of polythiophenes, polypyrroles, polyanilines, polyisothianaphtalenes, polyphenylene vinylenes and copolymers thereof. 
   
   
       12 . An electrochemical transmitter device according to  claim 11 , in which said polymer material is a polymer or copolymer of a 3,4-dialkoxythiophene, in which said two alkoxy groups may be the same or different or together represent an optionally substituted oxy-alkylene-oxy bridge. 
   
   
       13 . An electrochemical transmitter device according to  claim 12 , in which said polymer or copolymer of a 3,4-dialkoxythiophene is selected from the group consisting of poly(3,4-methylenedioxythiophene), poly(3,4-methylenedioxythiophene) derivatives, poly(3,4-ethylenedioxythiophene), poly(3,4-ethylenedioxythiophene) derivatives, poly(3,4-propylenedioxythiophene), poly(3,4-propylenedioxythiophene) derivatives, poly(3,4-butylenedioxythiophene), poly(3,4-butylenedioxythiophene) derivatives, and copolymers therewith. 
   
   
       14 . An electrochemical transmitter device according to  claim 1 , in which said organic material further comprises a polyanion compound. 
   
   
       15 . An electrochemical transmitter device according to  claim 14 , in which said polyanion compound is poly(styrene sulphonic acid) or a salt thereof. 
   
   
       16 . An electrochemical transmitter device according to  claim 1 , in which said solidified electrolyte comprises a binder. 
   
   
       17 . An electrochemical transmitter device according to  claim 16 , in which said binder is a gelling agent selected from the group consisting of gelatine, a gelatine derivative, polyacrylic acid, polymethacrylic acid, poly(vinylpyrrolidone), polysaccharides, polyacrylamides, polyurethanes, polypropylene oxides, polyethylene oxides, poly(styrene sulphonic acid) and poly(vinyl alcohol), and salts and copolymers thereof. 
   
   
       18 . An electrochemical transmitter device according to  claim 1 , in which said solidified electrolyte comprises an ionic salt. 
   
   
       19 . An electrochemical transmitter device according to  claim 1 , which is self-supporting. 
   
   
       20 . An electrochemical transmitter device according to  claim 1 , which is arranged on a support. 
   
   
       21 . An electrochemical transmitter device according to  claim 20 , in which said support is selected from the group consisting of polyethylene terephthalate, polyethylene naphthalene dicarboxylate, polyethylene, polypropylene, polycarbonate, paper, coated paper, resin-coated paper, paper laminates, paperboard, corrugated board and glass. 
   
   
       22 . A supported or self-supporting electrochemical device comprising:
 (i) an electrochemical transistor member having
 a source contact, 
 a drain contact, 
 at least one gate electrode, 
 an electrochemically active element arranged between, and in direct electrical contact with, the source and drain contacts, which electrochemically active element comprises a transistor channel and is of a material comprising an organic material having the ability of electrochemically altering its conductivity through change of redox state thereof, and 
 a solidified electrolyte in direct electrical contact with the electrochemically active element and said at least one gate electrode and interposed between them in such a way that electron flow between the electrochemically active element and said gate electrode(s) is prevented, 
   
     wherein flow of electrons between source contact and drain contact is controllable by means of a voltage applied to said gate electrode(s); and
 (ii) an antenna member for transmitting a signal, the antenna member having an antenna pad, said antenna pad being in direct electrical contact with the source contact of said transistor member, 
 said drain contact of said transistor member being electrically connected to ground. 
 
   
   
       23 . A process for manufacturing of an electrochemical device as defined in  claim 1 , wherein said antenna pad(s), contacts, electrode(s), electrochemically active element and/or electrolyte are deposited by means of printing techniques. 
   
   
       24 . A process according to  claim 23 , wherein said antenna pad(s), contacts, electrode(s), electrochemically active element and electrolyte are deposited by means of coating techniques. 
   
   
       25 . A process according to  claim 23 , in which device said organic material comprises a polymer, which process comprises deposition of said polymer on a support through in situ polymerisation. 
   
   
       26 . A process according to  claim 23 , comprising patterning of any one of said contacts, electrode(s) and electrochemically active element using a subtractive method. 
   
   
       27 . A process according to  claim 26 , in which patterning is performed through chemical etching. 
   
   
       28 . A process according to  claim 26 , in which said patterning is performed through gas etching. 
   
   
       29 . A process according to  claim 26 , in which said patterning is performed by mechanical means, comprising scratching, scoring, scraping and milling. 
   
   
       30 . An electrochemical device according to  claim 5 , in which the antenna pads, source and drain contacts and the electrochemically active element are formed from a continuous piece of said material comprising an organic material. 
   
   
       31 . A process according to  claim 24 , in which device said organic material comprises a polymer, which process comprises deposition of said polymer on a support through in situ polymerisation. 
   
   
       32 . A process according to  claim 24 , comprising patterning of any one of said contacts, electrode(s) and electrochemically active element using a subtractive method. 
   
   
       33 . A process according to  claim 25 , comprising patterning of any one of said contacts, electrode(s) and electrochemically active element using a subtractive method. 
   
   
       34 . An electrochemical device according to  claim 1 , wherein said transmitted signal is an identification code. 
   
   
       35 . An electrochemical device according to  claim 1 , wherein said transmitted signal is a radio frequency signal. 
   
   
       36 . An electrochemical device according to  claim 1 , wherein said transmitted signal is remotely read by a read-out device. 
   
   
       37 . A process according to  claim 22 , wherein said transmitted signal is an identification code. 
   
   
       38 . A process according to  claim 22 , wherein said transmitted signal is a radio frequency signal. 
   
   
       39 . A process according to  claim 22 , wherein said transmitted signal is remotely ready by a read-out device.