Organic field effect transistor with off-set threshold voltage and the use thereof

• US 20050211972A1
• Filed: 09/12/2002
• Published: 09/29/2005
• Est. Priority Date: 12/11/2001
• Status: Active Grant

• Current Assignee: PolyIC GmbH & Co. KG (Leonhard KURZ Stiftung & Company KG)
• Original Assignee: Siemens AG
• Inventors: Fix, Walter, Ullmann, Andreas
• Granted Patent: US 7,064,345 B2
• Time in Patent Office: Days
• US Class Current: 257/40
• CPC Class Codes: H10K 10/464 Lateral top-gate IGFETs comprising only a single gate

Abstract

The invention relates to an organic field effect transistor with off-set threshold voltage. Said OFET has an intermediate layer that defines a space charge region between the insulator and the semiconductor.

Claims

1. An OFET, having a threshold voltage, comprising:

a substrate;

an active semiconductor layer; and

an intermediate layer adjacent to the active semiconductive layer,

which intermediate layer offsets the threshold voltage of the OFET by defining a space charge region in the active layer.

2. OFET according to claim 1, whereby the intermediate layer is located between the substrate and the active layer.

3. OFET according to claim 1, including a gate insulation layer, whereby the intermediate layer is located between the active layer and the gate insulator layer.

4. OFET according to one of claims 1, 2 or 3, whereby the intermediate layer consists of small, polarizable molecules with internal dipole moment (e.g. disulfide dipole molecules) or of silanes, fullerenes or perylenes.

5. OFET according to claim 1 which has a threshold voltage in the range −

1V to −

10V.

6. OFET according to claim 1 wherein the semiconductive material of which is polyalkylthiophene.

7. OFET according to claim 1 wherein the intermediate layer has a thickness in the range 1 to 50 nm.

8. Use of the OFET according to claim 1 in an RFID tag, a sensor array, a photovoltaic cell, as a “

wearable electronic”

, as an active display, as an electronic bar code for consumer goods, as an electronic watermark, as an electronic stamp, as a baggage label and/or as an electronic ticket. Add The Following claims;

9. Use of the OFET according to claim 2 in an RFID tag, a sensor array, a photovoltaic cell, as a “

wearable electronic”

, as an active display, as an electronic bar code for consumer goods, as an electronic watermark, as an electronic stamp, as a baggage label and/or as an electronic ticket.

10. Use of the OFET according to claim 3 in an RFID tag, a sensor array, a photovoltaic cell, as a “

wearable electronic”

, as an active display, as an electronic bar code for consumer goods, as an electronic watermark, as an electronic stamp, as a baggage label and/or as an electronic ticket.

11. Use of the OFET according to claim 4 in an RFID tag, a sensor array, a photovoltaic cell, as a “

wearable electronic”

, as an active display, as an electronic bar code for consumer goods, as an electronic watermark, as an electronic stamp, as a baggage label and/or as an electronic ticket.

12. Use of the OFET according to claim 5 in an RFID tag, a sensor array, a photovoltaic cell, as a “

wearable electronic”

, as an active display, as an electronic bar code for consumer goods, as an electronic watermark, as an electronic stamp, as a baggage label and/or as an electronic ticket.

13. Use of the OFET according to claim 6 in an RFID tag, a sensor array, a photovoltaic cell, as a “

wearable electronic”

, as an active display, as an electronic bar code for consumer goods, as an electronic watermark, as an electronic stamp, as a baggage label and/or as an electronic ticket.

14. Use of the OFET according to claim 7 in an RFID tag, a sensor array, a photovoltaic cell, as a “

wearable electronic”

, as an active display, as an electronic bar code for consumer goods, as an electronic watermark, as an electronic stamp, as a baggage label and/or as an electronic ticket.