MRSEC Seminar

Organic and Polymer Transistors:
Performance Characteristics and Applications

Dr. Ananth Dodabalapur

Microelectronics Research Center
The University of Texas at Austin

Thursday, November 1, 2:00 pm

Tech F235

The talk will begin with a summary of the evolution of field-effect mobility over the past decade for different classes of materials: small molecule films (n-channel and p-channel), polymer films, and single crystals. This will be followed by a comparison of the field-effect mobility with the drift mobility. The drift mobility and velocity has been measured in both polymers and small molecule semiconductors using both time-domain and frequency domain measurements. The results show that the drift mobility is indeed comparable to the field-effect mobility. We also observe a small reduction in drift mobility with time (over time scales between 100 ns and 1 s), consistent with charge trapping, also known as the bias-stress effect.

The second half of the talk will be devoted to a discussion of some of the applications of organic and polymer transistors; in particular how improvements in semiconducting and insulator materials have led to greater promise of their use in applications. Over the past decade, many applications have been proposed for organic transistors including: RFID tags, flexible display backplanes, in active matrix LED displays, in logic circuits, and is sensors of various kinds. We will review recent progress in three key applications areas: RFID tags, complementary circuits, and chemical sensors.

Host: Professor Tobin Marks, Chemistry