Park, Junsu Kim, Minseok Yeom, Seung-Won Ha, Hyeon Jun Song, Hyenggun Jhon, Young Min Kim, Yun-Hi Ju, Byeong-Kwon 2024-01-20T04:02:24Z 2024-01-20T04:02:24Z 2021-09-05 2016-06-03 0957-4484 https://pubs.kist.re.kr/handle/201004/123973 We report ambipolar organic field-effect transistors and complementary inverter circuits with reverse-offset-printed (ROP) Ag electrodes fabricated on a flexible substrate. A diketopyrrolopyrrole-based co-polymer (PDPP-TAT) was used as the semiconductor and poly (methyl methacrylate) was used as the gate insulator. Considerable improvement is observed in the n-channel electrical characteristics by inserting a cesium carbonate (Cs2CO3) as the electron-injection/hole-blocking layer at the interface between the semiconductors and the electrodes. The saturation mobility values are 0.35 cm(2) V-1 s(-1) for the p-channel and 0.027 cm(2) V-1 s(-1) for the n-channel. A complementary inverter is demonstrated based on the ROP process, and it is selectively controlled by the insertion of Cs2CO3 onto the n-channel region via thermal evaporation. Moreover, the devices show stable operation during the mechanical bending test using tensile strains ranging from 0.05% to 0.5%. The results confirm that these devices have great potential for use in flexible and inexpensive integrated circuits over a large area. English IOP PUBLISHING LTD POLYMER TRANSPORT INJECTION DISPLAYS Flexible ambipolar organic field-effect transistors with reverse-offset-printed silver electrodes for a complementary inverter Article 10.1088/0957-4484/27/22/225302 1 NANOTECHNOLOGY, v.27, no.22 NANOTECHNOLOGY 27 22 scie scopus 000374767500010 2-s2.0-84965022915 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Science & Technology - Other Topics Materials Science Physics Article POLYMER TRANSPORT INJECTION DISPLAYS printed electronics reverse offset printing ambipolarity organic semiconductor field-effect transistors complementary inverter