Ambipolar Charge Carrier Transport of Organic Semiconductor-Based Heterojunction Bilayers
발표자
최소현 (인하대학교)
연구책임자
양회창 (인하대학교)
초록
내용
This study evaluates ambipolar organic thin film transistors (OTFTs) and complementary-like inverters using PTCDI-C13and pentacene bilayers deposited sequentially on a polymer-grafted SiO2 dielectric. As the underlying layers in semiconductor heterojunction bilayers (HJBs), PTCDI-C13 crystallites with a nominal thickness of 4 monolayers (ML) were deposited and reorganized thermally. Finally, the crystal growth of pentacene was intermediated on the PTCDI-C13 crystallites. Semiconductor HJBs clearly exhibited ambipolar charge-carrier transport, and the ambipolar OTFTs exhibited various hole (mh) and electron (me) mobilities of 0.10-0.75 and 0.013-0.55 cm2 V-1 s-1, respectively, depending on the p-conjugated structures of the semiconductors. The terrace-like crystal growth of pentacene could be intermediated on the smooth layered crystallites of PTCDI-C13. Complementary-like inverters using two ambipolar OTFTs yielded a high voltage gain of up to 80.