Over the last 20 years, tremendous progress has been achieved in the design and fabrication of organic electronic devices. High performance LEDs, transistors, and memory devices—the materials science journals have it all! Follow the continuing progress and the latest breakthroughs in the field of organic electronics in our top-quality journals.
High-Performance Organic Field-Effect Transistors
Adv. Mater., DOI: 10.1002/adma.200802733
Organic electrochemical transistors (OECTs) are transistors that can have extrinsic transconductances as high as 400 S m−1, but they typically have response times on the order of 1 ms or longer. These response speeds are limited by ion transport. It is shown that OECTs can exceed the ionic response speed by a factor of 30 when operated in a high-speed bias regime.
Jacob T. Friedlein, Mary J. Donahue, Sean E. Shaheen, George G. Malliaras, Robert R. McLeod
Adv. Mater., July 26, 2016, DOI: 10.1002/adma.201602684. Read article
The operation mechanism and performance of organic vertical field effect transistors (VFETs) have been investigated. Several key factors are identified such as source/drain electrode widths, source contact resistance, and bottom active layer thickness. With the key parameters, the proposed VFET shows greater performance than conventional organic field-effect transistors with lateral channel in terms of driving capability.
Hyukyun Kwon, Mincheol Kim, Hyunsu Cho, Hanul Moon, Jongjin Lee, Seunghyup Yoo
Adv. Funct. Mater., July 21, 2016, DOI: 10.1002/adfm.201601956. Read article
Taking the π-conjugated polymers PBDT[2X]T (X = H, F) as model systems, the effects of fluorine substitution on main-chain conformations, packing, and electronic couplings are examined. Our combination of molecular dynamics simulations and solid-state NMR shows that a higher propensity for backbone planarity in PBDT[2F]T leads to more pronounced, yet staggered, chain stacking, which generally leads to higher electronic couplings and binding energy between neighboring chains.
Khanh Do, Qasim Saleem, Mahesh Kumar Ravva, Federico Cruciani, Zhipeng Kan, Jannic Wolf, Michael Ryan Hansen, Pierre M. Beaujuge, Jean-Luc Brédas
Adv. Mater., July 14, 2016, DOI: 10.1002/adma.201601282. Read article
A pendant polymer with bio-derived redox units is designed for lithium-ion battery cathodes. With a working voltage of ≈2.5 V versus Li/Li+, it can deliver a high capacity of 125 mAh g−1 at 14.4 mA g−1. Using a semi-synthetic approach for designing pendant redox-active polymers is an attractive strategy for the development of energy storage materials.
Tyler B. Schon, Andrew J. Tilley, Colin R. Bridges, Mark B. Miltenburg, Dwight S. Seferos
Adv. Funct. Mater., July 14, 2016, DOI: 10.1002/adfm.201602114. Read article
Molecular transport junctions (MTJs) are important components in molecular electronic devices. However, the synthesis of MTJs remains a significant challenge, as the dimensions of the junction must be tailored for each experiment, based on the molecular lengths. A novel methodology is reported for forming MTJs, taking advantage of capillary and van der Waals forces.
Jong Kuk Lim, One-Sun Lee, Jae-Won Jang, Sarah Hurst Petrosko, George C. Schatz, Chad A. Mirkin
Small, July 01, 2016, DOI: 10.1002/smll.201601214. Read article
Acene from a condensation: Four different bent benzo[a]naphtho[2,3-i]phenazines are efficiently synthesized by condensation of aromatic diamines with 1,2-naphthalenedione. The resultant azaacenes are spectroscopically and crystallographically characterized. Optical properties are studied and compared with those of the isomeric linear azaacenes.
Sebastian Hahn, Philipp Biegger, Markus Bender, Frank Rominger, Uwe H. F. Bunz
Chem. Eur. J., December 11, 2015, DOI: 10.1002/chem.201503856. Read article.