Nanopaper‐Based Organic Inkjet‐Printed Diodes

Abstract

The rise of internet of things (IoTs) applications has led to the development of a new generation of light‐weight, flexible, and cost‐effective electronics. These devices and sensors have to be simultaneously easily replaceable and disposable while being environmentally sustainable. Thus, the introduction of new functionalized materials with mechanical flexibility that can be processed using large‐area and facile fabrication methods (as, for example, printing technologies) has become a matter of great interest in the scientific community. In this context, cellulose nanofibers (CNFs) are renewable, affordable, robust, and nontoxic materials that are rapidly emerging as components for eco‐friendly electronics. Their combination with conductive polymers (CPs) to obtain conductive nanopapers (CNPs) allows moving their functionality from just substrates to active components of the device. In this work, a route for the inkjet‐printing of organic diodes is outlined. The proposed strategy is based on the use of CNPs as both substrates and bottom electrodes onto which insulator and organic semiconducting layers are deposited to fabricate novel diode structures. Remarkable rectification ratios of up to 1.2 × 103 at |3 V| and a current density up to 5.1 µA cm−2 are achieved. As a proof‐of‐concept of the potentiality of the approach for versatile, low‐temperature, and disposable sensing applications, an NO2 gas sensor is presented.

Leveraging Process Fundamentals to Improve Semiconductor Thickness Control and Uniformity in Inkjet-Printed Schottky Diodes

“…The diodes exhibit minimal hysteresis and a low turn-on voltage of ∼0.3 V. Rectification ratios as high as 4.0 × 10 4 at ±1 V were achieved. These results are comparable to or better than other diodes demonstrated in the literature. ,,− Higher rectification ratios up to 10 6 have been reported for printed organic diodes by using higher-mobility semiconductors . However, the processing principles described in the current study can be translated and applied toward other solution-processed materials systems.…”

Electrosynthesis of Au nanocluster embedded conductive polymer films at soft interfaces using dithiafulvenyl-functionalized pyrene

“…Next, the Au substrate coated with the Au nanocluster/poly-bis(DTF)pyrene composite shows a different i-V response which demonstrates negative resistance that resembles organic tunnel diodes as shown recently for organic semiconductors. [49][50][51][52] Nevertheless, performing the ohmic linear curve fitting one obtains a resistance of ∼72 Ω. Based on this initial i-V profile, the film is likely an organic semiconductor; however, more work beyond the scope presented here needs to be done to characterize this property.…”

Study of Single and Multipass f–rGO Inkjet-Printed Structures with Various Concentrations: Electrical and Thermal Evaluation

“…Typically, most flexible printed electronic applications are based on organic or polymer inks, due to their characteristics such as conductivity, electrical and mechanical stability, and compatibility with a variety of substrates [ 23 , 24 ], while maintaining biocompatibility [ 25 , 26 , 27 ]. Nevertheless, it is important to measure and accurately define the optimal conditions for printing conductive lines using inkjet; there have been various efforts towards accurately measuring the resistivity of inkjet-printed structures [ 28 , 29 ], mainly because they are used for interconnections [ 30 , 31 ], electrode fabrication [ 32 ], etc.…”