Thermal annealing and temperature dependences of memory effect in organic memory transistor

Abstract

We investigate the annealing and thermal effects of organic non-volatile memory with floating silver nanoparticles by real-time transfer curve measurements. During annealing, the memory window shows shrinkage of 23% due to structural variation of the nanoparticles. However, by increasing the device operating temperature from 20 to 90 °C after annealing, the memory window demonstrates an enlargement up to 100%. The differences in the thermal responses are explained and confirmed by the co-existence of electron and hole traps. Our findings provide a better understanding of organic memory performances under various operating temperatures and validate their applications for temperature sensing or thermal memories.

High-Density Single-Layer Coating of Gold Nanoparticles onto Multiple Substrates by Using an Intrinsically Disordered Protein of α-Synuclein for Nanoapplications

“…Advantages of the NP-based OFET memory are suggested to exhibit not only fast data access and high storage density but also controllability over charge trap density and distribution . Many strategies have been introduced to integrate metal NPs into electrical memories by employing charge interaction, thermal evaporation, layer-by-layer assembly, block copolymer self-assembly, and microcontact printing. − Nonetheless, the need for a novel method has been realized to achieve large-area tight packing of metal NPs onto organic substrate to exert the high-density charge trapping of a flexible memory device.…”

Role of Evaporated Silver Nanoparticles in Organic Field-Effect Transistor: Electrical Effects and Dependence on the Size

“…The electrical effects of metal NPs can depend on the nature of a single nanoparticle, similar to the optical effects. According to the previous study, silver (Ag) NPs have many advantages when compared with other metal NPs, such as low production costs, easier fabrication, and controllable morphology. − Various morphologies of Ag-NPs can be tailored just via evaporation thickness and thermal annealing. , In this paper, we have controlled particle size and size distribution of the Ag-NPs by preparing different evaporation thicknesses and different thermal annealing times at 200 °C separately and report the correlation between Ag-NPs structure and the related electrical parameters.…”

“…18−23 Various morphologies of Ag-NPs can be tailored just via evaporation thickness and thermal annealing. 18,21 In this paper, we have controlled particle size and size distribution of the Ag-NPs by preparing different evaporation thicknesses and different thermal annealing times at 200 °C separately and report the correlation between Ag-NPs structure and the related electrical parameters.…”

Solvent Vapor Annealing Guides Molecules to Form a Desired Stacking Mode According to the Characteristics of the Molecular Structure

“…In recent years, organic semiconductor materials have attracted extensive research interest because of their great advantages in terms of definite molecular structure, easy purification, flexibility, low cost, and so forth. − It is well known that the carrier mobility largely depends on the intermolecular stacking style in fabricated films. − Large amounts of small molecules have been designed and synthesized to discuss the effects of molecular planarity, − conjugated length, − distortion of the conjugate skeleton, − flexible side-chain length, − and different heteroatom groups − on the intermolecular stacking; this molecular structure innovation is always looked as a comprehensive and complex task with a long-term synthesis process and is laborious. Therefore, various thin-film postprocessing techniques such as thermal annealing (TA) have been studied to improve the intermolecular stacking, which is considered as a simple and effective method, but TA is blind to promote the ordered arrangement of molecules and cannot guide molecules to form a desired stacking mode according to the characteristics of the molecular structure. − Recently, the solvent vapor annealing (SVA) technique has been tried to be used in the preparation of organic photovoltaic devices and field-effect transistor devices to carry out thin-ilm post-processing to improve the molecular alignment state, which can select a suitable solvent for the molecular structure to induce the desired molecular alignment. − …”