Better Organic Ternary Memory Performance through Self‐Assembled Alkyltrichlorosilane Monolayers on Indium Tin Oxide (ITO) Surfaces

Abstract

Recently, surface engineering of the indium tin oxide (ITO) electrode of sandwich-like organic electric memory devices was found to effectively improve their memory performances. However, there are few methods to modify the ITO substrates. In this paper, we have successfully prepared alkyltrichlorosilane self-assembled monolayers (SAMs) on ITO substrates, and resistive random access memory devices are fabricated on these surfaces. Compared to the unmodified ITO substrates, organic molecules (i.e., 2-((4-butylphenyl)amino)-4-((4-butylphenyl)iminio)-3-oxocyclobut-1-en-1-olate, SA-Bu) grown on these SAM-modified ITO substrates have rougher surface morphologies but a smaller mosaicity. The organic layer on the SAM-modified ITO further aged to eliminate the crystalline phase diversity. In consequence, the ternary memory yields are effectively improved to approximately 40-47 %. Our results suggest that the insertion of alkyltrichlorosilane self-assembled monolayers could be an efficient method to improve the performance of organic memory devices.

Sustaining Electron Transfer Pathways Extends Biohybrid Photoelectrode Stability to Years

“…Scanning electron microscopy (SEM) revealed a structure formed from spherical cavities of � 800 nm diameter together with larger crevices (Figure 1a). To deposit RC-LH1 protein (Figure 1b) the electrode surface was cleaned in basic piranha solution to leave behind a hydroxyl-functionalized, [24] protein-friendly surface, [10] before multiple rounds of sequential immersion first in a solution of RC-LH1 complexes followed by a solution of cyt c. Successful adsorption of RC-LH1 complexes onto the IO-mITO electrode was apparent by eye (inset to Figure 1c). Reflectance spectra of coated electrodes showed distinctive features at 870, 805 and 600 nm attributable to the RC-LH1 BChls and a broad feature between 430 and 600 nm attributable to the RC-LH1 carotenoids (Figure 1c).…”

Ion‐in‐Conjugation: A Promising Concept for Multifunctional Organic Semiconductors

“…The fabrication of an ideal humidity sensor with a rapid response/recovery time, low hysteresis, good time stability, and robust reliability is important in health and environment monitoring. [60][61][62] Benefitting from the highly polar ionic fragments, IIC polymers have the advantages of small bandgaps, high crystallinity, strong affinity, and anticorrosion to water vapor. Poly(1-methylpyrrol-2-ylsquaraine) is synthesized to detect relative humidity (RH) ranging from 33% to 95%, and the response/recovery time is as low as 3/16 s. [24] To improve the performance further, different weight percentages of Au nanoparticles are loaded onto poly(1-phenylpyrrole-2-ylsquaraine) (PPPS).…”

“…[60] By further modifying the ITO substrate with alkyl trichlorosilane self-assembled monolayers, the ternary memory yields of SA-Bu are increased by approximately 40-47%. [61] To improve the contact between the grain boundaries and the electrode-active-layer interface for quaternary memory switching, a layer of poly(3,4-ethylenedioxythiophene)poly(styrene sulfonate) (PEDOT-PSS) is inserted between the ITO electrode and SA-Bu to form an ITO/PEDOT-PSS/SA-Bu/ Al architecture. [84] The inserted layer could significantly reduce the threshold voltage of each switching, leading to a reduction in the hole injection barrier from the active layer to the electrode, which increased the yield to approximately 41%.…”

Stabilisierung von Elektronentransferwegen erlaubt Stabilität von Biohybrid‐Photoelektroden über Jahre

“…Eine rasterelektronenmikroskopische (REM) Untersuchung zeigte eine Struktur aus kugelförmigen Hohlräumen mit einem Durchmesser von etwa 800 nm und größeren Spalten (Abbildung 1 a). Zur Funktionalisierung mit dem RC‐LH1‐Protein (Abbildung 1 b) wurde die Elektrodenoberfläche mit basischer Peroxomonoschwefelsäure‐Lösung behandelt, um eine hydroxylfunktionalisierte, [24] proteinfreundliche Oberfläche [10] zu erzeugen. Anschließend wurde die Elektrode in mehreren Durchgängen zunächst in eine Lösung mit RC‐LH1‐Komplexen und anschließend in eine Lösung mit Cyt c getaucht.…”