Large‐Area Flexible Memory Arrays of Oriented Molecular Ferroelectric Single Crystals with Nearly Saturated Polarization

Abstract

Molecular ferroelectrics (MFs) have been proven to demonstrate excellent properties even comparable to those of inorganic counterparts usually with heavy metals. However, the validation of their device applications is still at the infant stage. The polycrystalline feature of conventionally obtained MF films, the patterning challenges for microelectronics and the brittleness of crystalline films significantly hinder their development for organic integrated circuits, as well as emerging flexible electronics. Here, a large‐area flexible memory array is demonstrated of oriented molecular ferroelectric single crystals (MFSCs) with nearly saturated polarization. Highly‐uniform MFSC arrays are prepared on large‐scale substrates including Si wafers and flexible substrates using an asymmetric‐wetting and microgroove‐assisted coating (AWMAC) strategy. Resultant flexible memory arrays exhibit excellent nonvolatile memory properties with a low‐operating voltage of <5 V, i.e., nearly saturated ferroelectric polarization (6.5 µC cm−2), and long bending endurance (>103) under various bending radii. These results may open an avenue for scalable flexible MF electronics with high performance.

Organic Semiconductor Single Crystal Arrays: Preparation and Applications

“…They also provided a presentation of the programmable memory performance of the NVM array (Figure 20c), confirming the capability for programmable nonvolatile memory function. [ 82 ] In addition, high frequency devices are very important for long distance wireless communication. Bilayer (2L) OSSC based OFET with a channel length of 50 µm displays an outstanding mobility of more than 10 cm 2 V −1 s −1 , and low contact resistance as low as 50 Ω cm.…”

“…Reproduced with permission. [ 82 ] Copyright 2022, Wiley‐VCH. d) Frequency dependence of the rectified output voltage ( V out ) normalized with respect to the value at 100 kHz.…”

“…Yellow regions represent the 1 state and blue regions represent the 0 state, respectively. Reproduced with permission [82]. Copyright 2022, Wiley-VCH.…”

Chlorocholine Perchlorate is an Organic Ferroelectric with Two‐Step Ladder‐like Dielectric, Second Harmonic Generation Effects, and Ferroelectricity

“…For the past few decades, the exploration of molecular ferroelectrics has received more and more attentions, quasi-spherical theory, [13,14] homochirality and H/F substitution [15] have been developed to direct the targeted design of molecular ferroelectrics with high phase transition temperature(Tc) and large spontaneous polarization (Ps). [16][17][18] One of the most important issues in designing molecular ferroelectrics is to combine with multiple bistable physical properties in one molecule to realize 'multi-in-one'. Just like molecular machines which could achieve specific tasks by responding to external stimuli, have gradually come to be regarded as powerful tools for a wide range of applications.…”