Two‐Dimensional Boronate Ester Covalent Organic Framework Thin Films with Large Single Crystalline Domains for a Neuromorphic Memory Device. Issue 21 (19th March 2020)

• Record Type: Journal Article
• Authors: Park, SangWook; Liao, Zhongquan; Ibarlucea, Bergoi; Qi, Haoyuan; Lin, Hung‐Hsuan; Becker, Daniel; Melidonie, Jason; Zhang, Tao; Sahabudeen, Hafeesudeen; Baraban, Larysa; Baek, Chang‐Ki; Zheng, Zhikun; Zschech, Ehrenfried; Fery, Andreas; Heine, Thomas; Kaiser, Ute; Cuniberti, Gianaurelio; Dong, Renhao; Feng, Xinliang
• Is Part Of: Angewandte Chemie international edition. Volume 59:Issue 21(2020)
• Page Start: 8218
• Page End: 8224
• Publication Date: 2020-03-19
• Subjects: covalent organic framework -- 2D polymer -- interfacial synthesis -- neuromorphic memory device -- single crystal; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201916595
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: Despite the recent progress in the synthesis of crystalline boronate ester covalent organic frameworks (BECOFs) in powder and thin‐film through solvothermal method and on‐solid‐surface synthesis, respectively, their applications in electronics, remain less explored due to the challenges in thin‐film processability and device integration associated with the control of film thickness, layer orientation, stability and crystallinity. Moreover, although the crystalline domain sizes of the powder samples can reach micrometer scale (up to ≈1.5 μm), the reported thin‐film samples have so far rather small crystalline domains up to 100 nm. Here we demonstrate a general and efficient synthesis of crystalline two‐dimensional (2D) BECOF films composed of porphyrin macrocycles and phenyl or naphthyl linkers (named as 2D BECOF‐PP or 2D BECOF‐PN ) by employing a surfactant‐monolayer‐assisted interfacial synthesis (SMAIS) on the water surface. The achieved 2D BECOF‐PP is featured as free‐standing thin film with large single‐crystalline domains up to ≈60 μm 2 and tunable thickness from 6 to 16 nm. A hybrid memory device composed of 2D BECOF‐PP film on silicon nanowire‐based field‐effect transistor is demonstrated as a bio‐inspired system to mimic neuronal synapses, displaying a learning–erasing–forgetting memory process. Abstract : Mimicking synaptic plasticity : A free‐standing boronate ester‐linked 2D COF thin film has been achieved with record crystalline domain size as large as ≈60 μm 2 via an interfacial synthesis method. This film was integrated into an organic thin film/Si nanowire‐based field effect transistor to mimic neuronal synapses capable of learning–erasing–forgetting memory process.