heterostructures by combining versatile semiconducting materials is an effective strategy to realize wide photosensitive synapses. [15][16][17] Previous studies have shown that a series of wideband synaptic electronics from heterostructures, including CNTs/CsPbBr 3 -QDs, CdS/ZnSnO, and PEA 2 SnI 4 /Y 6 , have been proposed to simulate visual learning, image recognition, and information memorization. [2,18,19] As a typical wide-gap semiconducting material, II-VI group metal oxides, particularly ZnO, with a wide direct bandgap (3.4 eV), have been widely utilized in photodetection due to their high UV sensitivity, outstanding mobility, and fast response speed, making them possible for emulating light-tunable synaptic plasticity. [20][21][22][23][24] For instance, Guo et al. reported photoelectric memristive synapses using a ZnO 1−x /AlO y heterobilayer, and the synaptic behaviors were attributed to traps for photogenerated holes provided by AlO y . [25] Kim et al. designed an alloxide-based photonic neuromorphic by sputtering In 2 O 3 onto ZnO to imitate synaptic behaviors, such as short-and long-term plasticity. [26] However, the wide bandgap endows ZnO with only a response to UV light, which limits the horizon of ZnO in the broad photosensitive region. [27][28][29] On the other hand, these ZnO-based heterostructures are normally prepared by a complex process, such as chemical vapor deposition and sputtering deposition, which also impedes their low-cost production. Organic-inorganic hybrids are promising candidates to achieve broad photonic synapses by full solution process. [30] However, a few imperfections are present in hybrid organic-inorganic systems, such as inherent instability and inefficient mobility from traditional organic components, making it hard to obtain highly stable and efficient artificial synapses. Crosslinked conjugated polymers (CCPs), as novel semiconductor materials, have tunable structures and unique optical properties. [31][32][33][34] In these cases, chemical crosslinking by covalent bonds, ensures the formation of a strong network framework for excellent air and thermal stability, which make them possible for use in harsh conditions, such as space and high-temperature environments. [35] We envision that combining cross-linked polymers with inorganic oxides to form heterostructures may provide high-performance synaptic optoelectronics with robust stability.Here, we describe an organic-inorganic hybrid photosensitive heterostructure by in situ growing CCP onto ZnO Hybrid heterostructures are promising neurotransmitter platforms for photonic synapses in bioinspired optoelectronics. Organic-inorganic heterostructures have the features of a wide photoresponse and wet synthesis but still face poor stability and limited comprehensive performance. Here, it has been reported ultrastable and broadband photonic synaptic behaviors from solution-processed cross-linked conjugated polymer/zinc oxide nanorod heterostructures, which can be formed by in situ polymerization and hydrothermal methods. Light-...
Due to their excellent ionic conductivity, stretchability, and self-healing property, elastic ionic conductors have shown great promise for the development of flexible electronics. However, for the ionic pressure sensors, how to enhance their sensitivity and broaden their detectable range is still a challenge. Here, we develop a simple one-step method to prepare foamy structure ionic conductors, that is, ionic conductive foams (ICFs), for high-performance ionic sensing applications. The typical porous structures were constructed through a simple gas foaming technique. The asprepared ICFs combine the advantages of light-weight, stretchable, and self-healing properties. Interestingly, attributed to the porous structure feature, the ICF-based pressure sensor exhibited a high sensitivity (5.23 kPa −1 ), a broad detection range (from 0.1 to 100 kPa), excellent stability, and long-time durability. Moreover, adaptive monitoring of large and tiny pressure changes is also brought out to detect various human motions. This universal classification of ionic conductor is expected to be a promising candidate for flexible device applications in different conditions.
Organic memories typically comprise memristive polymer mediums sandwiched between two electrodes, with the advantages of wet manufacturing and modulated function. However, the issues associated with structural instability, low-speed switch, and hard pattern in polymeric memories are the main obstacles towards practical uses. Here, we present an ultrastable and fast-speed memory array that uses amorphous polymer nanofilm with light-/steam-driven crosslinked porous multistructure as memristive materials. The polymer diode shows nonvolatile rewritable flash memory characteristics, with a high ON/OFF ratio, long retention time, and high speeds of set (70 ns) and reset (845 ns) operations. Impressively, the memory cell undergoes harsh conditions in ultraviolet irradiation and extreme temperatures. By rationally integrating the array with target sensors, an artificial sensory memory architecture is constructed to mimic visual/ thermal perception and recording, demonstrating great potential for biomimetic neuromorphic electronics. Our results advance a commercial perspective on memristive organics capable of integration patterns and high performance.
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