Provided is an electronic element that functions as a switch or memory without using metal nanoparticle. The electronic element includes: one electrode 5A and an other electrode 5B arranged to have a nanogap therebetween; and halide ion 6 provided between the electrodes 5A and 5B; and on one of the electrodes.

An organic molecular memory in an embodiment includes a first conducive layer, a second conductive layer, and an organic molecular layer provided between the first conductive layer and the second conductive layer, the organic molecular layer having an organic molecule, the organic molecule having a linker group bonded to the first conductive layer, a conjugated chain bonded to the linker group, and a phenyl group bonded to the conjugated chain opposite to the linker group and facing the second conductive layer, the conjugated chain including electron-accepting groups or electron-donating groups arranged in line asymmetry with respect to a bonding direction of the conjugate chain, the phenyl group having substituents R0, R1, R2, R3, and R4 as shown in the following formula, the substituent R0 being an electron-accepting group or an electron-donating group. ##STR00001##

Photopolymers, monomers, compositions including photopolymers and a dopant, and methods, including methods for eliciting a photomechanical response. The dopant may be a triplet sensitizing dopant. The exposing of compositions to the one or more wavelengths of electromagnetic radiation may elicit a photomechanical response via a triplet excited state mechanism.

The large-scale artificial synaptic device arrays based on the organic molecule-nanowire heterojunctions with tunable photoconductivity are proposed and demonstrated. The organic thin films of p-type 2,7-dioctyl[1]benzothieno[3,2-b][1] benzothiophene (C8-BTBT) or n-type phenyl-C61-butyric acid methyl ester (PC61BM) are used to wrap the InGaAs nanowire parallel arrays to configure two different type-I heterojunctions, respectively. Due to the difference in carrier injection, persistent negative photoconductivity (NPC) or positive photoconductivity (PPC) are achieved in these heterojunctions. The irradiation with different wavelengths (solar-blind to visible ranges) can stimulate the heterojunction devices, effectively mimicking the synaptic behaviors with two different photoconductivities. Evidently, these photosynaptic devices are illustrated with retina-like behaviors and capabilities for large-area integration, which reveals their promising potential for artificial visual systems.

A display device includes a plurality of islands and a bridge connecting the plurality of islands to each other. Each of the plurality of islands includes a flexible substrate, a thin film transistor positioned on a first surface of the flexible substrate, a first electrode connected to the thin film transistor, and a protective mask positioned on a second surface of the flexible substrate.