Design of rewritable and read-only non-volatile optical memory elements using photochromic spiropyran-based salts as light-sensitive materials

Abstract

Optical memory devices based on photoswitchable OFETs comprising light sensitive layers of photochromic spiropyran salts revealed advanced electrical characteristics and superior stability.

Photocontrolled organic field effect transistors based on the fullerene C60 and spiropyran hybrid molecule

“…5 Simultaneously, the introduction of a photosensitive lm (e.g., based on hetarylethenes, spirophotochromes, or azobenzene) at the boundary between the semiconductor (fullerene) and insulator layers may give low-voltage photocontrolled OFETs and provide a promising approach to multibit optical memory devices possessing good electrical characteristics and operation stability and reliability. This approach is currently actively used by various researchers, [6][7][8][9][10][11] but the fabrication of devices is quite costly. Furthermore, the switching efficiency decreases as a result of photodegradation of the photochromic molecule and the presence of a large number of layers, which reduces the number of photons that reach the photochromic molecule.…”

Simultaneous Optical Tuning of Hole and Electron Transport in Ambipolar WSe2 Interfaced with a Bicomponent Photochromic Layer: From High‐Mobility Transistors to Flexible Multilevel Memories

“…Additionally, by taking advantage of the thermal bistability of DAE molecules in both photoisomeric states, the device is shown to possess a prolonged retention time exceeding 20 days in the dark. This result outperforms the current state‐of‐the‐art memories based on other photochromic molecules, such as spiropyrans and azobenzenes, and is highly promising for applications as nonvolatile memories . Remarkably, taking full advantage of the superior mechanical properties of ultrathin 2D WSe 2 , our device is also able to be operated on a flexible and transparent poly(ethylene terephthalate) (PET) substrate, without losing its optical switching capability, which is attractive for future generation of multifunctional wearable electronics.…”

Preparation of Reversible Photoresponsive Poly(SPA‐co‐MMA) Films by Electrospinning: A Possible Route to Smart Materials for Regulating Wettability and Humidity

“…Therefore, the photoresponsive organic molecules provide an abundant source for the fabrication of photoresponsive materials with controllable wettability . Presently, spiropyran and its derivatives are the most attractive organic photoisomerized compounds exhibiting thermo, photo, and acidic properties, they have been studied extensively for applications in optical switches, molecular force probes, memories, and displays . There is a reversible transition from the closed nonpolar form (spiropyran form) to the open polar form (merocyanine form) under different wavelength light irradiation.…”