Organic Nonvolatile Memory Devices and Materials

Organic nonvolatile memory devices leverage carbon-based semiconductors and functional dielectrics to store information without power. These systems commonly employ organic field-effect transistors or flash architectures, in which charges are written, retained and erased within floating gates, electret layers or intrinsic trap sites. Materials such as conjugated polymers, small molecules and nanocomposites are chosen for their processability, mechanical flexibility and tunable electronic properties. Key performance metrics include a wide memory window, low programming voltage, long retention time and high cycle endurance. Advances in solution processing and low-temperature deposition have enabled devices on flexible and unconventional substrates, opening pathways to wearable, foldable and disposable electronics. Hybrid heterostructures, ferroelectric polymers and nanoparticle-enhanced dielectrics further enrich design strategies, while photo-responsive elements introduce orthogonal programming methods. Together, these developments point towards scalable, low-cost memory technologies compatible with large-area and flexible platforms.

Research from Nature Portfolio

One study introduced a tunable flash memory device fabricated entirely below 200 °C in ambient conditions using spin-coated inorganic dielectrics that inherently combine high trap density with low leakage. By eliminating separate tunnelling and blocking layers, the device achieves intrinsic charge trapping densities exceeding 10¹² cm⁻² and leakage currents below 10⁻⁷ A cm⁻², with systematically adjustable storage capacity up to 96 %. Another work demonstrated ultra-flexible organic flash memories on polymer substrates via initiated chemical vapour deposition of dual polymer dielectric layers. These bendable memories, with a bending radius down to 300 µm, exhibit retention comparable to industry benchmarks and write voltages aligned with current standards. A third contribution employed ultrathin interfacial oxide layers to sandwich a low-coercive ferroelectric polymer in a flexible ferroelectric OFET. This architecture reduces operating voltages to as low as 4 V while maintaining high mobility, endurance over thousands of cycles and stable retention, even under repeated bending.

Organic Nonvolatile Memory Devices and Materials publication trend

The graph below shows the total number of articles in organic nonvolatile memory devices and materials across all publications each year (not limited to Nature Index journals).

Technical terms

Organic field-effect transistor (OFET): A transistor using organic semiconductors to modulate current flow via an applied gate voltage.

Floating gate memory: A flash memory structure where charges are stored on a conductive layer isolated by dielectric barriers.

Electret: A dielectric material with quasi-permanent electric polarization used to trap and retain charges.

Charge trapping: The capture and retention of charge carriers in localized energy states within a dielectric or at interfaces.

Retention time: The duration over which stored charges remain without significant degradation, defining nonvolatility.

References

1. Low temperature below 200 °C solution processed tunable flash memory device without tunneling and blocking layer. Nature Communications (2019).
2. Organic flash memory on various flexible substrates for foldable and disposable electronics. Nature Communications (2017).
3. Excellent low-voltage operating flexible ferroelectric organic transistor nonvolatile memory with a sandwiching ultrathin ferroelectric film. Scientific Reports (2017).
4. Nanographene‐Based Heterojunctions for High‐Performance Organic Phototransistor Memory Devices. Advanced Science (2023).
5. Recent Advances in Organic Phototransistors: Nonvolatile Memory, Artificial Synapses, and Photodetectors. Small Science (2022).