Organic Semiconductors
Summary
Organic semiconductors are carbon-based materials featuring π-conjugated backbones that support charge transport through delocalised molecular orbitals. Unlike inorganic crystals, they form mechanically flexible, lightweight films processed at low temperatures from solution or vapour. Molecular design tunes optical absorption, frontier orbital energies and intermolecular packing to achieve field-effect mobilities up to several cm² V⁻¹ s⁻¹. Charge transport proceeds via hopping or band-like motion in crystalline domains, with polarons and excitons governing conduction and emission. Bulk heterojunction architectures in photovoltaics, light-emitting diodes and thin-film transistors harness tailored phase separation and interfacial energetics to deliver power conversion efficiencies above 18 %, high brightness and switching speeds compatible with portable, wearable and foldable electronics. Recent efforts focus on large-area manufacturing, device stability and integration with complementary technologies to unlock low-cost, high-performance flexible systems.
Research from Nature Portfolio
Recent studies have demonstrated wafer-scale monolithic integration of fully solution-processed organic transistors onto III–V micro-LED arrays. By depositing low-defect organic semiconductor and dielectric layers atop uneven LED surfaces in an “organic-last” approach, devices achieve milliampere-level driving currents, on/off ratios near 10¹⁰ and uniform reliability, enabling active-matrix micro-LED displays with record brightness (>150 000 nits) and pixel density (254 ppi). Foundational work on three-dimensional monolithic stacking has established scalable printing of dual-gate polymer transistors on flexible foil. High-yield, year-long stability in printed dual-gate devices supports programmable 3D logic arrays, mirroring inorganic scaling principles and pointing toward dense, high-performance organic circuits.
Organic Semiconductors publication trend
The graph below shows the total number of articles in organic semiconductors across all publications each year (not limited to Nature Index journals).
Technical terms
Organic thin-film transistor (OTFT): A transistor in which an organic semiconducting layer modulates current between source and drain electrodes under a gate voltage.
Charge-carrier mobility: The speed at which electrons or holes travel through a semiconductor under an electric field, determining device switching speed.
Solution processability: The ability to deposit semiconducting materials from liquid formulations via printing or coating techniques.
Bulk heterojunction (BHJ): A three-dimensional interpenetrating network of donor and acceptor materials that maximises interfacial area for exciton dissociation.
Monolithic integration: Sequential fabrication of multiple device layers on the same substrate to achieve compact, multilayered circuits.
References
- Wafer-scale organic-on-III-V monolithic heterogeneous integration for active-matrix micro-LED displays. Nature Communications (2023).
- Three-dimensional monolithic integration in flexible printed organic transistors. Nature Communications (2019).
- High Mobility Amorphous Polymer‐Based 3D Stacked Pseudo Logic Circuits through Precision Printing. Advanced Functional Materials (2024).
- Vertically stacked skin-like active-matrix display with ultrahigh aperture ratio. Light: Science & Applications (2024).
- High Throughput Characterization of Organic Thin Film Transistors. Advanced Materials (2024).
- Crystallisation-enhanced bulk hole mobility in phenothiazine-based organic semiconductors. Scientific Reports (2017).
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