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Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →A flash-driven chemical reaction has produced two sulfur- and nitrogen-containing organic semiconductors, and the linear form could transport positive charge about five times more effectively than its bent counterpart in theoretical calculations. The result, from Osaka Metropolitan University, points to a materials-design route for flexible electronics—but it is not yet a working display or sensor.
What the flash of light actually does
The light is not powering a finished electronic device. It is triggering the synthesis of the semiconductor molecules themselves. When the precursor absorbs light, it passes through short-lived intermediate states. Those intermediates create new carbon–carbon bonds and fold the molecule into a compact annulated ring structure containing a thiazole unit.
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By changing the irradiation conditions, the team could control the product distribution. Some conditions produced a mixture of the two isomers, while another set favored the bent molecule selectively. This ability to steer the reaction with light is important because molecular shape ultimately affects how molecules pack into a crystal and how charge moves through that crystal.
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The work was led by Takuya Ogaki and Hiroshi Ikeda at Osaka Metropolitan University. The study, “p-Type Organic Semiconductors With an Annulated Thiazole: Photochemical Synthesis and Theoretically High Hole Mobility Predicted From Crystal Structure,” was published in Chemistry – A European Journal in 2026 (DOI 10.1002/chem.71361).
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b-DNT and l-DNT: two shapes of the same design
The products are called b-DNT and l-DNT. They are isomers: molecules built from the same overall chemical design but arranged differently. b-DNT has a bent geometry, whereas l-DNT is more linear. Both contain sulfur and nitrogen atoms and form tightly packed molecular crystals.
| Feature | b-DNT | l-DNT |
|---|---|---|
| Molecular geometry | Bent | Linear |
| Crystal arrangement | Tightly packed, with sulfur–sulfur and sulfur–nitrogen interactions; less overlap along charge-transport pathways than l-DNT | Tightly packed, with sulfur–sulfur and sulfur–nitrogen interactions and greater overlap along charge-transport pathways |
| Predicted hole mobility | Absolute value not stated in the report; used as the comparison baseline | Approximately five times b-DNT, based on crystal-structure calculations |
| Product control under irradiation | Can be favored selectively by adjusting irradiation conditions | Can appear with b-DNT when conditions produce an isomer mixture; a selective l-DNT condition was not established in the report |
Here, “p-type” means that the relevant mobile carriers are holes—effectively the absence of electrons in the material’s electronic structure. Hole mobility describes how readily those carriers move through the semiconductor.
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Why the linear isomer is predicted to carry charge better
Charge transport in an organic crystal depends not only on the isolated molecule but also on the way neighboring molecules face one another. The team found that both isomers assemble into compact crystals stabilized by sulfur–sulfur and sulfur–nitrogen contacts. In l-DNT, however, the linear shape creates more effective overlap between adjacent molecules in the directions where holes can travel.
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Greater orbital overlap gives a carrier a more continuous route from one molecule to the next. Density-functional-theory calculations based on the measured crystal structures therefore predicted a hole mobility for l-DNT roughly five times that of b-DNT. The calculated value was described as comparable to those of leading organic-semiconductor materials.
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That “five times” figure is a theoretical comparison, not a device measurement. It does not establish that a transistor made from l-DNT will deliver five times the current, speed or battery life of a device made from b-DNT.
How the reaction pathway was reconstructed
The intermediates formed after the light pulse exist only briefly, so ordinary product analysis cannot show the complete sequence. The researchers combined several techniques:
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- Laser flash photolysis: a short light pulse initiated the reaction.
- Nanosecond absorption spectroscopy: transient absorption signals revealed the fleeting intermediate species after irradiation.
- Crystal-structure analysis: the final b-DNT and l-DNT arrangements showed how each isomer packs in the solid state.
- Density-functional-theory calculations: computational models connected the observed structures with the reaction pathway and estimated hole-transport properties.
Together, these measurements support a mechanism in which light-generated intermediates make the new carbon–carbon bonds before the precursor closes into the annulated structure.
Could these molecules enable bendable displays or wearable sensors?
They are promising candidates, not finished components. Associate Professor Yasunori Matsui said lightweight and flexible organic semiconductors of this kind could be useful in bendable displays and wearable sensors. The molecules’ organic composition and the ability to tune their structure photochemically make them relevant to that direction.
However, the reported study does not demonstrate a display pixel, sensor circuit or flexible transistor. It also does not report finished-device efficiency, operating lifetime, manufacturing yield or commercial cost. The approximately five-fold mobility advantage comes from calculations on crystal structures rather than measurements from an operating device.
What must happen before practical electronics
Turning the molecular result into hardware would require measurements that are outside the reported work, including:
- fabricating and electrically testing thin-film transistors or other devices;
- measuring mobility in the actual processed film, where disorder and grain boundaries can reduce transport;
- checking stability under light, heat, air and repeated bending;
- establishing reproducible, scalable synthesis and film deposition; and
- comparing performance with established organic-semiconductor materials in the same device architecture.
Those tests will determine whether l-DNT’s crystal-level advantage survives processing and real operating conditions.
Why this approach matters
The advance is the combination of two ideas: a clean, light-triggered synthesis and molecular design that deliberately includes a thiazole unit and controls the final shape. Instead of treating photochemistry only as a way to make a compound, the team used irradiation conditions to influence which isomer formed, then linked each isomer’s crystal packing to its predicted transport behavior.
The immediate outcome is a pair of well-characterized semiconductor candidates and a mechanistic explanation for their different performance. The broader opportunity is a repeatable design strategy: use light to build compact heterocyclic molecules, determine how they pack, and select structures whose intermolecular overlap favors charge transport.
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