Tuning Absorption State and Intermolecular Potential of Organic Semiconductors for Narrowband Ultraviolet Photodetection.
basic_science · Level V
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- Record sourced from PubMed, PMID 39916537.
- Also identified by DOI 10.1002/adma.202414589.
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Abstract
Narrowband response of organic semiconductors determines the band selectivity and anti-interference of the organic photodetectors, which are pursued for a long time but have not yet been resolved in the UV band. Herein, a feasible strategy is developed to realize narrowband UV response by tuning the absorption state and intermolecular potential of organic semiconductors. The as-designed non-Donor-Acceptor molecule, 2,5-diphenylthieno[3,2-b]thiophene (2,5-DPTT), exhibits narrowband absorption by fully suppressing the charge transfer state absorption. Simultaneously, the intermolecular potential is significantly enhanced (to ≈90 KJ mol<sup>-1</sup>) by modulating the molecular planarity. Consequently, the UV photodetector based on 2,5-DPTT achieves excellent narrowband response at 310 nm wavelength and a record-breaking photosensitivity (P = 1.21 × 10<sup>6</sup>) in the deep UV range. In the demonstration application of flame alarm, the flame detector based on 2,5-DPTT single crystal exhibits excellent anti-interference capability. This work provides the inspiration for designing narrowband responsive organic semiconductors and building up multifunctional optoelectronic devices.