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Tissue Equivalent Curved Organic X-ray Detectors Utilizing High Atomic Number Polythiophene Analogues.

M Prabodhi A Nanayakkara¹, Qiao He², Arvydas Ruseckas³

¹Advanced Technology Institute, Department of Electrical and Electronic Engineering, University of Surrey, Guildford, Surrey, GU2 7XH, UK.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)

|November 2, 2023

Summary

High-Z heteroatom modification enhances organic semiconductor X-ray detectors. Selenium-containing organic detectors show superior sensitivity and flexibility, outperforming traditional nanoparticle-sensitized devices for advanced X-ray imaging applications.

Keywords:

flexible heteroatom organic electronics photonics x-ray detectors

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Area of Science:

Materials Science
Organic Electronics
X-ray Detection Technology

Background:

Organic semiconductors offer potential for X-ray detection but suffer from low X-ray absorption due to their low atomic number (Z).
Improving X-ray absorption and detection sensitivity in organic semiconductor-based devices is crucial for practical applications.

Purpose of the Study:

To develop high-sensitivity X-ray detectors using organic semiconductors modified with high-Z heteroatoms.
To investigate the impact of selenium heteroatoms on the performance of organic X-ray detectors.

Main Methods:

Fabrication of X-ray detectors using poly(3-hexyl)selenophene (P3HSe) blended with [6,6]-Phenyl C71 butyric acid methyl ester (PC70BM).
Characterization of detector performance under various X-ray radiation levels (70-220 kVp).
Evaluation of detector flexibility and dark current stability.

Main Results:

Heteroatom-containing organic detectors achieved a sensitivity of 600 ± 11 nC Gy⁻¹ cm⁻², surpassing Bi2O3 nanoparticle-sensitized detectors.
Enhanced electron-hole pair generation, charge transfer, and transport were observed in selenium-incorporated detectors.
Flexible detectors maintained performance after 100 bending cycles and exhibited an ultra-low dark current of 0.03 ± 0.01 pA mm⁻².

Conclusions:

Incorporating high-Z heteroatoms like selenium is an effective strategy to boost the performance of organic semiconductor X-ray detectors.
These novel detectors demonstrate superior sensitivity, flexibility, and stability, paving the way for advanced X-ray imaging solutions.