| Title |
Bilayer lead oxide X-ray photoconductor for lag-free operation / |
| Authors |
Grynko, Oleksandr ; Thibault, Tristen ; Pineau, Emma ; Juška, Gytis ; Reznik, Alla |
| DOI |
10.1038/s41598-020-77050-w |
| Full Text |
|
| Is Part of |
Scientific reports.. Berlin : Nature research. 2020, vol. 10, iss. 1, art. no. 20117, p. 1-9.. ISSN 2045-2322 |
| Keywords [eng] |
Electronic properties and materials ; Semiconductors ; X-rays |
| Abstract [eng] |
Polycrystalline Lead Oxide (poly-PbO) was considered one of the most promising photoconductors for the direct conversion X-ray medical imaging detectors due to its previous success in optical imaging, i.e., as an optical target in so-called Plumbicon video pick-up tubes. However, a signal lag which accompanies X-ray excitation, makes poly-PbO inapplicable as an X-ray-to-charge transducer in real-time X-ray imaging. In contrast, the recently synthesized Amorphous Lead Oxide (a-PbO) photoconductor is essentially lag-free. Here, we report on our approach to a PbO detector where a thin layer of a-PbO is combined with a thick layer of poly-PbO for lag-free operation. In the presented a-PbO/poly-PbO bilayer structure, the poly-PbO layer serves as an X-ray-to-charge transducer while the a-PbO acts as a lag prevention layer. The hole mobility in the a-PbO/poly-PbO bilayer structure was measured by photo-Charge Extraction by Linearly Increasing Voltage technique at different temperatures and electric fields to investigate charge transport properties. It was found that the hole mobility is similar to that in a-Se—currently the only commercially viable photoconductor for the direct conversion X-ray detectors. Evaluation of the X-ray temporal performance demonstrated complete suppression of signal lag, allowing operation of the a-PbO/poly-PbO detector in real-time imaging. |
| Published |
Berlin : Nature research |
| Type |
Journal article |
| Language |
English |
| Publication date |
2020 |
| CC license |
|
