High charge-carrier mobilities in blends of poly(triarylamine) and TIPS-pentacene leading to better performing X-ray sensors

Solid State Organic X-Ray Detectors Based on Rubrene Single Crystals

“…mobility cm Vs) [2] [21]. On the contrary, a direct positive correlation between the X-ray irradiation sensitivity and the charge carrier mobility was found for organic X-ray detectors based on polymeric thin films [19]. Such a different behavior for polymeric thin films and the here reported OSSCs, in line with the mentioned evidences recorded for 4HCB, could be understood and justified by two considerations:…”

“…In order to overcome this limitation high-Z nanoparticles (metallic tantalum [18] and insulating bismuth oxide [15] [11]) have been added to the semiconducting polymer, enhancing the stopping power of the material. Another reported approach consisted in improving the transport properties of the organic film by introducing high-mobility small molecules in a blend with the polymer, leading to enhanced performance of the detector [19]. The approach we proposed is to employ OSSCs as the active detection material in direct solid-state X-ray detectors, as it allows to overcome easily the above mentioned problems from several points of view.…”

Heavy metallic oxide nanoparticles for enhanced sensitivity in semiconducting polymer x-ray detectors

“…Finally, we have previously found that the addition of small organic molecules into the semiconducting polymer layer increases the charge carrier mobility by a factor of 17, which results in an increase in the sensitivity of four times [18]. A promising strategy is therefore to combine high-Z nanoparticles and small organic molecules into a single device.…”

“…We have recently shown that direct X-ray induced photocurrents can be observed in metal/semiconducting polymer/metal diode structures [7,8,16,17] indicating the feasibility of using conjugated polymers in direct real-time radiation detection applications. The addition of small organic semiconducting molecules to Published in Nanotechnology 23 (2012) 235502 4 the polymer increased the charge-carrier mobility, which resulted in increased X-ray sensitivities [18].…”

Organic Semiconducting Crystals as Room Temperature Radiation Detectors

“…However, the few examples reported up to now in the literature of organic radiation detectors refer to semiconducting-or conducting-polymer thin films, or charge-transfer conducting organic crystals, which exhibit major stability problems [5][6][7][8][9][10].…”