Journal
NATURE PHOTONICS
Volume 9, Issue 7, Pages 444-+Publisher
NATURE PORTFOLIO
DOI: 10.1038/NPHOTON.2015.82
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Funding
- Austrian Science Fund FWF through the SFB project IR_ON
- 'Aufbruch Bayern' initiative of the state of Bavaria
- European Union through the FP7 (ERC Starting Grant NANOSOLID) [306733]
- Austrian Science Fund (FWF) [J 3523] Funding Source: researchfish
- Austrian Science Fund (FWF) [J3523] Funding Source: Austrian Science Fund (FWF)
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The evolution of real-time medical diagnostic tools such as angiography and computer tomography from radiography based on photographic plates was enabled by the development of integrated solid-state X-ray photon detectors made from conventional solid-state semiconductors. Recently, for optoelectronic devices operating in the visible and near-infrared spectral regions, solution-processed organic and inorganic semiconductors have also attracted a great deal of attention. Here, we demonstrate a possibility to use such inexpensive semiconductors for the sensitive detection of X-ray photons by direct photon-to-current conversion. In particular, methylammonium lead iodide perovskite (CH3NH3PbI3) offers a compelling combination of fast photoresponse and a high absorption cross-section for X-rays, owing to the heavy Pb and I atoms. Solution-processed photodiodes as well as photoconductors are presented, exhibiting high values of X-ray sensitivity (up to 25 mu C mGy(air)(-1) cm(-3)) and responsivity (1.9 x 10(4) carriers/photon), which are commensurate with those obtained by the current solid-state technology.
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