Vygranenko, YuriSazonov, A.Heiler, G.Tredwell, T.Vieira, ManuelaNathan, Arokia2012-03-122012-03-122009-12-31VYGRANENKO, Y.; [et al] – Blue-enhanced thin-film photodiode for dual-screen x-ray imaging. Applied Physics Letters. ISSN 0003-6951. Vol. 95, N.º 26 (2009), pp. 1-3.0003-6951http://hdl.handle.net/10400.21/1268This article reports on a-Si:H-based low-leakage blue-enhanced photodiodes for dual-screen x-ray imaging detectors. Doped nanocrystalline silicon was incorporated in both the n- and p-type regions to reduce absorption losses for light incoming from the top and bottom screens. The photodiode exhibits a dark current density of 900 pA/cm(2) and an external quantum efficiency up to 90% at a reverse bias of 5 V. In the case of illumination through the tailored p-layer, the quantum efficiency of 60% at a 400 nm wavelength is almost double that for the conventional a-Si:H n-i-p photodiode.engCurrent densityp-i-n photodiodesThin filmsX-ray imagingjournal article10.1063/1.3276288