We developed a new concept of X- and γ-ray radiation semiconductor detectors based on a large area graphene/semi-insulating single crystal CdTe Schottky-type heterojunction. These two terminal electronic devices can be easily fabricated by forming a Van der Waals contact between large area chemical vapor deposited graphene and CdTe substrates in air and at room temperature. This approach significantly reduces the fabrication cost and improves the reproducibility and stability of electrical properties. A detailed analysis of their AC and DC electrical properties was carried out in order to determine the width of the space charge region and dominant charge transport mechanisms at reverse bias. The unoptimized graphene/CdTe heterojunction detectors exhibited a promising spectral resolution of 241Am (59 keV) and 137Cs (662 keV) isotope radiation at room temperature.
Photosensitive heterojunctions n-TiO 2 /p-CdTe were fabricated by dc reactive magnetron deposition of TiO 2 thin films with n-type conductivity onto freshly cleaved p-CdTe single-crystal substrates (1 1 0). Their electrical properties were investigated and the dominating current mechanisms were analyzed at forward and reverse biases in the scope of the tunnel-recombination and emission-recombination models. The obtained surface-barrier structures n-TiO 2 /p-CdTe possessed the following photoelectrical parameters under 100 mW cm −2 illumination: the open-circuit voltage V oc = 0.69 V, the short-circuit current I sc = 6 mA cm −2 and the fill factor FF = 0.42.
A detailed study of hitherto unknown electrical and thermoelectric properties of graphite pencil traces on paper was carried out by measuring the Hall and Seebeck effects. We show that the combination of pencil-drawn graphite and brush-painted poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) films on regular office paper results in extremely simple, low-cost, and environmentally friendly thermoelectric power generators with promising output characteristics at low-temperature gradients. The working characteristics can be improved even further by incorporating ntype InSe flakes. The combination of pencil-drawn n-InSe:graphite nanocomposites and brush-painted PEDOT:PSS increases the power output by 1 order of magnitude.
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