Highly improved responsivity of self-powered UV–Visible photodetector based on TiO2/Ag/TiO2 multilayer deposited by GLAD technique: Effects of oriented columns and nano-sculptured surface

Ultrathin Sb2Se3 Nanowires for Polarimetric Imaging Photodetectors with a High Signal/Noise Ratio

“…The virtually linear and symmetric I‐V curves indicate that the ohmic‐like contacts are formed between the metal electrodes and Sb 2 Se 3 NW. The device shows a much lower dark current of 1.1 pA at 2 V bias compared with that of many other optical devices reported, [ 17,22 ] resulting in the observed high signal/noise ratios. This might be ascribed to the high crystal quality of the Sb 2 Se 3 NW.…”

“…Previous reports study that the effective mass of a free carrier plays a significant role in determining the electrical conductivity of a material. [ 6,17 ] As shown in Table 1, the differences in effective masses for electrons and holes along different directions indicate the highly intrinsic electrical anisotropy of the Sb 2 Se 3 crystal. $$\[ \begin{array}{*{20}{c}}{{m_e}\left( {{\rm{or }}{m_h}} \right) = {\hbar ^2}{{\left( {\frac{{{d^2}E}}{{d{k^2}}}} \right)}^{ - 1}}}\end{array} \]$$ $$\[ \begin{array}{*{20}{c}}{{a_{{\rm{exc}}}} = \frac{{{\varepsilon _r}{\varepsilon _0}h}}{{{m^ * }{q^2}}} = \left( {\frac{{{\varepsilon _0}h}}{{{m_0}{q^2}}}} \right)\frac{{{\varepsilon _r}{m_0}}}{{{m^ * }}} = {a_0}{\varepsilon _r}{m_0}\left( {\frac{1}{{{m_e}}} + \frac{1}{{{m_h}}}} \right)}\end{array} \]$$To understand the quantum confinement in Sb 2 Se 3 NWs, the exciton Bohr radiuses ( a exc ) along the a , b , c directions are also calculated for Sb 2 Se 3 .…”

“…Previous reports study that the effective mass of a free carrier plays a significant role in determining the electrical conductivity of a material. [6,17] As shown in Table 1, the differences in effective masses for electrons and holes along different directions indicate the highly intrinsic electrical anisotropy of the Sb 2 Se 3 crystal.…”

Aligned CuO nanowire array for a high performance visible light photodetector

“…As the field of application expands further, photodetectors with more functionality, such as transparency, flexibility, and broad absorption spectrum are required. Therefore, a wider range of materials including organic materials 5 , 6 , organic–inorganic hybrids 7 , quantum dots 8 , 9 , 2D nanomaterials 10 , 11 , and metal oxides 12 – 14 , have drawn attention in recent years as next-generation photodetector materials. Among various candidates, copper oxide (CuO), which has a high optical absorption coefficient and the lowest band gap energy among metal oxides, is a promising material for visible light photodetectors with transparency and flexibility 15 – 18 .…”

Developing GLAD Parameters to Control the Deposition of Nanostructured Thin Film

“…Additionally, Mendoza-Rincon et al [28] recently presented how the substrate rotation affects the roughness in Zr thin films grown using the GLAD technique. However, in the vast majority of papers, homemade or custom-made GLAD systems are presented [29][30][31][32][33][34][35][36][37]. In these cases, the possibility of being widely used in industrial processes is lowered.…”