Annealed bulk crystals of barium titanate (BaTiO3) exhibit persistent photoconductivity (PPC) at room temperature. Samples were annealed in a flowing gas humid argon and hydrogen, with higher flow rate corresponding to larger PPC. When exposed sub-bandgap light, broad infrared (IR) absorption peak appears 5000 cm−1 (2 μm), attributed polaronic or free-carrier from electrons the conduction band....

We report on the growth of amorphous carbon nitride films sa-CNxd showing the highest conductivity to date. The films were prepared using a layer-by-layer method sa-CNx :LLd, by the cyclical nitrogen radical sputtering of a graphite radical, alternated with a brief hydrogen etch. The photosensitivity S of these films is 105, defined as the ratio of the photoconductivity sp to the dark conductiv...

The photoconductive response of single-walled carbon nanotubes (SWNTs) has been studied under CW illumination in the NIR (900 – 1800 nm) and far-IR (9-10 μm) range. SWNTs were coated onto patterned gold electrodes with spacing which was varied from 5 to 300 nm. SWNT samples exhibit absorption NIR bands that are typical for semiconducting nanotubes with a diameter distribution of 0.8 – 1.1 nm an...

Electrical properties of unintentionally doped p-type Ga0.95In0.05N0.013As0.987 quaternary alloys grown by metal–organic vapor-phase epitaxy have been investigated by Hall-effect and photoconductivity measurements. Persistent photoconductivity ~PPC! has been observed in this material at temperatures T,320 K. The PPC buildup and decay kinetics have been systematically measured at different tempe...

Post growth annealing of solution grown ZnO nanowire array is performed under controlled oxygen ambience. The role of annealing over surface defects and their consequence on dark/photo-conductivity and photosensitivity of nanowire array is investigated. Surface defect properties are explored using various measurement tools such as contact angle, photoluminescence, Raman spectroscopy and XPS mea...

Molecules of a thiol-functionalized phenylacetylene derivative were assembled on the CdS nanorod surface and copolymerized with phenylacetylene, affording an inorganic semiconductor-conjugated polymer hybrid with excellent solubility and high photoconductivity.

Perylene bisimides (PBIs) self-assemble in solution. The solubility of the PBIs is commonly changed through the choice of substituents at the imide positions. It is generally assumed this substitution does not affect the electronic properties of the PBI, and that the properties of the self-assembled aggregate are essentially that of the isolated molecule. However, substituents do affect the sel...