Photovoltaic effect in PbS/PbTiO3/Si heterostructures

Abstract

PbS/PbTiO3/Si heterostructures were prepared by successive depositions of a PbTiO3 thin film using the sol-gel method and of a PbS thin film using the coprecipitation method on a bulk silicon wafer. The current–voltage characteristic of the heterostructure is of a diode type. The heterostructure is sensitive over a broad range of wavelengths, from 0.35 to 3 μm, when illuminated with continuous light or with modulated light. Three sensitivity peaks are observed, at 2.7, 0.95, and 0.38 μm. The measured signals are attributed to a photovoltaic effect which appears in the studied heterostructure.

Large‐Scale Synthesis of Necklace‐Like Single‐Crystalline PbTiO3 Nanowires

“…The surface photoelectric properties of the obtained samples might be used for optoelectric applications such as field effect controlled devices. [24] Conclusions In summary, we have described a simple electrospinning method to synthesize large-scale necklace-like singlecrystalline tetragonal perovskite PbTiO 3 nanowires. Because of the simplicity and generalizability of the approach used, it is anticipated that this methodology can be expanded to the large-scale synthesis of other important ferroelectric systems at the nanoscale, such as BaTiO 3 and BaZrO 3 .…”

Short-circuit photocurrent in epitaxial lead zirconate-titanate thin films

“…Two main differences are between the two signals: ͑i͒ pyroelectric signal is not due to generation of free carriers within the material, [6][7][8] and ͑ii͒ the pyroelectric signal occurs only in modulated light, while the photoelectric one occurs both under continuous and modulated illuminations. 9,10 Historically, the bulk photovoltaic effect was the photoelectriclike phenomena observed in ferroelectric single crystals and ceramics such as BaTiO 3 , LiTaO 3 , and LiNbO 3 . 11,12 It is worth noting that these materials also show a significant photorefractive effect.…”

Ferroelectric Behavior in Exfoliated 2D Aurivillius Oxide Flakes of Sub‐Unit Cell Thickness

“…To model the piezoresponse behavior in the presence of mobile charge injection and leakage, consider how the charge will move into and out of the FE during the field‐on and field‐off periods, taking account of the switching of the FE polarization through the loop cycle. To do this, we use the approach of Pintilie and Alexe,41 later modified by Fan et al,42 who considered the thermionic emission of current into an insulator across a metal‐insulator junction, including the effects of FE polarization and charge trapping. The descriptions are based on a modified version of the Schottky barrier model.…”