Observation of persistent photoconductivity in flower shaped PbS dendrite structures

Pendyala, Naresh Babu; Rao, K. S. R. Koteswara

doi:10.1016/j.ssc.2009.07.041

Cited by 4 publications

(5 citation statements)

References 24 publications

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“…PPC in flower-shaped PbS dendrites grown by the hydrothermal method is related to potential fluctuations (confinement regimes in the branches of dendrites) and surface traps. Photocurrent quenching and decreased dark current in the PPC occurred below 40 K, due to the presence of a metastable state, whereas positive PPC was observed in the temperature region 40-220 K [125].…”

Section: Other Interesting Structures That Present Some Sort Of Condu...mentioning

confidence: 90%

Transient decay of photoinduced current in semiconductors and heterostructures

Scalvi

Bueno

2019

J. Phys. D: Appl. Phys.

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Defects that exhibit some sort of lattice relaxation usually present an energy barrier for electron capture, and the possibility of developing the phenomenon known as persistent photoconductivity (PPC). In this effect, carriers induced in a metastable way remain in a conductive state forever, if the temperature is low enough to avoid the thermally excited retrapping of carriers by large lattice relaxation defects. Although this hypothesis is usually accepted to explain the origin of PPC, there are other principles such as the separation of excited carriers by random local-potential fluctuations. In this paper, we list many sorts of materials that exhibit the PPC effect and the attempts of several researchers to model the transient decay of PPC, seeking parameters in order to understand and model the electrical behavior of these materials. Besides, the PPC effect can be seen as the resulting electrical conduction obtained after removing the electromagnetic irradiation, and it is appealing for applications in a wide range of optoelectronic devices. A personal approach to modeling PPC decay is presented and applied to single crystalline semiconductors, nanocrystalline materials and heterostructures.

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Section: Other Interesting Structures That Present Some Sort Of Condu...mentioning

confidence: 90%

Transient decay of photoinduced current in semiconductors and heterostructures

Scalvi

Bueno

2019

J. Phys. D: Appl. Phys.

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“…It is most often described using a model in which carriers are photoexcited into localized states and then trapped in these states by large lattice relaxation, although other ways of trapping charge in localized states are invoked in different models . Ordinarily, the growth of PPC is much faster than the decay, though in at least one case, the time scales are about the same. This is in strong contrast to our results, for which the growth occurs over a time period roughly 6−100 times as long as the time for decay.…”

Section: Discussionmentioning

confidence: 99%

Effects of O₂, Xe, and Gating on the Photoconductivity and Persistent Photoconductivity of Porphyrin Nanorods

et al. 2010

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The photoconductivity of samples including both individual nanorods and bundles self-assembled from meso-tetra(4-sulfonato-phenyl)porphine grows over several days of illumination by more than a factor of 15. It also shows a transition from an initially nonpersistent response (in which the conductivity goes to zero when illumination is removed) to a primarily persistent response (in which the conductivity decays slowly when illumination is removed). Application of a gate voltage results in an initial n-type response, most of which decays away slowly, even though the gate voltage is held constant. The addition of O2 to the inert atmosphere surrounding the samples drastically reduces the persistent photoconductivity. When Xe is used instead of O2, there is at most a slight reduction of conductivity. A qualitative model is presented, in which the conductivity changes are attributed to light-induced and gate-voltage-induced adsorption and desorption of O2.

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“…Slow processes also cause a well‐known persistent photoconductivity phenomenon. It was observed in a number of materials including carbon nanotube structures . Persistent photoconductivity of modified carbon nanotube film lasting for more than 30 min was reported by Khairoutdinov et al .…”

Section: Introductionmentioning

confidence: 70%

“…[15] Slow processes also cause a well-known persistent photoconductivity phenomenon. It was observed in a number of materials [16,17] including carbon nanotube structures. [18][19][20] Persistent photoconductivity of modified carbon nanotube film lasting for more than 30 min was reported by Khairoutdinov et al [19] The slow processes were attributed to the photoinduced electron transfer from attached molecular substituents to carbon nanotubes.…”

Section: Introductionmentioning

confidence: 97%

Electronic and Ionic Electric Field Screening and Persistent Built‐In Electric Field in Carbon Nanotube/PCBM Films

Jašinskas

Oberndorfer

Hertel

et al. 2020

Physica Status Solidi (a)

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The application of carbon nanotubes in electronic devices requires detailed knowledge of their electrical properties. Herein, the long‐lasting electric field‐induced polarization of single‐wall carbon nanotube (SWCNT) networks is demonstrated. It is found that electric voltage applied to the films of SWCNTs and their blends with [6,6]‐phenyl‐C61‐butyric acid methyl ester (PCBM) creates persistent polarization that partly screens the external electric field and creates a built‐in electric field of the opposite direction remaining for several days. The built‐in electric field has caused the appearance of an open‐circuit photovoltage and a short‐circuit photocurrent under the sample illumination at zero applied voltage. The built‐in field showed a clearly bicomponential decay. The short tens of microseconds component is attributed to the electronic polarization, while the long‐lived component, which decreases at low temperatures, is attributed to the temperature‐assisted motion of ions.

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Observation of persistent photoconductivity in flower shaped PbS dendrite structures

Cited by 4 publications

References 24 publications

Transient decay of photoinduced current in semiconductors and heterostructures

Transient decay of photoinduced current in semiconductors and heterostructures

Effects of O₂, Xe, and Gating on the Photoconductivity and Persistent Photoconductivity of Porphyrin Nanorods

Electronic and Ionic Electric Field Screening and Persistent Built‐In Electric Field in Carbon Nanotube/PCBM Films

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Observation of persistent photoconductivity in flower shaped PbS dendrite structures

Cited by 4 publications

References 24 publications

Transient decay of photoinduced current in semiconductors and heterostructures

Transient decay of photoinduced current in semiconductors and heterostructures

Effects of O2, Xe, and Gating on the Photoconductivity and Persistent Photoconductivity of Porphyrin Nanorods

Electronic and Ionic Electric Field Screening and Persistent Built‐In Electric Field in Carbon Nanotube/PCBM Films

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Effects of O₂, Xe, and Gating on the Photoconductivity and Persistent Photoconductivity of Porphyrin Nanorods