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1.
A novel aluminum iron oxide(Al/AlFe2O4/p-Si) Schottky photodiode was successfully fabricated via the sol–gel coating process. The microstructure of the spinel ferrite(AlFe2O4) was examined by atomic force microscopy. The current–voltage characteristics of the fabricated photodiode were studied under dark and different illumination conditions at room temperature. By using the thermionic emission theory, the forward bias I–V characteristics of the photodiode are analyzed to determine the main electrical parameters such as the ideality factor(n) and barrier height(ΦB0) of the photodiode. The values of n and ΦB0 for all conditions are found to be about 7.00 and 0.76 eV, respectively. In addition,the values of series resistance(Rs) are determined using Cheung's method and Ohm's law. The values of Rs and shunt resistance(Rsh) are decreased with the increase of illumination intensity. These new spinel ferrites will open a new avenue to other spinel structure materials for optoelectronic devices in the near future. 相似文献
2.
M. -H. Yu. Seyidov A. P. Odrinskii R. A. Suleymanov E. Acar T. G. Mammadov V. B. Alieva 《Physics of the Solid State》2014,56(10):2028-2034
The results of investigations of the pyroelectric current in a layered TlInS2 crystal doped with lanthanum are presented. A comparative analysis of the obtained results and data of photo-induced current transient spectroscopy has been performed. The revealed features of the contribution from electrically active defects to pyroelectric properties of the crystal have been discussed. 相似文献
3.
A. P. Odrinskii M. H. Yu. Seyidov R. A. Suleymanov T. G. Mammadov V. B. Aliyeva 《Physics of the Solid State》2016,58(4):716-722
This paper reports on the results of the investigation of electrically active defects in the crystal structure in a layered ferroelectric–semiconductor TlInS2: La crystal by photoinduced current transient spectroscopy (PICTS). It has been found that there are states of the crystal that differ in the magnitude of the photoresponse varying within four orders of magnitude, which is interpreted in terms of the differences in states of the domain structure of the crystal. The specific features of the recording of thermal emission from defects in the presence of an additional contribution from the photovoltaic component of the response of the crystal to excitation with light have been discussed. 相似文献
4.
M. -H. Yu. Seyidov R. A. Suleymanov S. S. Babaev T. G. Mamedov G. M. Sharifov 《Physics of the Solid State》2008,50(1):108-117
The effect of external fields (dc electric field, light illumination) on the memory effect of the incommensurate phase in the ferroelectric-semiconductor TlGaSe2 is studied using the measured dielectric constant. The results obtained are discussed. It is shown for the first time that the effect of external fields on the anomaly related to the memory effect in TlGaSe2 can be reduced to the following universal empirical rule: when a sample is held for many hours at a constant temperature T 0 in the temperature range of the incommensurate phase in a dc electric field, the deflection amplitude in the low-temperature part of the anomaly in the temperature dependence of the relative change in the dielectric constant Δ?/? increases (the deflection in the high-temperature part of the Δ?/? anomaly disappears) as compared to this segment in the dependence obtained during isothermal annealing of this sample at the same temperature without an electric field. The crystal remembers its thermal history at a temperature that is several kelvins higher than T 0. Light illumination increases the deflection amplitude in the high-temperature part of the Δ?/?(T) anomaly and shifts the temperature at which the crystal remembers its thermal history toward lower temperatures with respect to T 0. 相似文献
5.
The temperature dependences of the permittivity of TlInS2(1 −x)Se2x
solid solutions have been experimentally investigated in the temperature range including the points of structural phase transitions
in the solid solutions. It has been established that the isovalent substitution of selenium for sulfur in the anion sublattice
of the TlInS2(1 − x)Se2x
solid solutions shifts the phase transition temperatures T
i
and T
c
toward the low-temperature range with a simultaneous decrease in the temperature interval of the existence of the incommensurate
phase. The T-x phase diagram is constructed for the solid solutions under study and the coordinates are determined for a critical point
(of the Lifshitz type) at which the lines T
i
(x) and T
c
(x) converge in the phase diagram. The pattern of the T-x phase diagram for the TlInS2(1 − x)Se2x
solid solutions has been analyzed within the phenomenological model of a virtual crystal. 相似文献
6.
A. P. Odrinskii T. G. Mammadov M. -H. Yu. Seyidov V. B. Alieva 《Physics of the Solid State》2014,56(8):1605-1609
Photoinduced current transient spectroscopy has been used in studying deep-level defects of the ferroelectric-semiconductor TlInS2. The specific features of defect detection in the lanthanum-doped and undoped single crystals have been compared. The explanation of the decrease in the photoelectric activity of defects in the doped sample has been proposed. 相似文献
7.
M. -H. Yu. Seyidov R. A. Suleymanov F. Salehli S. S. Babayev T. G. Mammadov A. I. Nadjafov G. M. Sharifov 《Physics of the Solid State》2009,51(3):568-576
The experimental data on memory effects in an incommensurate phase are analyzed both in undoped layered TlInS2 crystals selected from different technological batches and in TlInS2: La. Various types of unusual memory effect are detected. It is shown that the observed memory effects are due to pinning
of the soliton superstructure by a defect density wave in the internal field of the electret state.
Original Russian Text ? M.-H. Yu. Seyidov, R.A. Suleymanov, F. Salehli, S.S. Babayev, T.G. Mammadov, A.I. Nadjafov, G.M. Sharifov,
2009, published in Fizika Tverdogo Tela, 2009, Vol. 51, No. 3, pp. 533–542. 相似文献
8.
R.Z. Mehdiyeva Mir Hasan Yu. Seyidov I.B. Baykulov 《Journal of Physics and Chemistry of Solids》2006,67(12):2623-2627
Boundaries of morphotropic phase transitions region in the system of solid solutions K2Pb4Nb10O30-Na2Pb4Nb10O30-K6W4Nb6O30 with the structure of the tetragonal tungsten bronze have been specified. Presence of the second morphotropic phase transition, perpendicular to the first one has been revealed. The temperature dependences of the structural parameters of some compounds have been investigated. The compounds with high values of Curie temperatures and working temperatures have been obtained. 相似文献
9.
MANSOORI Yagoub TATAROGLU SEYIDOV Firdovsi BOHLOOLI Shahrbanoo ZAMANLOO Mohammad Reza IMANZADEH Gholam Hassan 《中国化学》2007,25(12):1878-1882
Esterification or transesterification reactions are usually carried out in the presence of homogeneous or heterogeneous catalysts. However, recently a new method was reported for the esterification of carboxylic acids by tributyl borate under solvent- and catalyst-free conditions. In order to show the synthetic ability of trialkyl borate esters in the esterification reactions, here, the esterification of other carboxylic acids and diacids by tributyl-, triisoamyl-, and tribenzyl borate under the same conditions were reported. Some of the prepared ester and diester products have found wide applications as plasticizers and synthetic ester base lubricants. The esterification reactions have been cleanly carried out in the absence of any solvent under catalyst-free conditions. The maximum rate belongs to isoamyl trichloroacetate (VIb) which reached about 76% within about 6.5 h. On the basis of obtained findings, it seems that electron withdrawing groups on carboxylic acid facilitate the esterification reaction. 相似文献
10.
M. -H. Yu. Seyidov R. A. Suleymanov S. S. Babaev T. G. Mammadov A. I. Nadjafov G. M. Sharifov 《Physics of the Solid State》2009,51(2):264-269
The influence of light on the low-frequency dielectric properties of the TlInS2 layered crystal is investigated for the first time. It is established that the illumination of the crystal during measurements
leads to a substantial change in the behavior of the temperature dependence of the permittivity ɛ of the TlInS2 compound doped with the lanthanum impurity in the range of the existence of the incommensurate phase. The temperature dependences
of the permittivity ε of the TlInS2 compound doped with the lanthanum impurity after preliminary cooling of the crystal in constant electric fields with different
strengths are studied for the first time. The inference is made that the experimentally observed photodielectric effect is
associated with the localization of charge carriers at defect levels in the band gap of the crystal with the formation of
local polarized states. 相似文献