Degradation of CdTe SC during operation: modeling and experiment

Bolbas, Olexander; Deyneko, Natalya; Yeremenko, Sergey; Kyryllova, Olena; Myrgorod, Oksana; Soshinsky, Olexander; Teliurа, N.; Tsapko, Nataliia; Shevchenko, Roman; Yurchyk, Yuliia

doi:10.15587/1729-4061.2019.185628

Cited by 5 publications

(4 citation statements)

References 21 publications

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“…According to earlier studies [10,11], in the film ITO/ CdS/CdTe/Cu/Au SCs the main mechanism of degradation in their efficiency is associated with a copper diffusion into the CdS/CdTe heterojunction region from a Cu/Au electrode. This process causes a decrease in the quality of the separating barrier by increasing the density of the diode saturation current and reducing the shunting electric resistance.…”

Section: Discussion Of Results Of Studying the Effectiveness And Physmentioning

confidence: 99%

“…Another important criterion for increasing demand for the use of solar cells is degradation resistance. Papers [10,11] reported an analysis of the processes of degradation taking place in solar cells (hereinafter, SCs) based on cadmium telluride and proposed a way to restore their effectiveness. Work [12] examined the radiation resistance of CdTe solar cells with an efficiency of ~10 %, whose structure was formed on the anti-radiation glass.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

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Devising a technique to improve the efficiency of CdS/CdTe/Cu/Au solar cells intended for use as a backup power source for the systems of safety and control of objects

Deyneko

Zhuravel²,

Михайлова

et al. 2020

EEJET

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This paper reports a study into the impact of cadmium telluride layer thickness on the effectiveness of the CdS/CdTe/Cu/Au film solar cells. The physical mechanisms have been investigated of charge transfer in the CdS/CdTe/ Cu/Au solar cells, which are intended for use as a backup power source for the systems of safety and control of objects. This is important because, despite the growing popularity of solar cell application, the effectiveness of laboratory samples differs greatly from the theoretical maximum. Thus, it has been established that the optimum thickness of the base layer of film CdS/CdTe/Cu/Au SCs is 4 µm. When the thickness of the cadmium telluride layer is reduced, the effectiveness of such an assembly decreases. The decrease in efficiency occurs as a result of reducing the shunting electric resistance, increasing the density of a diode saturation current, as well as consistent electric resistance. With the increase in the thickness of the telluride layer exceeding 4 µm, there is also a decrease in the efficiency of a solar cell due to the reduced shunting resistance and the increased serial electric resistance. The deterioration of the specified light diode characteristics of CdS/CdTe/ Cu/Au SCs, which occurs when the thickness of the base layer is reduced by more than 4 µm, is due to the diffusion of copper from the contact to the area of the separating barrier. The deterioration of light diode characteristics when increasing the thickness of the base layer of cadmium telluride is associated with a decrease in the positive effects of "chloride" treatment. The examined physical charge transfer mechanisms in the CdS/CdTe/Cu/Au solar cells have made it possible to establish the height of the rear potential barrier. In the samples studied, the height of the rear potential barrier is 0.3 eV. The existence of such a barrier gives rise to the thermal-emission mechanism of charge transfer in such solar cells when applying a direct offset exceeding 1 V

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Section: Discussion Of Results Of Studying the Effectiveness And Physmentioning

confidence: 99%

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Devising a technique to improve the efficiency of CdS/CdTe/Cu/Au solar cells intended for use as a backup power source for the systems of safety and control of objects

Deyneko

Zhuravel²,

Михайлова

et al. 2020

EEJET

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“…The use of planning methods made it possible to significantly reduce the volume of tests, which is especially important when conducting technically complex and expensive research [8].…”

Section: Discussionmentioning

confidence: 99%

Planning an Experiment for Low-Cycle Fatigue under Conditions Deep Cooling

Medved

Kovregin

Myrgorod

et al. 2021

MSF

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In the elements of structures with a limited resource during operation, significant cyclic stresses can occur, reaching and exceeding the yield strength; the results of an experimental study of the effect of the magnitude of preliminary plastic deformations on the strength and durability of structural alloys under low-cycle loading can be of undoubted interest for practice. The use of experimental planning methods in the study of the influence of the maximum cycle stresses and the magnitude of the preliminary permanent deformation on the low-cycle fatigue of 03Kh13AG19 chromium-manganese steel at T = 4.2 K under pulsating tension showed that these methods can be successfully used.

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“…It has an optimal band gap of about 1.5 eV, which can provide an efficiency of about 30 % at an open circuit voltage of more than 1 V and a short-circuit current density of more than 30 mA/cm 2 [4]. Research by scientists who are engaged in film solar cells based on CdTe are focused on finding approaches aimed at increasing the efficiency of such device structures, as well as increasing their degradation resistance [5], this is especially typical for solar cells on a flexible substrate. Since solar cells on a flexible substrate change their configuration in the film during operation, excessive stresses arise.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Development of a method for producing effective CdS/CdTe/Cu/Au solar elements on a flexible substrate designed for backup supplying systems prevention of emergency situations

Borysenko

Burmenko

Deyneko

et al. 2021

EEJET

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The technology of forming film solar cells based on CdS / CdTe configuration of the "superstrat" type on a flexible substrate has been improved. To increase the efficiency of the developed solar cells on a flexible substrate, a chemical etching procedure in a nitrogen-phosphorus mixture was added to the traditional "chemical treatment". The conducted studies of the output parameters of the developed device structures showed that the highest values are observed in the case of chemical etching, both before the "chloride treatment" and after it. In the course of the study, it was found that a mandatory procedure in the formation of effective device structures is chemical etching in a nitrogen-phosphorus mixture both before the "chloride treatment" and after it. Carrying out the described procedures made it possible to obtain solar cells on a flexible substrate with an efficiency of 13.1 %. The increase in the efficiency of solar cells with two-stage chemical etching can be explained by the formation of excess tellurium on the surface, which leads to a decrease in resistance and, therefore, to a more efficient penetration of chlorine during the subsequent chloride treatment. Analysis of the transverse cleavage of the investigated device structures demonstrates significant grain growth and surface smoothness of the base layer, which ensures good adhesion with back contact. A study of the degradation resistance of the developed device structures during operation has been carried out. It was found that the obtained solar cells based on CdTe on a flexible substrate have a high degradation resistance and after 10 bending cycles there is no decrease in the output parameters. Thus, it has been established that chemical etching in a nitrogen-phosphorus mixture is a mandatory procedure for the formation of efficient solar cells on a flexible substrate.

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Degradation of CdTe SC during operation: modeling and experiment

Cited by 5 publications

References 21 publications

Devising a technique to improve the efficiency of CdS/CdTe/Cu/Au solar cells intended for use as a backup power source for the systems of safety and control of objects

Devising a technique to improve the efficiency of CdS/CdTe/Cu/Au solar cells intended for use as a backup power source for the systems of safety and control of objects

Planning an Experiment for Low-Cycle Fatigue under Conditions Deep Cooling

Development of a method for producing effective CdS/CdTe/Cu/Au solar elements on a flexible substrate designed for backup supplying systems prevention of emergency situations

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