The influence of the photovoltaic effect on the surface electric field in GaN

Zdanowicz, Ewelina; Herman, Artur P.; Kudrawiec, R.

doi:10.1016/j.apsusc.2021.151905

Cited by 6 publications

(5 citation statements)

References 34 publications

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“…The investigated temperature range was from low to room temperature. The revealed increase of the built-in electric field was ascribed to the temperature dependence of piezoelectric polarization; − however, this explanation cannot be applied to our study, since sufficient thickness of van Hoof structures screens polarization effects …”

Section: Resultsmentioning

confidence: 78%

“…Simultaneously, in order to provide the band bending modulation, the external AC voltage (about 3 kV, 280 Hz) was applied on the sample mounted in the capacitor-like holder constructed of copper block (bottom electrode) and copper mesh (upper electrode). The sample was glued with silver paste to the bottom electrode about 0.5 mm beneath the upper one . The holder was equipped with the heater and Pt100 temperature sensor coupled with the Lakeshore temperature controller allowing measurements in the 298–440 K temperature range in ambient air.…”

Section: Methodsmentioning

confidence: 99%

“…The sample was glued with silver paste to the bottom electrode about 0.5 mm beneath the upper one. 36 The holder was equipped with the heater and Pt100 temperature sensor coupled with the Lakeshore temperature controller allowing measurements in the 298−440 K temperature range in ambient air.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

“…The revealed increase of the built-in electric field was ascribed to the temperature dependence of piezoelectric polarization; 60−62 however, this explanation cannot be applied to our study, since sufficient thickness of van Hoof structures screens polarization effects. 36 In order to provide an insightful analysis of observed surface barrier temperature dependence, the following aspects have to be taken into consideration.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

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Origin of Surface Barrier Temperature Dependence for the Polar GaN Surface

Zdanowicz

Herman

Sobanska

et al. 2022

ACS Appl. Electron. Mater.

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Combining the mature technology of gallium nitride (GaN) with emerging materials such as van der Waals crystals is presently an important path in applied science research. Up to now, a broad spectrum of optoelectronic devices including light emitters, photodetectors, and solar cells based on mentioned materials has been presented. Understanding and controlling the surface-related phenomena is a crucial aspect for proper electrical device operation. In particular, an insight into the impact of external conditions such as elevated temperature on technologically important parameters such as surface barrier is of great importance. In this study we propose the first spectroscopic investigation of the vulnerability of the surface barrier on temperature for the Ga-polar GaN surface. Studies performed in the 300–440 K temperature range using contactless electroreflectance (CER) enabled nondestructive probing of GaN surface states. The range of investigated materials was extended to graphene/GaN and h-BN/GaN hybrids together with GaAs as a reference in order to provide a comprehensive case study. We show that GaN surface densities of states revealed robust temperature dependence compared to the energy gap. The mechanism of temperature-induced carrier redistribution at the surface is proposed as an explanation.

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Section: Resultsmentioning

confidence: 78%

Section: Methodsmentioning

confidence: 99%

Section: ■ Materials and Methodsmentioning

confidence: 99%

Section: ■ Materials and Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Origin of Surface Barrier Temperature Dependence for the Polar GaN Surface

Zdanowicz

Herman

Sobanska

et al. 2022

ACS Appl. Electron. Mater.

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“…These photosensitive materials have the property of releasing their electrons under the influence of external energy. This is the photovoltaic effect (Zdanowicz et al, 2022;Zeng et al, 2022). A photovoltaic solar generator is composed of photovoltaic modules; they are composed of photovoltaic cells connected between them.…”

Section: Photovoltaic Solar Energymentioning

confidence: 99%

Optimization of a Management Algorithm for an Innovative System of Automatic Switching between Two Photovoltaic and Wind Turbine Modes for an Ecological Production of Green Energy

Lahlou

Hajji

Aggour

2022

Int. J. Renew. Energy Dev.

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Today, renewable energy and energy efficiency are key to limiting global warming and preventing the dangerous effects of climate change. The biggest problem with conventional solar and wind turbine systems is the intermittency of electrical power generation. Even if these two energy sources can be complementary, the space occupied by these hybrid systems remains very important. This work proposes an improved management algorithm for a patented transformable photovoltaic-wind system, which mainly uses two flexible photovoltaic panels which are automatically deformed by an electromechanical system from the planar shape to the semi-cylindrical shape of the Savonius wind turbine blades. When weather conditions change, this system switches to eco-friendly photovoltaic (PV) or wind turbine (WT) mode, allowing a good total power generation from two solar power sources or wind turbine power. The contribution brought for this work relates to the realization and the improvement of the management algorithm to determine a better change to the mode PV or the mode WT. The operation test was simulated in 8760 hours for the year 2021. This developed algorithm allows several theoretical calculations of the power produced from solar radiation and wind speed data, thereafter the algorithm compare and determines the overall power and selects the optimal PV or WT mode. In this study, the overall power generated by the invented system produces more electricity per hour, the power Pt increases by 75.55% compared to the power Pwt, and also the power Pt increases by 68.15% compared to Pvp power.

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