Power loss mechanisms in small area monolithic-interconnected photovoltaic modules

• Autorzy: Kimovec, R. , Helmers, H. , Bett, A. W. , Topič, M.
• Języki publikacji: EN

Abstrakty

EN

Power loss mechanisms in small area monolithic-interconnected photovoltaic modules (MIM) are described and evaluated. Optical and electrical losses are quantified and individual loss components are derived for loss mechanisms of small area radial (radius = 1 mm) pie-shaped six-segment GaAs MIM laser power converter. At low monochromatic homogeneous illumination (G_low= 1.8 W/cm², λ₀= 809 nm) conversion efficiency of the cell, designed for a low irradiance, is reduced by 3.7%_abs. due to isolation trench optical losses and by 7.0%_abs. due to electrical losses (mainly perimeter recombination). Electrical losses in a device designed for a high irradiance, result in 18%_abs. decrease of output power under homogeneous monochromatic illumination (G_high= 83.1 W/cm², λ₀= 809 nm), while 11.6%_abs. losses are attributed to optical reasons. Regardless the irradiance level, optical losses further increase if the device is illuminated with a Gaussian instead of an ideal flattop beam profile. In this case, beam spillage losses occur and losses due to isolation trenches and reflections from metallization are elevated. On top of that, additional current mismatch losses occur, if individual MIM’s segments are not equally illuminated. For the studied device, a 29 μm off center misalignment of a Gaussian shaped beam (with 1% spillage) reduces the short circuit current Iscby 10%abs.due to the current mismatch between segments.

Słowa kluczowe

EN

monolithic interconnected photovoltaic module; laser power converter; optical and electrical losses; current mismatch; Gaussian illumination

• Czasopismo: Opto-Electronics Review
• Rocznik: 2018
• Tom: Vol. 26, No. 2
• Strony: 158--164
• Opis fizyczny: Bibliogr. 22 poz., rys., wykr.

Twórcy

autor

Kimovec, R.

• University of Ljubljana, Faculty of Electrical Engineering, Tržaška cesta 25, 1000 Ljubljana, Slovenia,

autor

Helmers, H.

• Fraunhofer Institute for Solar Energy Systems ISE, Heidenhofstr. 2, 79110 Freiburg, Germany

autor

Bett, A. W.

• Fraunhofer Institute for Solar Energy Systems ISE, Heidenhofstr. 2, 79110 Freiburg, Germany

autor

Topič, M.

• University of Ljubljana, Faculty of Electrical Engineering, Tržaška cesta 25, 1000 Ljubljana, Slovenia

Bibliografia

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Uwagi

1. The authors acknowledge the financial support from the Slovenian Research Agency (program P2-0197 and PhD funding for R.K.).

2. Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).

Identyfikatory

DOI

10.1016/j.opelre.2018.04.002