Towards Quantitative Interpretation of Fourier-Transform Photocurrent Spectroscopy on Thin-Film Solar Cells
| Autor: | Jakub Holovský, Michael Stuckelberger, Martin Müller, Franz-Josef Haug, Tomáš Finsterle, Brianna Conrad, Amalraj Peter Amalathas |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Amorphous silicon
Materials science Band gap defect density 02 engineering and technology amorphous silicon 010402 general chemistry 01 natural sciences chemistry.chemical_compound Materials Chemistry Radiative transfer radiative limit Absorption (electromagnetic radiation) Spectroscopy photocurrent spectroscopy Photocurrent business.industry Open-circuit voltage Photovoltaic system Surfaces and Interfaces 021001 nanoscience & nanotechnology 0104 chemical sciences Surfaces Coatings and Films chemistry open-circuit voltage lcsh:TA1-2040 solar cells ddc:660 Optoelectronics 0210 nano-technology business lcsh:Engineering (General). Civil engineering (General) |
| Zdroj: | Coatings, Vol 10, Iss 820, p 820 (2020) Coatings Volume 10 Issue 9 Coatings 10(9), 820 (2020). doi:10.3390/coatings10090820 special issue: "Advances in Thin Films for Photovoltaic Applications" |
| ISSN: | 2079-6412 |
| Popis: | Coatings 10(9), 820 (2020). doi:10.3390/coatings10090820 special issue: "Advances in Thin Films for Photovoltaic Applications" The method of detecting deep defects in photovoltaic materials by Fourier-Transform Photocurrent Spectroscopy has gone through continuous development during the last two decades. Still, giving quantitative predictions of photovoltaic device performance is a challenging task. As new materials appear, a prediction of potentially achievable open-circuit voltage with respect to bandgap is highly desirable. From thermodynamics, a prediction can be made based on the radiative limit, neglecting non-radiative recombination and carrier transport effects. Beyond this, more accurate analysis has to be done. First, the absolute defect density has to be calculated, taking into account optical effects, such as absorption enhancement, due to scattering. Secondly, the electrical effect of thickness variation has to be addressed. We analyzed a series of state-of-the-art hydrogenated amorphous silicon solar cells of different thicknesses at different states of light soaking degradation. Based on a combination of empirical results with optical, electrical and thermodynamic simulations, we provide a predictive model of the open-circuit voltage of a device with a given defect density and absorber thickness. We observed that, rather than the defect density or thickness alone, it is their product or the total number of defects, that matters. Alternatively, including defect absorption into the thermodynamic radiative limit gives close upper bounds to the open-circuit voltage with the advantage of a much easier evaluation. Published by MDPI, Basel |
| Databáze: | OpenAIRE |
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