<p>Understanding degradation processes and the lifetime of photovoltaic organic modules is essential for developing and applying this technology on a large scale. This study investigated degradation mechanisms and the lifetime of flexible inverted organic solar cells in two Brazilian locations. Outdoor tests were conducted for over 5,600 hours in Fortaleza (<InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="42341_2025_598_Article_IEq1.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="35" /> </InlineMediaObject> <EquationSource Format="TEX">\(3.7~^\circ\)</EquationSource> </InlineEquation> S, <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="42341_2025_598_Article_IEq2.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="43" /> </InlineMediaObject> <EquationSource Format="TEX">\(38.5~^\circ\)</EquationSource> </InlineEquation> W) and Belo Horizonte (<InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="42341_2025_598_Article_IEq3.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="43" /> </InlineMediaObject> <EquationSource Format="TEX">\(19.9~^\circ\)</EquationSource> </InlineEquation> S, <InlineEquation ID="IEq4"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="42341_2025_598_Article_IEq4.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="43" /> </InlineMediaObject> <EquationSource Format="TEX">\(43.9~^\circ\)</EquationSource> </InlineEquation> W), Brazil, using ISOS-O-1 and ISOS-O-2 protocols. We applied impedance spectroscopy to help understand the degradation mechanisms of organic photovoltaic modules. Our findings indicate that local weather conditions strongly influenced the degradation processes and lifetime of the modules. The power conversion efficiency values of modules tested in Fortaleza decreased virtually to zero after 240 days. In contrast, the modules tested in Belo Horizonte exhibited better stability, with power conversion efficiency values above 10%, even after completing the tests (270 days).</p>

Characterization of Organic Photovoltaic Modules as a Function of Latitude: A Comparative Study Between Brazilian Northeast and Southeast Regions

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发表日期：

2025年4月24日

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L. P. M. Santos,
F. A. S. Lima,
C. N. Freitas,
F. G. S. Oliveira,
M. S. Pereira,
G. A. Soares,
D. Bagnis,
I. F. Vasconcelos

摘要

Understanding degradation processes and the lifetime of photovoltaic organic modules is essential for developing and applying this technology on a large scale. This study investigated degradation mechanisms and the lifetime of flexible inverted organic solar cells in two Brazilian locations. Outdoor tests were conducted for over 5,600 hours in Fortaleza ( \(3.7~^\circ\) S, \(38.5~^\circ\) W) and Belo Horizonte ( \(19.9~^\circ\) S, \(43.9~^\circ\) W), Brazil, using ISOS-O-1 and ISOS-O-2 protocols. We applied impedance spectroscopy to help understand the degradation mechanisms of organic photovoltaic modules. Our findings indicate that local weather conditions strongly influenced the degradation processes and lifetime of the modules. The power conversion efficiency values of modules tested in Fortaleza decreased virtually to zero after 240 days. In contrast, the modules tested in Belo Horizonte exhibited better stability, with power conversion efficiency values above 10%, even after completing the tests (270 days).