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Implied Open‐circuit Voltage Imaging via a Single Bandpass Filter Method—Its First Application in Perovskite Solar Cells

Soufiani, Arman Mahboubi ; Lee-Chin, Robert; Fassl, Paul ORCID iD icon 1,2; Mahmud, Md Arafat; Pollard, Michael E.; Zheng, Jianghui; Weber, Juergen W.; Ho-Baillie, Anita; Trupke, Thorsten; Hameiri, Ziv
1 Lichttechnisches Institut (LTI), Karlsruher Institut für Technologie (KIT)
2 Institut für Mikrostrukturtechnik (IMT), Karlsruher Institut für Technologie (KIT)

Abstract:

A direct, camera-based implied open-circuit voltage (iVOC) imaging method via the novel use of a single bandpass filter (s-BPF) is developed for large-area photovoltaic solar cells and solar cell precursors. This method images the photoluminescence (PL) emission using a narrow BPF with centre energy in the high-energy tail of the PL emission taking advantage of the close-to-unity absorptivity of typical photovoltaic devices with low variability in this energy range. As a result, the exact value of the sample's absorptivity within the BPF transmission band is not required. The use of a s-BPF enables the adaptation of a fully contactless approach to calibrate the absolute PL photon flux for camera-based spectrally-integrated imaging tools. The method eliminates the need for knowledge of the imaging system spectral response and the use of the emission and excitation spectral shapes. Through an appropriate choice of the BPF centre energy, a range of absorber compositions or a single absorber with different surface morphologies (e.g., planar vs textured) can be imaged, all without the need for additional detection optics. The feasibility of this s-BPF method is first assessed using a high-quality Cs$_{0.05}$FA$_{0.79}$MA$_{0.16}$Pb(I$_{0.83}$Br$_{0.17}$)$_3$ perovskite neat film. ... mehr


Volltext §
DOI: 10.5445/IR/1000153483
Veröffentlicht am 05.12.2022
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Lichttechnisches Institut (LTI)
Publikationstyp Forschungsbericht/Preprint
Publikationsjahr 2022
Sprache Englisch
Identifikator KITopen-ID: 1000153483
HGF-Programm 38.01.03 (POF IV, LK 01) Cell Design and Development
Umfang 24 S.
Vorab online veröffentlicht am 26.08.2022
Schlagwörter single bandpass filter, high-energy absorptivity, contactless calibration, luminescence imaging, implied open-circuit voltage, solar cells
Nachgewiesen in Dimensions
arXiv
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