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Broadening of Light Coupling to Waveguide Modes in Solar Cells by Disordered Grating Texturess

Bittkau, Karsten; Hoffmann, André; Paetzold, Ulrich W.; Carius, Reinhard

Abstract:
We investigated the light coupling to waveguide modes in nanophotonic thin-film solar cells exhibiting a tailored disordered grating texture by rigorous optical simulations. Such disordered nanophotonic light trapping concepts have demonstrated enhanced short-circuit current density compared to ordered nanophotonic thin-film solar cells. This observation is commonly explained by a spectral broadening of the resonant light coupling to waveguide modes. In this work, we investigated the origin of this spectral broadening. We identified two basic mechanisms that lead to a spectral broadening of the light coupling to waveguide modes: (1) the broadening of the wave vector transferred by the disordered interface texture and (2) the broadening of the waveguide mode due to the distortion of the wave guiding absorber layer. Depending on the type of disorder, the contribution from each of the mechanisms varies.


Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Lichttechnisches Institut (LTI)
Publikationstyp Zeitschriftenaufsatz
Jahr 2017
Sprache Englisch
Identifikator DOI: 10.3390/app7070725
ISSN: 2076-3417
URN: urn:nbn:de:swb:90-730299
KITopen ID: 1000073029
Erschienen in Applied Sciences
Band 7
Heft 7
Seiten Art. Nr. 725
Lizenz CC BY 4.0: Creative Commons Namensnennung 4.0 International
Schlagworte light trapping, thin-film solar cells, waveguide modes, optical simulation, FDTD, disordered gratings
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