Structure-induced resonant tail-state regime absorption in polymer : fullerene bulk-heterojunction solar cells

In this work, we present resonant tail-state regime absorption enhanced organic photovoltaics. We combine periodically structured TiO2 bottom electrodes with P3HT-PCBM bulk-heterojunction solar cells in an inverted device configuration. The wavelength-scale patterns are transferred to the electron-selective bottom electrodes via direct laser interference patterning, a fast method compatible with roll-to-roll processing. Spectroscopic and optoelectronic device measurements suggest polarization-dependent absorption enhancement along with photocurrent generation unambiguously originating from the population of tail states. We discuss the effects underlying these absorption patterns with the help of electromagnetic simulations using the discontinuous Galerkin time domain method. For this, we focus on the total absorption spectra along with spatially resolved power loss densities. Our simulations stress the tunability of the absorption resonances towards arbitrary wavelength regions.

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PFADLER, Thomas, Thomas KIEL, Martin STÄRK, Julia F. M. WERRA, Christian MATYSSEK, Daniel SOMMER, Johannes BONEBERG, Kurt BUSCH, Jonas WEICKERT, Lukas SCHMIDT-MENDE, 2016. Structure-induced resonant tail-state regime absorption in polymer : fullerene bulk-heterojunction solar cells. In: Physical Review B. 2016, 93(20), 205305. ISSN 2469-9950. eISSN 2469-9969. Available under: doi: 10.1103/PhysRevB.93.205305

BibTex

@article{Pfadler2016-05-18Struc-34647,
  year={2016},
  doi={10.1103/PhysRevB.93.205305},
  title={Structure-induced resonant tail-state regime absorption in polymer : fullerene bulk-heterojunction solar cells},
  number={20},
  volume={93},
  issn={2469-9950},
  journal={Physical Review B},
  author={Pfadler, Thomas and Kiel, Thomas and Stärk, Martin and Werra, Julia F. M. and Matyssek, Christian and Sommer, Daniel and Boneberg, Johannes and Busch, Kurt and Weickert, Jonas and Schmidt-Mende, Lukas},
  note={Article Number: 205305}
}

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