Optimum Luminescent Down-Shifting Properties for High Efficiency and Stable Perovskite Solar Cells

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Abstract

In recent years, the discovery of the excellent optical and electrical properties of perovskite solar cells (PSCs) made them a main focus of research in photovoltaics, with efficiency records increasing astonishingly fast since their inception. However, problems associated with the stability of these devices are hindering their market application. UV degradation is one of the most severe issues, chiefly caused by TiO 2 's photogenerated electrons that decompose the perovskite absorber material, coupled with the additional intrinsic degradation of this material under UV exposure. The solution presented here can minimize this effect while boosting the cells' generated photocurrent, by making use of combined light-trapping and luminescent down-shifting effects capable of changing the harmful UV radiation to higher wavelengths that do not affect the stability and can be effectively "trapped" in the cell. This work focuses in the optimization of the photocurrent gains that can be attained by emulating the changed spectrum resulting from applying down-shifting media as encapsulant in photonic-enhanced PSCs, as well as the reduction in the harmful effects of UV radiation on the devices. Such optimized photonic solution allows current enhancement while reducing the harmful UV photocarrier generation both in the TiO 2 (by 1 order of magnitude) and in the perovskite (by 80%) relative to a standard PSC without light management.

Original languageEnglish
Pages (from-to)2930-2938
Number of pages9
JournalACS Applied Energy Materials
Volume2
Issue number4
DOIs
Publication statusPublished - 22 Apr 2019

Keywords

  • luminescent down-shifting
  • perovskite solar cells
  • photocurrent enhancement
  • photonics
  • UV stability

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