Approaching Perfect Light Incoupling in Perovskite and Silicon Thin Film Solar Cells by Moth Eye Surface Textures

Wayesh Qarony, Mohammad Ismail Hossain, Rahul Dewan, Stefan Fischer, V. Benno Meyer-Rochow, Alberto Salleo, Dietmar Knipp, Yuen Hong Tsang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

27 Citations (Scopus)


Solar cells with increased short-circuit current density and energy conversion efficiency can be realized by integrating moth eye textures in the design of perovskite and amorphous silicon thin film solar cells. Broadband light incoupling in solar cells can be achieved by using hexagonally arranged arrays of nipples or domes with parabolically shaped surface profiles. The moth eye surface texture represents a refractive index grating that allows for an efficient incoupling of light in the solar cell while minimizing reflection losses. The light incoupling is studied for perovskite and amorphous silicon solar cells. Perovskite has a rather low refractive index of ≈2.5, while amorphous silicon exhibits a refractive index of ≈4.5 comparable to that of crystalline silicon. Due to largely different refractive indices, different device designs must be selected to allow for an efficient light incoupling in the solar cell. 3D finite-difference time-domain simulations are used for the optical modeling. Design guidelines are provided on how to realize perovskite and silicon thin film solar cells with high quantum efficiency and short-circuit current by using moth eye textures.

Original languageEnglish
Article number1800030
JournalAdvanced Theory and Simulations
Issue number8
Publication statusPublished - 1 Aug 2018


  • amorphous silicon
  • light incoupling
  • moth eye texture
  • perovskites
  • solar cells

ASJC Scopus subject areas

  • General
  • Modelling and Simulation
  • Numerical Analysis
  • Statistics and Probability

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