Optical Properties and Modeling of 2D Perovskite Solar Cells

Bin Liu, Chan Myae Myae Soe, Constantinos C. Stoumpos, Wanyi Nie, Hsinhan Tsai, Kimin Lim, Aditya D. Mohite*, Mercouri G. Kanatzidis, Tobin J. Marks, Kenneth D. Singer

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

The optical constants (complex refractive indices) of 2D (BA)2(MA)m-1PbmI3m+1 (BA = CH3(CH2)3NH3 +, MA = CH3NH3 +, m = 2, 3, 4, and 5) perovskite thin films at room temperature are investigated by spectroscopic ellipsometry and UV-Vis spectrophotometry, and compared with those of 3D MAPbI3 (m = ∞). High-frequency dielectric constants (ϵ) derived from ellipsometric fitting for the members of the homologous series increase with increasing thickness of perovskite [(MA)m−1PbmI3m+1]2− slab (m), which qualitatively agrees with the results predicted by a simple quantum well model. Using the optical transfer matrix formalism with the knowledge of optical constants, we model the absorption and optimize the 2D perovskite film thickness for planar-structure solar cells. Moreover, a modified drift-diffusion model is proposed to study the effect of charge-carrier generation and recombination. For 2D perovskite solar cells, the model gives suitable estimates of the charge recombination rate constants, which are found to be one order of magnitude larger than that in the 3D parent compound. Solar cells are fabricated by varying the 2D perovskite layer thickness, and the experimental results verify key aspects of our modeling, enabling the optimization of the device design via optical cavity-tuned absorption enhancement, accounting for charge-carrier recombination.

Original languageEnglish (US)
Article number1700062
JournalSolar RRL
Volume1
Issue number8
DOIs
StatePublished - Aug 1 2017

Keywords

  • 2D perovskites
  • charge-carrier recombination
  • optical cavity effect
  • organic-inorganic planar solar cell
  • thin films

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Energy Engineering and Power Technology
  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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