Mobile Ion Concentration Measurement and Open-Access Band Diagram Simulation Platform for Halide Perovskite Solar Cells

Caleb Boyd, Jixian Xu, Rohit Prasanna, Luca Bertoluzzi, Nicholas Rolston, Brian O'Regan, Michael McGehee

Research output: Contribution to journalArticlepeer-review

127 Scopus Citations

Abstract

We propose two approaches to compute the band diagram of highly efficient perovskite solar cells, both based on the migration of a single-mobile ion (halide vacancies). The first is a full analytical approach to quickly calculate the main features of the perovskite band diagram and easily extract the mobile vacancy concentration from experimental data. The second approach is an online-open-access platform that can be used by anyone to accurately simulate their own band diagram. We combine the first approach with current transient measurements to extract the mobile ion concentration for six different perovskite compositions - including perovskite solar cells with power conversion efficiencies exceeding 19%. For the devices measured herein, we obtain ion concentrations in the range 7 x 10^16-5 x 10^17cm^-3. We use the second approach to quantitatively discuss the implications of the mobile ion concentrations we measured in terms of device performance and stability.
Original languageAmerican English
Pages (from-to)109-127
Number of pages19
JournalJoule
Volume4
Issue number1
DOIs
StatePublished - 2020

NREL Publication Number

  • NREL/JA-5900-75900

Keywords

  • drift-diffusion modeling
  • energy diagram
  • mobile ion concentration
  • perovskite solar cells

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