Spatial Distribution of Solar Cell Parameters in Multigrain Halide-Perovskite Films: A Device Model Perspective

Sapir Bitton, Qingzhi An, Yana Vaynzof, Nir Tessler

Research output: Contribution to journalArticlepeer-review

Abstract

The polycrystalline nature of perovskite thin films suggests that the nonradiative recombination losses may be grain size dependent. We use measured grain size distributions of methylammonium lead triiodide layers to describe the macroscopic solar cell as composed of multiple single grain size cells operating in parallel. Using a model, we show that the grain size distribution results in spatial dispersion of the local open-circuit voltage (0.9-1.15 V), fill factor (50-82%), and power conversion efficiency (7.5-19%). When the device is held at open-circuit voltage, there is significant current exchange between large and small grains. Smaller grains are a “parasitic shunt” for the larger grains.

Original languageEnglish
Pages (from-to)8709-8714
Number of pages6
JournalACS Applied Energy Materials
Volume4
Issue number9
DOIs
StatePublished - 27 Sep 2021

Keywords

  • grains
  • modeling
  • open circuit
  • perovskite
  • solar cell

All Science Journal Classification (ASJC) codes

  • Chemical Engineering (miscellaneous)
  • Energy Engineering and Power Technology
  • Materials Chemistry
  • Electrical and Electronic Engineering
  • Electrochemistry

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