Experimentally Calibrated Kinetic Monte Carlo Model Reproduces Organic Solar Cell Current-Voltage Curve

Sebastian Wilken, Tanvi Upreti, Armantas Melianas, Staffan Dahlström, Gustav Persson, Eva Olsson, Ronald Österbacka, Martijn Kemerink

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)
3 Downloads (Pure)

Abstract

Kinetic Monte Carlo (KMC) simulations are a powerful tool to study the dynamics of charge carriers in organic photovoltaics. However, the key characteristic of any photovoltaic device, its current-voltage (J-V) curve under solar illumination, has proven challenging to simulate using KMC. The main challenges arise from the presence of injecting contacts and the importance of charge recombination when the internal electric field is low, i.e., close to open-circuit conditions. Herein, an experimentally calibrated KMC model is presented that can fully predict the J-V curve of a disordered organic solar cell. It is shown that it is crucial to make experimentally justified assumptions on the injection barriers, the blend morphology, and the kinetics of the charge transfer state involved in geminate and nongeminate recombination. All of these properties are independently calibrated using charge extraction, electron microscopy, and transient absorption measurements, respectively. Clear evidence is provided that the conclusions drawn from microscopic and transient KMC modeling are indeed relevant for real operating organic solar cell devices.
Original languageEnglish
Article number2000029
Pages (from-to)
Number of pages8
JournalSolar Rrl
Volume4
Issue number6
DOIs
Publication statusPublished - 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • charge injection
  • kinetic Monte Carlo simulations
  • Charge recombination
  • organic photovoltaics

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