Understanding charge transport in donor/acceptor blends from large-scale device simulations based on experimental film morphologies

Haoyuan Li, Gjergji Sini, Joseph Sit, Adam J. Moulé, Jean Luc Bredas

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Bulk-heterojunction organic photovoltaic (OPV) devices consist of active layers made of electron donor/acceptor blends. Understanding the impact of the blend morphologies on the optoelectronic processes occurring in OPVs is of crucial importance for a complete description of the device physics and the achievement of higher device efficiencies. However, high-resolution morphology data are scarce and theoretical methodologies with the appropriate level of details and affordable computational costs are underdeveloped. As a result, previous device modeling often had to rely on artificially generated blend morphologies, which do not represent those in actual devices. Here, by considering three-dimensional donor/acceptor blend morphologies recently determined via electron tomography, we have established an original approach that allows us to perform device-scale simulations of charge transport in actual blend morphologies. The current characteristics, carrier distributions, and internal current pathways and densities are determined and compared to those based on the artificial morphologies often used in OPV-related studies.

Original languageEnglish (US)
Pages (from-to)601-615
Number of pages15
JournalEnergy and Environmental Science
Volume13
Issue number2
DOIs
StatePublished - Feb 2020
Externally publishedYes

ASJC Scopus subject areas

  • Environmental Chemistry
  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Pollution

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