Charge Transfer States at Donor-Acceptor Heterojunctions: The role of morphology on dissociation efficiency and device lifetimes

Abstract

The generation of photocurrent at organic donor-acceptor (D-A) junctions occurs via formation of a charge transfer (CT) exciton, aka the polaron pair (PR). The exciton generated by optical absorption diffuses to the D-A junction where it's driven into the CT state Coulombically bound across the heterojunction (HJ), This "indirect" PP state is a precursor to the free charge separated (CS) state resulting in photocurrent in the external circuit. This program goals: understanding CT state photophysics and its dependence on donor and acceptor materials combinations and film morphology; achieve --100% internal quantum efficiency at small molecule D-A junctions; find relationship between device lifetime/photophysical properties.

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Document Details

Document Type
Technical Report
Publication Date
Dec 29, 2020
Accession Number
AD1122786

Entities

People

  • Stephen R. Forrest

Organizations

  • Board of Regents of the University of Michigan

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Advanced Materials
  • Cells
  • Charge Transfer
  • Computational Science
  • Current Density
  • Density Functional Theory
  • Diffraction
  • Efficiency
  • Energy Levels
  • Fermi Levels
  • Films
  • Materials
  • Quantum Efficiency
  • Scattering
  • Solar Cells
  • Spectra
  • Three Dimensional

Fields of Study

  • Physics

Readers

  • Materials Science and Engineering.
  • Polymer Science and Technology
  • Semiconductor Device Technology

Technology Areas

  • Microelectronics
  • Quantum Computing