Method for characterizing bulk recombination using photoinduced absorption

Nora Wilson, Simon Sandén, Oskar Sandberg, Ronald Österbacka

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

3 Citeringar (Scopus)
12 Nedladdningar (Pure)

Sammanfattning

The influence of reaction order and trap-assisted recombination on continuous-wave photoinduced absorption measurements is clarified through analytical calculations and numerical simulations. The results reveal the characteristic influence of different trap distributions and enable distinguishing between shallow exponential and Gaussian distributions and systems dominated by direct recombination by analyzing the temperature dependence of the in-phase and quadrature signals. The identifying features are the intensity dependence of the in-phase at high intensity, PAI∝IγHI, and the frequency dependence of the quadrature at low frequency, PAQ∝ωγLF. For direct recombination, γHI and γLF are temperature independent, and for an exponential distribution, they depend on the characteristic energy Ech as γHI=1/(1+Ech/kT) and γLF=kT/Ech, while a Gaussian distribution shows γHI and γLF as functions of I and ω, respectively.

OriginalspråkOdefinierat/okänt
Sidor (från-till)
TidskriftJournal of Applied Physics
Volym121
Utgåva9
DOI
StatusPublicerad - 2017
MoE-publikationstypA1 Tidskriftsartikel-refererad

Nyckelord

  • photoinduced absorption
  • Organic semiconductors
  • Charge recombination
  • recombination
  • trap-assisted recombination
  • disordered semiconductors
  • optical measurements

Citera det här