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1 results

  • Analytical Study on Piezoelectric Effects on Exciton Dissociation

  • SeongMin Kim, Jaewook Ha, Hyeok Kim, Jin-Baek Kim
  • Journal:
    Communications in Computational Physics / Volume 20 / Issue 1 / July 2016
    Published online by Cambridge University Press:
    22 June 2016, pp. 179-187
    Print publication:
    July 2016

  • We analytically and numerically compute the Onsager dissociation rate (exciton dissociation) on an interface induced by a piezoelectric potential in an inorganicorganic hybrid p-n junction system (ZnO + (poly(p-phenylene vinylene)); PPV). When a positive piezoelectric potential is created at the interface region owing to the deformation of the system, free electrons accumulate at the interface. Hence, screening effects are observed. It is assumed that the electron layer formed at the interface then attracts free holes from the p-type PPV region, which leads to exciton formation, possibly via the Langevin recombination process. The increased exciton density can then contribute to the Onsager dissociation rate, which is maximum around the interface. This paper focuses on the role of piezoelectric effects in promoting exciton formation at the interface and its relation with the exciton dissociation rate.