Coulomb barrier for charge separation at an organic semiconductor interface.

  title={Coulomb barrier for charge separation at an organic semiconductor interface.},
  author={Matthias Muntwiler and Qingxin Yang and William A Tisdale and Xiaoyang Zhu},
  journal={Physical review letters},
  volume={101 19},
Charge transfer (CT) excitons across donor-acceptor interfaces are believed to be barriers to charge separation in organic solar cells, but little is known about their physical characteristics. Here, we probe CT excitons on a crystalline pentacene surface using time-resolved two-photon photoemission spectroscopy. CT excitons of 1s, 2s, and 3s characters are bound by Coulomb energies of 0.43, 0.21, 0.12 eV, respectively, in agreement with quantum mechanical modeling. The large binding energy of… CONTINUE READING
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