Polymer Photovoltaic Cells: Enhanced Efficiencies via a Network of Internal Donor-Acceptor Heterojunctions

We report efficient photovoltaic cells made with such MEH-PPV:C60 composites

G. Yu; J. Gao; J. C. Hummelen; F. Wudl; A. J. Heeger


Scholarcy highlights

  • Energy conversion efficiencies of photovoltaic cells made with pure conjugated polymers were typically 10-3 to 10-2%,, too low to be used in applications
  • Because the time scale for photoinduced charge transfer is subpicosecond, more than 103 times faster than the radiative or nonradiative decay of photoexcitations, the quantum efficiency of charge separation from donor to acceptor is close to unity
  • Because of the interfacial potential barrier, as demonstrated by the built-in potential in the bilayer D-A heterojunction diode, ultrafast photoinduced charge transfer and charge separation will occur with quantum efficiency approaching unity, leaving holes in the donor phase and electrons in the acceptor phase
  • The substantial enhancement in ╬Ěc achieved with the bicontinuous D-A network material results from the large increase in the interfacial area over that in a D-A bilayer and from the relatively short distance from any point in the polymer to a chargeseparating interface

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