Impact of dye interlayer on the performance of organic photovoltaic devices

Lai, S. L.; Lo, M. F.; Chan, M. Y.; Lee, C. S.; Lee, S. T.
October 2009
Applied Physics Letters;10/12/2009, Vol. 95 Issue 15, p153303
Academic Journal
The influences of buffer interlayer at the donor/acceptor interface on the open circuit voltage (VOC) of typical copper phthalocyanine (CuPc)/C60 organic photovoltaic devices are studied. Six fluorescent dyes with progressively increasing ionization potentials (IP) were used to investigate the factors influencing the VOC. The short-circuit current and fill factor of CuPc/C60 device incorporating dye interlayer are lower than those of standard bilayer device. On the other hand, the VOC increases linearly with the IP of dye material and falls off when the IP is equal to or greater than 5.6 eV, in which the energy offset between the highest occupied molecular orbitals at the interlayer/C60 heterojunction is smaller than the C60 exciton binding energy. The findings underscore the importance of energy offsets in photovoltaic responses.


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