Improved Performance in Polymer-Fullerene Blend Photovoltaic Cells by Insertion of C60 Interlayer

Enhancement of short current density in polymer solar cells with phthalocyanine tin (IV) dichloride as interfacial layer

“…Consequently, the insertion of SnCl 2 Pc layer can provide an additional donor-acceptor (MEH-PPV/SnCl 2 Pc) junction to dissociate the excitons. This behavior is similar to that of C 60 or its derivatives used as an interfacial layer [28][29][30][31][32][33]. However, it should be noticed that the contact area of the planar heterojunction between SnCl 2 Pc and MEH-PPV in the ITO/PEDOT: PSS/MEH-PPV:PCBM/SnCl 2 Pc/LiF/Al BHJ device is smaller than that in ITO/PEDOT:PSS/MEH-PPV/SnCl 2 Pc/LiF/Al planar bilayered device.…”

“…That is, the J SC ($ 0.02 mA cm À 2 ) of the MEH-PPV/SnCl 2 Pc bilayered device is much smaller than the increase of J SC ($1.0 mA cm À 2 ) of the BHJ device with SnCl 2 Pc interlayer. This phenomenon was also observed on the solar cells, in which C 60 or its derivative was used as cathode interfacial layer [28][29][30][31][32][33]. Thus, there may be other factors contributing to the increased J SC besides the enhanced exciton dissociation efficiency by the SnCl 2 Pc interlayer.…”

“…With this strategy, high short circuit current density (J SC ) and Z of OSCs have been obtained, stemming from the increase of exciton dissociation efficiency, decrease of leakage current, or improvement of charge transport [28][29][30][31][32]. Cell stability and lifetime may also be improved by an appropriate interlayer [32,33].…”