An amino-functionalized conjugated metallopolymer PFEN-Hg was developed as a cathode interlayer for inverted polymer solar cells. The resulting devices exhibited significantly improved performance with power conversion efficiencies exceeding 9%. Moreover, good device performance was achievable with the PFEN-Hg over a wider range of film thickness, likely due to the Hg-Hg interactions and improved π-π stacking.

A small-molecule amino-functionalized organoplatinum(II) complex Pt-N has been developed. The unique properties of Pt-N, including well-defined chemical structure, excellent solubility in environment-friendly polar solvent and good electron extraction to high work-function metals make it a 10 promising candidate for cathode interfacial modification of solution processed multilayer polymer solar cells (PSCs). The resulting PSCs with an ITO/PEDOT:PSS/PTB7:PC 71 BM/interlayer/Al device configuration exhibited significantly improved efficiencies 15 from 3.62% for an unmodified device to 8.89% by using a Pt-N cathode interlayer, benefiting from the dramatic enhancement in open circuit voltage (0.53 V for bare Al PSC to 0.75 V for Pt-N/Al PSC), fill factor (43.58% for bare Al PSC to 72.49% for Pt-N/Al PSC), and slight increase in short-20 circuit current density. These results indicate that Pt-N is a new promising candidate as the cathode interlayer for highly efficient PSCs.

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