Flexible silver grid/PEDOT: PSS hybrid electrodes for large area inverted polymer solar cells
Mao L., Chen Q., Li Y., Li Y., Cai J., Su W., Bai S., Jin Y., Ma CQ., Cui Z., Chen L.
© 2014 Elsevier Ltd. Bulk-heterojunction (BHJ) organic solar cell (OSC) has become a major thrust in solar energy research. It is highly critical to fabricate large-area high-efficiency OSCs in order to maximize the fraction of active area and hence their practical application. In this paper, we have fabricated a promising hybrid transparent electrode consisting of high resolution embedded silver grid (Ag-grid) in hybridization with high conductance poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) (PH1000), which gives both high transparency and low sheet resistance. We further demonstrate its application in large-area high efficiency OSCs. By carefully tuning the properties of the Ag-grid based hybrid electrodes, the sheet resistance is further reduced to as low as 1.2Ωsq-1. Inverted OSCs with device area of 1.21cm2 exhibited a record PCE of 3.36% for poly(3-hexylthiophene):[6,6]-phenyl-C61 butyric acid methyl ester (P3HT:PC61BM) blend film as the active layer; and the PCE of PTB7:PC71BM devices reached 5.85%. To the best of our knowledge, the PCE of 5.85% is the highest in large-area flexible OSCs (>1cm2) till date.