Enhanced Efficiency of PTB7 : PC₆₁BM Organic Solar Cells by Adding a Low Efficient Polymer Donor

Figure 3

Current density-voltage (J-V) curves under AM 1.5G illumination (100 mW⋅cm⁻²) of PV cells with active layers of PTB7 : PC₆₁BM (1 : 2), pBTTT : PC₆₁BM (1 : 2), and five ternary blend active layers with different PTB7 : pBTTT weight ratios.