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. 2018 Feb 5;3(2):1522–1528. doi: 10.1021/acsomega.7b01524

Table 1. Summary of PCBM Concentration in the Different Polymer Layers, Contact Angle with Water of the Polymer Layers, and Interface Free Energy between PCBM and the Polymer Layers Calculated Using Contact Anglea.

  PCBM concentration (wt %) water contact angle (deg) interface free energy (mJ/m2)
P3HT 0.89–1.4 106.3 (0.4) 4.42
ran-P3HT 5.6–6.1 105.8 (0.2) 4.26
PTB7 1.2–1.4 98.2 (0.4) 2.22
PS <0.01 88.4 (1.8) 0.53
a

Numbers in parentheses are standard deviations of the four measured values.