Table 1 A summary of measured values for PTB7, PC71BM, P3HT and PC61BM.

From: The origin of high PCE in PTB7 based photovoltaics: proper charge neutrality level and free energy of charge separation at PTB7/PC71BM interface

Sample

IE

EA

Et

Eopt

Eexc

PTB7

5.05

2.80

2.25

1.6346

0.62

PC71BM

5.85

3.95

1.90

1.8048

0.10

P3HT

4.57

2.05

2.5250

1.9047

0.62

PC61BM

6.02

4.02

2.0050

1.8049

0.20

  1. (Column 1): Ionization energy (IE) of all materials used in this work. (Column 2): Electron affinity (EA) by subtracting transport band gap from measured IE. (Column 3): Transport band gap (Et) determined by UPS and IPES. (Column 4): Optical band gap (Eopt) determined by UV-Vis absorption spectra. (Column 5): Calculated exciton binding energy (Eexc) by subtracting optical band gap from transport band gap. (All values were measured in current work unless otherwise indicated).
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