1. Date of download: 7/3/2016 Copyright © 2016 SPIE. All rights reserved. J/V characteristics under simulated 1.5 AM, 100 mW/cm2 illumination of a fresh solar cell and the same cell after exposure for 20 h. Figure Legend: From: Degradation of phenyl C61 butyric acid methyl ester: poly (3-hexylthiophene) organic photovoltaic cells and structure changes as determined by defect investigations J. Photon. Energy. 2012;2(1):021013-1-021013-12. doi:10.1117/1.JPE.2.021013

2. Date of download: 7/3/2016 Copyright © 2016 SPIE. All rights reserved. Q-DLTS spectra measured in a P3HT: PCBM-based fresh cell using the following parameters: T=300 K, ΔV=3 V and different charging times tC in the range 1 ms (○)–1 s ( ▾ ). Figure Legend: From: Degradation of phenyl C61 butyric acid methyl ester: poly (3-hexylthiophene) organic photovoltaic cells and structure changes as determined by defect investigations J. Photon. Energy. 2012;2(1):021013-1-021013-12. doi:10.1117/1.JPE.2.021013

3. Date of download: 7/3/2016 Copyright © 2016 SPIE. All rights reserved. Q-DLTS spectra measured in a P3HT: PCBM-based fresh cell using the following parameters: T=300 K, ΔV=3 V and different charging times tC in the range 5 ms (○)–100 ms ( ▾ ). Figure Legend: From: Degradation of phenyl C61 butyric acid methyl ester: poly (3-hexylthiophene) organic photovoltaic cells and structure changes as determined by defect investigations J. Photon. Energy. 2012;2(1):021013-1-021013-12. doi:10.1117/1.JPE.2.021013

4. Date of download: 7/3/2016 Copyright © 2016 SPIE. All rights reserved. Resolution of the Q-DLTS spectrum () obtained by using the following parameters: T=300 K, ΔV=3 V, tC=1 s. The components have been computed from Eq. (1) using the relaxation time of each Q-DLTS peak determined from Fig. 2. The fitted curve (○) is shown for comparison. Figure Legend: From: Degradation of phenyl C61 butyric acid methyl ester: poly (3-hexylthiophene) organic photovoltaic cells and structure changes as determined by defect investigations J. Photon. Energy. 2012;2(1):021013-1-021013-12. doi:10.1117/1.JPE.2.021013

5. Date of download: 7/3/2016 Copyright © 2016 SPIE. All rights reserved. Q-DLTS spectra measured in a P3HT: PCBM-based fresh cell using the following parameters: ΔV=3 V, tC=1 s for different temperatures in range 250 K to 310 K. (Inset) Arrhenius plots derived from the data. Figure Legend: From: Degradation of phenyl C61 butyric acid methyl ester: poly (3-hexylthiophene) organic photovoltaic cells and structure changes as determined by defect investigations J. Photon. Energy. 2012;2(1):021013-1-021013-12. doi:10.1117/1.JPE.2.021013

6. Date of download: 7/3/2016 Copyright © 2016 SPIE. All rights reserved. Q-DLTS spectra measured in a P3HT-based fresh cell using the following parameters: T=300 K, ΔV=3 V and different charging times tC in the range 1 ms (○)–1 s ( ▾ ). Figure Legend: From: Degradation of phenyl C61 butyric acid methyl ester: poly (3-hexylthiophene) organic photovoltaic cells and structure changes as determined by defect investigations J. Photon. Energy. 2012;2(1):021013-1-021013-12. doi:10.1117/1.JPE.2.021013

7. Date of download: 7/3/2016 Copyright © 2016 SPIE. All rights reserved. Comparison of the Q-DLTS spectra obtained in P3HT () and P3HT: PCBM (○) fresh devices by using the following parameters: T=300 K, ΔV=3 V, tC=1 s. Figure Legend: From: Degradation of phenyl C61 butyric acid methyl ester: poly (3-hexylthiophene) organic photovoltaic cells and structure changes as determined by defect investigations J. Photon. Energy. 2012;2(1):021013-1-021013-12. doi:10.1117/1.JPE.2.021013

8. Date of download: 7/3/2016 Copyright © 2016 SPIE. All rights reserved. Comparison of the Q-DLTS spectra obtained in fresh () and degraded (○) P3HT: PCBM devices by using the following parameters: temperature T=300 K, charging voltage ΔV=3 V, and charging time tC=1 s. Figure Legend: From: Degradation of phenyl C61 butyric acid methyl ester: poly (3-hexylthiophene) organic photovoltaic cells and structure changes as determined by defect investigations J. Photon. Energy. 2012;2(1):021013-1-021013-12. doi:10.1117/1.JPE.2.021013