Date of download: 7/3/2016 Copyright © 2016 SPIE. All rights reserved. The lumped circuit model used to analyze the organic photovoltaics devices in this study. Figure Legend: From: Current-voltage analysis of annealing effects of poly(3-hexlythiophene) and phenyl- C61-butyric acid methyl ester organic solar cells J. Photon. Energy. 2013;3(1): doi: /1.JPE

Date of download: 7/3/2016 Copyright © 2016 SPIE. All rights reserved. (a) The XRD curves of annealed devices, arranged from 30°C (bottom) to 180°C (top). Note the increase of intensity and decrease of peak width upon annealing. (b) The increase in crystallite size with respect to annealing temperature indicates that the annealing increases the crystallinity. Figure Legend: From: Current-voltage analysis of annealing effects of poly(3-hexlythiophene) and phenyl- C61-butyric acid methyl ester organic solar cells J. Photon. Energy. 2013;3(1): doi: /1.JPE

Date of download: 7/3/2016 Copyright © 2016 SPIE. All rights reserved. (a) The current-voltage (JV) curve of an as prepared device tested in the dark and light. (b) The JV curve of a device that has been annealed at 180°C for 20 min. Figure Legend: From: Current-voltage analysis of annealing effects of poly(3-hexlythiophene) and phenyl- C61-butyric acid methyl ester organic solar cells J. Photon. Energy. 2013;3(1): doi: /1.JPE

Date of download: 7/3/2016 Copyright © 2016 SPIE. All rights reserved. The VOC, JSC, and efficiency of one set of devices fabricated in this study. The efficiency increase is mainly due to the JSC increase. FF was relatively unrelated to annealing, remaining between 40 and 55%. Figure Legend: From: Current-voltage analysis of annealing effects of poly(3-hexlythiophene) and phenyl- C61-butyric acid methyl ester organic solar cells J. Photon. Energy. 2013;3(1): doi: /1.JPE

Date of download: 7/3/2016 Copyright © 2016 SPIE. All rights reserved. The fit (green stars) can be seen to match up well with both dark (a) and light (b) data from a device annealed at 180°C. Figure Legend: From: Current-voltage analysis of annealing effects of poly(3-hexlythiophene) and phenyl- C61-butyric acid methyl ester organic solar cells J. Photon. Energy. 2013;3(1): doi: /1.JPE

Date of download: 7/3/2016 Copyright © 2016 SPIE. All rights reserved. dJ/dV in the dark and light. The intercept at V=0 gives the shunt conductivity G. (a) An as cast device. The large hump indicates a barrier limiting conductivity around V=0.5 V. (b) A device annealed at 180°C for 20 min shows much more ideal behavior with no humps. Figure Legend: From: Current-voltage analysis of annealing effects of poly(3-hexlythiophene) and phenyl- C61-butyric acid methyl ester organic solar cells J. Photon. Energy. 2013;3(1): doi: /1.JPE

Date of download: 7/3/2016 Copyright © 2016 SPIE. All rights reserved. dJ/dV versus V as a function of annealing temperatures in devices (a) annealed after Al evaporation and (b) annealed before Al evaporation. Figure Legend: From: Current-voltage analysis of annealing effects of poly(3-hexlythiophene) and phenyl- C61-butyric acid methyl ester organic solar cells J. Photon. Energy. 2013;3(1): doi: /1.JPE

Date of download: 7/3/2016 Copyright © 2016 SPIE. All rights reserved. Device series resistance as a function of annealing temperature. The decreases in series resistance are significant, in some cases a factor of 8. Each line is a single series of devices, annealed after (post), before (pre), and 10 min before and 10 min after (pre/post) the evaporation of the Al contact. Figure Legend: From: Current-voltage analysis of annealing effects of poly(3-hexlythiophene) and phenyl- C61-butyric acid methyl ester organic solar cells J. Photon. Energy. 2013;3(1): doi: /1.JPE

Date of download: 7/3/2016 Copyright © 2016 SPIE. All rights reserved. The diode ideality factor, n, which corresponds to recombination, as a function of annealing temperature. Figure Legend: From: Current-voltage analysis of annealing effects of poly(3-hexlythiophene) and phenyl- C61-butyric acid methyl ester organic solar cells J. Photon. Energy. 2013;3(1): doi: /1.JPE

Date of download: 7/3/2016 Copyright © 2016 SPIE. All rights reserved. The lifetime mobility product, as found from Eq. (4), increases upon annealing due to increases in carrier mobility and crystallinity. Figure Legend: From: Current-voltage analysis of annealing effects of poly(3-hexlythiophene) and phenyl- C61-butyric acid methyl ester organic solar cells J. Photon. Energy. 2013;3(1): doi: /1.JPE

Date of download: 7/3/2016 Copyright © 2016 SPIE. All rights reserved. The dark saturation current J0 is quite noisy, though the average values lead to a decrease. Figure Legend: From: Current-voltage analysis of annealing effects of poly(3-hexlythiophene) and phenyl- C61-butyric acid methyl ester organic solar cells J. Photon. Energy. 2013;3(1): doi: /1.JPE

Date of download: 7/3/2016 Copyright © 2016 SPIE. All rights reserved. The carrier collection efficiency, normalized to η=1 at V-RJ=−1. (a) As cast device with a curve indicative of high recombination. (b) Annealing at 180°C leads to a curve indicating low recombination. Figure Legend: From: Current-voltage analysis of annealing effects of poly(3-hexlythiophene) and phenyl- C61-butyric acid methyl ester organic solar cells J. Photon. Energy. 2013;3(1): doi: /1.JPE