Device annealing effect in organic solar cells with blends of regioregular poly(3-hexylthiophene) and soluble fullerene
Abstract
Here we report enhanced efficiency bulk heterojunction organic solar cells using blend films of regioregular poly(3-hexylthiophene) (P3HT) and 1-(3-methoxycarbonyl)-propyl-1-phenyl-(6,6)C61 (PCBM) that are subjected to a thermal annealing process. Blend films (P3HT:PCBM=1:1 by weight) were prepared using chlorobenzene and 1,2-dichlorobenzene in order to investigate the role of the solvent. Irrespective of the chosen solvent, the optimal device annealing temperature was found to be 140 °C. The highest power conversion efficiency, 3% under air mass 1.5 simulated solar illumination (100mW/cm2), was achieved by device annealing at 140 °C for 15 min using blend films prepared from chlorobenzene (2.3% for 1,2-dichlorobenzene).
- Publication:
-
Applied Physics Letters
- Pub Date:
- February 2005
- DOI:
- 10.1063/1.1861123
- Bibcode:
- 2005ApPhL..86f3502K
- Keywords:
-
- 84.60.Jt;
- 85.65.+h;
- 61.72.Cc;
- Photoelectric conversion: solar cells and arrays;
- Molecular electronic devices;
- Kinetics of defect formation and annealing