Abstract
The effects of doping a liquid crystalline phthalocyanine derivative, 1,4,8,11,15,18,22,25-octaalkylphthalocyanine (CnPcH2, n = 6, 7), into bulk heterojunction organic thin-film solar cells based on poly(3-hexylthiophene) (P3HT) and 1-(3-methoxy-carbonyl)-propyl-1-1-phenyl-(6,6)C61 (PCBM) were studied. The absorbance spectra and external quantum efficiency spectra in the near-infrared region corresponding to the Q-band of CnPcH2 were improved by doping C6PcH2 or C7PcH2. On the basis of the characteristics of CnPcH2, obtained optical properties, and results of analysis of X-ray diffraction of the composite films of P3HT:CnPcH2:PCBM, we discussed the photovoltaic properties of solar cells with CnPcH2 by taking the micro phase separation in the active layers into consideration.
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