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The I-V characteristic under solar-like illumination of AM1.5 of two OPV cells based on PCBM blend with HMW (red) and LMW (black) P3HT polymers. The insets show the building block of the RR-P3HT polymer and PCBM molecule, respectively. The device photovoltaic characteristic parameters such as short circuit current density, Jsc; open-circuit voltage, Voc; fill-factor, FF; and the power conversion efficiency, PCE in % for HMW RR P3HT are 9.87 mA/cm2, 0.61 V, 68% and 4.0% respectively; and for LMW RR P3HT they are 8.80 mA/cm2, 0.59 V, 70% and 3.4%.
(a) The PL spectrum of the LMW (black line) and HMW (red line) P3HT polymer films measured at 40 K; the 0-0 line, and the 0-1 and 0-2 phonon replicas are assigned. The fits (open circles) were done using Eq. (1). (b) The normalized x-ray diffraction powder pattern from P3HT films of LMW (black line) and HMW (red line), respectively; the (100) band and its harmonics are assigned. The inset shows in more detail the diffraction pattern from the (200) harmonic band.
The PM spectrum of HMW (a) and LMW (b) P3HT films. The PA bands T and T* (triplet excitons), P1 and P2 (polarons), and PB (photo-bleaching) are assigned. (c) The DIA spectrum of P3HT film exposed to iodine vapor. The polaron DIA bands P1 and P2 are assigned.
The ps transient PM spectrum of HMW (a) and LMW (b) P3HT films at t = 150 fs and t = 100 ps, respectively. The bands PA1 (excitons), PAEA (polarons), PB (photo-bleaching), and SE (stimulated emission) are assigned. (c) The PL emission spectrum from HMW P3HT solution excited at various laser powers as indicated, which shows spectral narrowing (laser action) at high excitation intensity.
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