Common use of Device Performance Clause in Contracts

Device Performance. The ionization potentials and optical bandgaps of the T8TBTs were estimated respectively from cyclic voltammetry and the onset of optical absorption in order to compare them with other photovoltaic materials. (Table 1) The energy levels thus computed make the T8TBTs suitable for polymer:PCBM BHJ solar cells and such devices were made in the standard architec- ture (Glass/ITO/PEDOT:PSS/active layer/Al). The best devices were obtained at polymer:PCBM ratios of 1:3. As could have been predicted from the energy levels, the T8TBTs have a rather low and very similar open-circuit voltage under AM1.5G at 1000 W m—2 of about 0.6 V (Fig. 3b). This value is similar to what is obtained for P3HT:PCBM blends. Nevertheless the three T8TBTs perform very differently. T8TBT-0 has a broader absorption spectrum and better external quantum efficiency (EQE) under monochromatic light (Fig. 3a) resulting in a strong increase in Emission peak, solution (nm) Emission peak, film (nm) PLQE in solution (%) PLQE in film (%) ▇▇▇▇▇▇ shift in solution (eV) ▇▇▇▇▇▇ shift in film (eV) 725 700 670 8 16 22 2 11 22 0.38 0.49 0.63 0.46 0.52 0.62