was recorded for the best performing solar cell (Figure ), a modest value which can be nevertheless considered encouraging considering that such rylene diimide have never been studied as NFA before. To estimate the contributions of the donor and acceptor to the generation of photocurrent, an extern quantum efficiency (EQE) spectrum was recorded (Figure ), revealing a spectrum similar to Figure . Remarkably, the contribution of the NFA 9 to the generation of the photocurrent is higher than its contribution to the overall absorbance of light in thin film observed in Figure , revealing a more balanced contribution of both components than expected. Soluble mono-annulated materials 2a, 2b and 6 were used as active layers in solution-processed bottomgate top-contact (BGTC) Organic Field-Effect Transistors (OFETs). Their preparation and testing are detailed in the Supplementary Information (Table and Figure S51-52). Only compound 6 displayed a field-effect behavior but with good average V Th of 14 V, poor I on /I off and an average electron mobility of µ e = 3.06 × 10 -5 cm² V -1 s -1 . Again, these results are promising considering the fact that such O-doped BACDs have never been investigated before as active layers in solution-processed BGTC OFETs.