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. 2015 Dec 14;6:8929. doi: 10.1038/ncomms9929

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(a) Light J–V characteristics of a fully optimized PTB7-Th:PC₇₁BM solar cell (J_SC=19.0 mA cm⁻², V_OC=0.794 V, FF=71.2%, PCE=10.74%) together with certified data for a 9.6% PCE cell fabricated with a simple soft-baking step (without the optimized PEOz annealing step). (b) Change of normalized solar cell parameters for PEOz(4) and PEOz-free solar cells as a function of exposure time under continuous AM1.5G, 100 mW cm⁻² illumination. The inset photographs in the V_OC graph show the striking colour change of the PTB7-Th:PC₇₁BM BHJ that accompanies the decrease in performance.