In Figure , we test the stability of the IHO electrodes as well as the PbS QD films over typical measurement durations of 14 h in TBAHFP/MeCN-d 3 without applying a bias. We find two notable changes: 1) The IHO absorption increases and 2) the excitonic transition of the PbS QDs undergoes a hypsochromic shift. Pure MeCN-d 3 has no significant effect (see Figure ).