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Degradation of EQE performance of the OPD in air. a) The OPD is based on a PCDTBT:PCBM70 active layer b) The OPD is based on a P3HT:O‐IDTBR active layer. Reproduced with permission.[ 95 ] Copyright 2020, Wiley‐VCH. c) Decrease in PPG signal magnitude along with the number of days. Reproduced with permission.[ 98 ] Copyright 2014, Springer Nature.
