Abstract
A higher Voc is achieved in Ir(FOtbpa)3-based devices despite a lower energy charge transfer state compared to Ir(Ftbpa)3-based devices, which is attributed to the reduced radiative and non-radiative recombination.
Highlights
A higher Voc is achieved for Ir(FOtbpa)3-based devices despite a lower ECT, which is attributed to the reduced radiative and non-radiative recombination loss
Solar energy is considered to be a promising renewable energy source to address the increasing worldwide energy demands
To give readers an intuitive understanding of the charge generation process in T-organic photovoltaic devices (OPVs), the energetic states of the Ir(Ftbpa)[3]: phenyl-C71-butyric acid methyl ester (PC71BM) blend is presented in Fig. 1d where the singlet and triplet states of Ir(Ftbpa)[3] were calculated in a previous report,[34] and the energies of the charge transfer (CT) states is obtained from the Fourier-transform photocurrent spectroscopy (FTPS)-External quantum efficiency (EQE) measurement
Summary
A higher Voc is achieved for Ir(FOtbpa)3-based devices despite a lower ECT, which is attributed to the reduced radiative and non-radiative recombination loss. To give readers an intuitive understanding of the charge generation process in T-OPVs, the energetic states of the Ir(Ftbpa)[3]: PC71BM blend is presented in Fig. 1d where the singlet and triplet states of Ir(Ftbpa)[3] were calculated in a previous report,[34] and the energies of the CT states is obtained from the FTPS-EQE measurement.
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