Efficiency of exciton splitting in organic photovoltaic cells within EQE spectrum

The paper presents a procedure of estimating the efficiency of exciton splitting at ED/EA interface. The procedure consists in evaluation of splitting of excitons into electron-hole pairs on the basis of the external quantum efficiency spectra of planar cells and spectra of absorbance of active organic layers. The fitting parameters are the exciton splitting probabilities at ED/EA interface. The presented procedure was applied to two different photovoltaic systems: ITO/MoO3/DBP/PTCBI/BCP/Ag and ITO/MoO3/DBP/F16ZnPc/BCP/Ag with quite similar energy diagrams at the ED/EA interface. The analysis performed led us to the conclusion that only the DBP/ PTCBI interface can be considered attractive for organic photovoltaics and organic photodetection, while the DBP/F16ZnPc interface does not show any favourable properties for such applications.

Automated summary

The paper presents a method for estimating the efficiency of exciton splitting at the ED/EA interface. The method involves evaluating the splitting of excitons into electron-hole pairs based on the external quantum efficiency spectra of planar cells and the absorbance spectra of active organic layers. The analysis indicates that only the DBP/PTCBI interface is attractive for organic photovoltaics and organic photodetection.