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We investigate the viability of highly efficient organic solar cells (OSCs)based on non-fullerene acceptors (NFA) by taking into consideration efficiencyloss channels and stability issues caused by triplet excitons (TE) formation.OSCs based on a blend of the conjugated donor polymer PBDB-T and ITIC asacceptor were fabricated and investigated with electrical, optical andspin-sensitive methods. The spin-Hamiltonian parameters of molecular TEs andcharge transfer TEs in ITIC e.g., zero-field splitting and charge distribution,were calculated by Density Functional Theory (DFT) modelling. In addition, theenergetic model describing the photophysical processes in the donor-acceptorblend was derived. Spin-sensitive photoluminescence measurements prove theformation of charge transfer (CT) states in the blend and the formation of TEsin the pure materials and the blend. However, no molecular TE signal isobserved in the completed devices under working conditions by spin-sensitiveelectrical measurements. The absence of a molecular triplet state populationallows to eliminate a charge carrier loss channel and irreversiblephotooxidation facilitated by long-lived triplet states. These resultscorrelate well with the high power conversion efficiency of thePBDB-T:ITIC-based OSCs and their high stability.

On the Absence of Triplet Exciton Loss Pathways in Non-Fullerene Acceptor based Organic Solar Cells