Abstract

Singlet fission (SF) is a process in which two triplet excitons are formed from a single singlet exciton, with a theoretical triplet yield of 200% [1]. This concept has been considered as a promising idea to overcome the established Shockley-Queisser limit of ~30% for a single-junction solar cell [2]. However, realizing high-triplet yields in real physical systems appears challenging due to the various competing processes such as triplet-triplet annihilation, triplet fusion, and singlet recombination [3–6]. A central aspect that has been overlooked in the investigation of SF for solar cells is the dynamics of singlet and triplet excitons near a metal-organic interface.

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