Which mechanism limits the efficiency of organic photovoltaic cells due to singlet exciton dynamics?

💡 Explanation

When singlet excitons are formed upon light absorption in organic photovoltaic cells, triplet-triplet annihilation occurs because collisions between triplet excitons (formed via intersystem crossing) result in energy transfer, quenching one triplet exciton and boosting another to a higher energy level from which it quickly decays, hence reducing charge carriers. Therefore triplet-triplet annihilation decreases efficiency, rather than Förster resonance energy transfer, hole mobility limitations or surface plasmon resonance, which relate to alternative processes.

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