How High Local Charge Carrier Mobility and an Energy Cascade in a Three‐Phase Bulk Heterojunction Enable >90% Quantum Efficiency

Charge generation in champion organic solar cells is highly efficient in spite of low bulk charge-carrier mobilities and short geminate-pair lifetimes. In this work, kinetic Monte Carlo simulations are used to understand efficient charge generation in terms of experimentally measured high local charge-carrier mobilities and energy cascades due to molecular mixing.