Controllable Anion Doping of Electron Acceptors for High-Efficiency Organic Solar Cells

Charge transport of organic semiconductors remains as oneof the performance bottlenecks for organic optoelectronics, especially fororganic solar cells (OSCs). Herein, we demonstrate that Lewis base aniondoping allows effectively modulating the charge transport capabilities of avariety of electron acceptors and the corresponding optoelectronic devices.It has enabled power conversion efficiencies of 18.16% for OSCs bearing chemical dopants in active layers. We have proven that the controllable n-doping of non-fullerene acceptors is accomplished via the solid-stateanion-induced electron transfer, which originally remains dormant in the solution of Lewis base anion and organic semiconductor. Hence, Lewisbase anion doping presents advantages for the solution-processing ofdopant/organic semiconductor mixtures. Overall, this work provides aneffective, yet feasible approach for doping solution-processed semi-conductors for high-performance optoelectronics

Automated summary

This study demonstrates that Lewis base anion doping effectively modulates the charge transport capabilities of various electron acceptors, leading to power conversion efficiencies of up to 18.16% for organic solar cells with chemical dopants. The controllable n-doping of non-fullerene acceptors is achieved through solid-state anion-induced electron transfer, presenting advantages for solution-processing of dopant/organic semiconductor mixtures.