Light-induced EPR (LEPR) and out-of-phase electron spin echo (ESE) techniques were applied to trace the difference of charge generation and recombination processes between highly efficient ternary OPV blend PBDB-T/ITIC:PC₇₀BM and the corresponding binary blends PBDB-T/ITIC and PBDB-T/PC₇₀BM. The average charge trap depth measured from LEPR decay traces decreases in the series PBDB-T/ITIC, PBDB-T/PC₇₀BM, PBDB-T/ITIC:PC₇₀BM. As it is evident from the out-of-phase ESE, the initial electron-hole distance within the charge-transfer state upon its formation increases in this series. The former effect facilitates charge transport, in accordance with increase of the electron mobility for the ternary blend revealed previously. The latter effect leads to reduced geminate recombination. Both effects are suggested to improve the power conversion efficiency of the ternary blends. Presumably, they originate from modification of the PBDB-T/ITIC blend morphology by addition of small amount of PC₇₀BM.

应用光诱导EPR（LEPR）和异相电子自旋回波（ESE）技术来跟踪高效三元OPV共混物PBDB-T / ITIC：PC ₇₀ BM与相应的三元OPV共混物之间电荷产生和重组过程的差异二元混合物PBDB-T / ITIC和PBDB-T / PC ₇₀ BM。从LEPR衰减迹线测得的平均电荷陷阱深度在PBDB-T / ITIC，PBDB-T / PC _70系列， BM，PBDB-T / ITIC：PC _{70系列中降低}BM。从异相ESE可以明显看出，电荷转移状态在形成时的初始电子-空穴距离按此系列增加。根据先前揭示的三元共混物的电子迁移率的增加，前一种效应促进了电荷传输。后一种效应导致降低的双胞胎重组。建议两种效果都可以提高三元共混物的功率转换效率。据推测，它们源于通过添加少量PC ₇₀ BM来改变PBDB-T / ITIC共混物的形态。