Polymer solar cells (PSCs) based on a ternary bulk heterojunction (BHJ) active layer consisting of the conjugated polymer PTB7-Th as a donor and two nonfullerene acceptors i.e., a wide bandgap acceptor based on perylene-diimide (PDI) unit, TPhEPDI-4 and narrow bandgap A-D-A acceptor denoted as BThIND-Cl. The LUMO offset between donor and acceptor materials used for the binary PTB7-Th:BThIND-Cl BHJ is about 0.34 eV, so there is still scope to narrow this offset and further reduce the energy loss through the incorporation of a second acceptor in ternary active layer of PSCs. interesting when TPhEPDI-4 is used as the second acceptor, there is an increase in open-circuit voltage (V_OC) for the PSCs based on PTB7-Th:TPhEPDI-4:BThIND-Cl ternary system due to the creation of a cascade LUMO energy level alignment by TPhEPDI-4. After adjusting the weight ratios in PTB7-Th:TPhEPDI-4:BThIND-Cl ternary BHJ layer to 1: 0.2:1.0 and subsequent solvent vapor annealing, we have achieved power conversion efficiency of 16.40 % (energy loss of 0.53 eV and open circuit voltage of 0.97 V) which is higher than that for binary PTB7-Th:BThIND-Cl (1:1.2) (14.18 % with energy loss and open circuit voltage of 0.58 eV and 0.91 V).

基于三元本体异质结 (BHJ) 活性层的聚合物太阳能电池 (PSC)，由作为供体的共轭聚合物 PTB7-Th 和两个非富勒烯受体组成，即基于苝二酰亚胺 (PDI) 单元的宽带隙受体 TPhEPDI- 4 和表示为 BThIND-Cl 的窄带隙 ADA 受体。用于二元 PTB7-Th:BThIND-Cl BHJ 的供体和受体材料之间的 LUMO 偏移约为 0.34 eV，因此仍有空间缩小该偏移并通过在三元活性物质中加入第二个受体来进一步降低能量损失PSC 层。有趣的是，当 TPhEPDI-4 用作第二个受体时，开路电压 ( V _OC) 对于基于 PTB7-Th:TPhEPDI-4:BThIND-Cl 三元系统的 PSC，由于 TPhEPDI-4 产生了级联 LUMO 能级对齐。在将 PTB7-Th:TPhEPDI-4:BThIND-Cl 三元 BHJ 层中的重量比调整为 1:0.2:1.0 并随后进行溶剂蒸汽退火后，我们实现了 16.40% 的功率转换效率（0.53 eV 的能量损失和开路）电压为 0.97 V)，高于二元 PTB7-Th:BThIND-Cl (1:1.2)（14.18 %，能量损失和开路电压为 0.58 eV 和 0.91 V）。