In recent years, ternary organic solar cells, which enable extended spectral response range compared to their binary counterpart, have been emerging as an attractive strategy for obtaining impressive photovoltaic properties. In this work, the third component of PBDB-T with a medium bandgap was introduced into PBT7-Th: PC₇₁BM host system to fabricate high efficiency ternary solar cells. It was revealed that PBDB-T not only broadens the light absorption range, but also provides pathway for energy transfer via a Firster resonance energy transfer (FRET) regime. Finally, a champion PCE of 9.45% is achieved for the bulk heterojunction (BHJ) ternary solar cells with 15wt% PBDB-T, which is 11% enhancement in PCE compared with the host binary OSCs. These results indicate that broadening absorption range is an effective strategy to improve OSCs performance.

近年来，三元有机太阳能电池（与二元有机太阳能电池相比具有更大的光谱响应范围）已成为获得令人印象深刻的光伏性能的诱人策略。在这项工作中，具有中等带隙的PBDB-T的第三个组件被引入到PBT7-Th中：PC ₇₁BM主机系统可制造高效的三元太阳能电池。结果表明，PBDB-T不仅拓宽了光吸收范围，而且还通过Firster共振能量转移（FRET）方案为能量转移提供了途径。最终，具有15wt％PBDB-T的体异质结（BHJ）三元太阳能电池的最佳PCE达到9.45％，与主机二进制OSC相比PCE增强了11％。这些结果表明，扩大吸收范围是提高OSC性能的有效策略。