Blend morphology is crucial for the efficiency and stability of organic solar cells. Exploring and understanding the correlations between is meaningful and greatly desired. In this work, based on polymer donor (PTB7-Th), fullerene and non-fullerene acceptors (PC₇₁BM and Y6), we systematically study the influence of ternary strategy and solvent system on device performance and stability. It is found that insufficient and excessive phase separation of blend could result in the depressed performance of corresponding devices. Appropriate phase separation/blend morphology can be achieved by utilizing a ternary strategy or suitable solvent. Chloroform-processed ternary blend PTB7-Th:Y6:PC₇₁BM delivers efficiency of 9.55%, with dramatically enhanced J_SC of 24.68 mA cm⁻² due to optimized absorption, blend morphology and optoelectronic properties. More importantly, superior device stability is demonstrated for the optimal ternary device under both thermal stress and maximum power point operation, by maintaining 80% of initial efficiency at 85 °C for 880 h and presenting almost zero efficiency decay in 200 h under MPP operation.

混合形态对于有机太阳能电池的效率和稳定性至关重要。探索和理解之间的相关性是有意义的，也是非常需要的。在这项工作中，我们基于聚合物供体（PTB7-Th）、富勒烯和非富勒烯受体（PC ₇₁ BM 和 Y6），系统地研究了三元策略和溶剂体系对器件性能和稳定性的影响。发现混合物的不充分和过度的相分离会导致相应器件的性能下降。适当的相分离/混合形态可以通过利用三元策略或合适的溶剂来实现。氯仿处理的三元混合物 PTB7-Th:Y6:PC ₇₁ BM 提供 9.55% 的效率，并显着增强了 J _SC24.68 mA cm ^-2由于优化的吸收、混合形态和光电特性。更重要的是，最佳三元器件在热应力和最大功率点操作下均表现出优异的器件稳定性，在 85°C 下保持 80% 的初始效率达 880 小时，并在 MPP 操作下在 200 小时内呈现几乎为零的效率衰减。