The simultaneous improvement of power conversion efficiency (PCE) and thermal stability is a critical scientific challenge in advancing the commercial applications of polymer solar cells. To address this challenge, a dumbbell‐shaped dimeric acceptor, DT19, is successfully designed and synthesized. It is incorporated as a third component into the PM1:BTP‐eC9 system. This ternary strategy demonstrates a synergistic enhancement of the PCE and thermal stability of the host binary system. In particular, the PM1:BTP‐eC9:DT19 system maintains a PCE of over 90% even after heating at 120 °C for 200 h. Additionally, the dimer‐doping ternary strategy exhibits excellent generality for the other four Y‐series systems and outperforms ternary systems containing alloy‐like acceptors in terms of thermal stability. It is because DT19, with its hinge‐like structure, can form a semi‐alloy acceptor with the host acceptor, leading to strong interchain entanglement with the polymer donor, thus overcoming phase separation and excessive aggregation under thermal stress. This new type of dimeric material, which can synergistically enhance the device efficiency and thermal stability of active layers, presents promising application prospects.
To facilitate the potential applications of organic solar cells (OSCs), highly cost-effective processing fabrication of solar cells and modules is an important prerequisite. However, process development has received little attention...
Further advancement of all-polymer solar cells (all-PSCs) requires a new polymerization design strategy to develop ideal polymer acceptors that possess and retain maximally the advantages of narrow bandgap non-fullerene acceptor...
Obtaining an admirably modified vertical phase separation of the active layer for all‐polymer solar cells (all‐PSCs) to facilitate charge generation, charge transfer and transport properties are a prerequisite for achieving high performance. Herein, the active layer of all‐PSCs is finely manipulated by combining a ternary blend strategy with a layer‐by‐layer (LbL) process. Based on the LbL‐processed PM6/PYT‐1S1Se host binary all‐PSCs, a chlorinated polymer acceptor PYT‐1S1Se‐4Cl is designed and introduced into the host system for rationally controlling blend morphology with ordered molecular stacking and suitable vertical distribution. The optimized bulk microstructure of the ternary system is not only beneficial to the charge generation and charge transport properties, but also can significantly reduce the nonradiative energy loss that occurs in the LbL‐type ternary blend. Thus, the LbL‐type PM6/(PYT‐1S1Se:PYT‐1S1Se‐4Cl) ternary all‐PSCs exhibit a promising power conversion efficiency (PCE) of 17.74%, which is higher than the corresponding binary systems (PCE = 16.86% for PM6/PYT‐1S1Se and PCE = 15.83% for PM6/PYT‐1S1Se‐4Cl), indicating the special merits of material design and processing technology. Overall, a promising combinatorial method for the morphological regulation of all‐polymer systems is demonstrated that contributes to enhanced efficiency.
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