In this work, a temperature-dependent aggregative polymer (PBDT-DTBTO) has been successfully explored to realize efficient thick film organic solar cells (OSCs). PBDT-DTBTO possesses a deep HOMO energy level of -5.35 eV and a wide bandgap of 1.76 eV, which is complementary to the near-infrared absorption of the paired non-fullerene acceptor, INPIC-4F. We reveal the efficacy of the temperature-dependent aggregative PBDT-DTBTO/INPIC-4F bulk-heterojunction (BHJ) blend for thick film OSCs through tuning the processing solvent and thermal annealing temperature. The results show that the device using chlorobenzene as the processing solvent only yields a mediocre power conversion efficiency (PCE) of 8.69%. Whereas, a superior PCE of 13.1% can be achieved by using chloroform (CF) as the processing solvent and proper thermal annealing. The morphological analysis shows that the bicontinuous network of the PBDT-DTBTO/INPIC-4F BHJ blend possesses a preferential face-on orientation when using CF as the processing solvent and thermal annealing, resulting in suppressed charge recombination and superior charge transport in the derived device. Moreover, the PBDT-DTBTO/INPIC-4F-based OSC demonstrates a high thickness toleration of the BHJ layer, which can still deliver a high PCE of 12.6% while the thickness of the BHJ layer is increased to ∼320 nm. More encouragingly, a promising PCE of over 12% can also be achieved for the device fabricated by blade-coating, revealing its great potential for the high-throughput solution-coating process.

在这项工作中，已经成功地探索了一种与温度有关的聚集聚合物（PBDT-DTBTO），以实现有效的厚膜有机太阳能电池（OSC）。PBDT-DTBTO具有-5.35 eV的深HOMO能级和1.76 eV的宽带隙，与配对的非富勒烯受体INPIC-4F的近红外吸收互补。通过调节加工溶剂和热退火温度，我们揭示了温度依赖性聚合PBDT-DTBTO / INPIC-4F本体-异质结（BHJ）混合物对厚膜OSC的功效。结果表明，使用氯苯作为加工溶剂的设备仅产生8.69％的中等功率转换效率（PCE）。而通过使用氯仿（CF）作为加工溶剂并进行适当的热退火可以实现13.1％的优异PCE。形态分析表明，当使用CF作为加工溶剂和热退火时，PBDT-DTBTO / INPIC-4F BHJ共混物的双连续网络具有优先的面朝取向，从而在衍生设备中抑制了电荷重组并实现了出色的电荷传输。此外，基于PBDT-DTBTO / INPIC-4F的OSC展示了BHJ层的高厚度公差，当BHJ层的厚度增加到约320 nm时，仍可提供12.6％的高PCE。更令人鼓舞的是，通过刮涂工艺制造的器件也可以实现超过12％的有希望的PCE，从而显示出其在高通量溶液涂布工艺中的巨大潜力。