分会

第二十九分会：有机/钙钛矿光伏材料与器件

摘要

将剪切冲量策略应用于大面积光伏模组制备，实现从小面积器件到环境友好型大面积有机光伏模组的转变。通过控制旋涂时间和刮涂速度提高印刷过程中溶液所受到的剪切冲量，系统研究旋涂工艺和刮涂工艺下溶液剪切冲量对薄膜形貌和器件性能的影响，建立剪切冲量、活性层形貌和器件性能之间的关系。在PM6:Y6体系中，当刮涂速度为55 mm/s时，活性层薄膜得到最优形貌，其光电转换效率达到了15.1%。增加剪切冲量可有效抑制绿色溶剂中给体和受体的过度聚集，有利于器件中激子分离与电荷传输。同时，通过计算不同制备工艺下的剪切冲量，并对其相应活性层形貌进行研究，我们归纳总结出了形成均质化有机活性层薄膜的临界条件。此外，为了对剪切冲量策略的普适性进行验证，我们制备了基于PM6:BTP-eC9体系的有机光伏器件。当器件有效面积为0.04 cm2时，其光电转换效率为17.15%；在大面积有机光伏器件中，有效面积为1 cm2的刚性和柔性器件光电转换效率分别为15.50%和13.26%，大面积模组(25 cm2)的光电转换效率达到11.29%。 The shear impulse strategy is applied to the preparation of large-area photovoltaic modules to realize the transformation from small-area devices to eco-friendly large-area organic photovoltaic modules. By controlling the spin-coating time and blade-coating speed to improve the shear impulse of the solution during the printing process, we systematically study the effects of the shear impulse of the solution on the films morphology and devices performance under the spin-coating process and blade-coating process, and establish the relationship between the shear impulse, active layer films morphology and devices performance. For the OSCs based on the PM6:Y6 system, the power conversion efficiency (PCE) reached 15.1% at the blade-coating speed of 55 mm/s due to the fine-tuning of the active layer films morphology. The enhancement of the shear impulse effectively inhibits the aggregation of donors and acceptors in green solvents, which facilitates exciton separation and charge translocation of devices. Meanwhile, by calculating the shear impulse under different preparation processes and investigating the corresponding active layer films morphology, we summarized the critical conditions for the formation of homogenized films. Furthermore, in order to verify the universality of the shear impulse strategy, we prepared PM6:BTP-eC9-based organic photovoltaic devices. The PCE reached 15.50% and 13.26% for the large-area (1 cm2) rigid and flexible devices, respectively, and 11.29% for the large-area module (25 cm2).

关键词

有机太阳电池;绿色印刷;剪切冲量策略;大面积模组

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