Two-Pronged Effect of Warm Solution and Solvent-Vapor Annealing for Efficient and Stable All-Small-Molecule Organic Solar Cells,ACS Energy Letters

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Two-Pronged Effect of Warm Solution and Solvent-Vapor Annealing for Efficient and Stable All-Small-Molecule Organic Solar Cells
ACS Energy Letters ( IF 19.3 ) Pub Date : 2021-07-28 , DOI: 10.1021/acsenergylett.1c01289
Mengyun Jiang ₁ , Hai-rui Bai ₁ , Hong-fu Zhi ₁ , Jian-ke Sun ₁ , Jin-liang Wang ₁ , Fujun Zhang ₂ , Qiaoshi An ₁

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Herein, a portfolio strategy of warm solution and solvent-vapor annealing (WS+SVA) is employed to subtly manipulate the morphology of small molecular active layers. The WS will increase the molecular solubility and shorten the molecular organization time, and thereby restrain the molecular aggregation during the blend film formation, leading to homogeneous molecular distribution and imporous blend films. Based on the blend films with WS, the SVA treatment can further afford a driving force for tuning phase separation and molecular arrangement after the blend film formation. The WS+SVA-based all-small-molecule organic solar cells (ASM-OSCs) with B1:BTP-eC9 as active layer deliver a champion power conversion efficiency (PCE) of 15.68% with better stability, which is mainly attributable to the enhanced light absorption, charge generation, and extraction. Moreover, the 15.68% PCE should be among the highest values for binary ASM-OSCs. This work proves a promising method to remove the obstacle of morphological modulation for improving the performance of ASM-OSCs.

中文翻译：

温溶液和溶剂蒸汽退火的两管齐下的高效稳定全小分子有机太阳能电池

在此，采用温溶液和溶剂蒸汽退火 (WS+SVA) 的组合策略来巧妙地操纵小分子活性层的形态。WS会增加分子溶解度，缩短分子组织时间，从而抑制共混膜形成过程中的分子聚集，导致分子分布均匀，共混膜不透气。基于与WS的共混膜，SVA处理可以进一步提供在共混膜形成后调节相分离和分子排列的驱动力。以 B1:BTP-eC9 作为活性层的基于 WS+SVA 的全小分子有机太阳能电池 (ASM-OSCs) 提供了 15.68% 的功率转换效率 (PCE) 和更好的稳定性，这主要归因于增强光吸收，电荷产生，和提取。此外，15.68% 的 PCE 应该是二进制 ASM-OSC 的最高值之一。这项工作证明了一种消除形态调制障碍以提高 ASM-OSC 性能的有前途的方法。

更新日期：2021-08-13

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