高等学校化学学报 ›› 2023, Vol. 44 ›› Issue (7): 20230047.doi: 10.7503/cjcu20230047

• 研究论文 • 上一篇    下一篇

聚合物添加剂作为形貌调节剂提升全小分子有机太阳能电池的效率和稳定性

时宇1, 张榴1, 国霞2(), 王阳1, 肖海芹1, 房进1, 周祎1, 张茂杰1,2()   

  1. 1.苏州大学材料与化学化工学部, 苏州市新型半导体光电材料与器件重点实验室, 苏州 215123
    2.山东大学化学与化工学院,国家胶体材料工程技术研究中心, 济南 250100
  • 收稿日期:2023-02-06 出版日期:2023-07-10 发布日期:2023-04-07
  • 通讯作者: 国霞 E-mail:guoxia0610@sdu.edu.cn;mjzhang@sdu.edu.cn
  • 作者简介:张茂杰, 男, 博士, 教授, 主要从事有机光伏领域方面的研究. E-mail: mjzhang@sdu.edu.cn
  • 基金资助:
    国家自然科学基金(51973146);山东省自然科学基金会(ZR2022JQ09)

All-small-molecule Organic Solar Cells with Enhanced Efficiency and Stability Enabled by Polymer Additive as a Morphology Modulator

SHI Yu1, ZHANG Liu1, GUO Xia2(), WANG Yang1, XIAO Haiqin1, FANG Jin1, ZHOU Yi1, ZHANG Maojie1,2()   

  1. 1.Suzhou Key Laboratory of Novel Semiconductor?optoelectronics Materials and Devices,College of Chemistry,Chemical Engineering and Materials Science,Soochow University,Suzhou 215123,China
    2.National Engineering Research Center for Colloidal Materials,School of Chemistry & Chemical Engineering,Shandong University,Jinan 250100,China
  • Received:2023-02-06 Online:2023-07-10 Published:2023-04-07
  • Contact: GUO Xia E-mail:guoxia0610@sdu.edu.cn;mjzhang@sdu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(51973146);the Shandong Provincial Natural Science Foundation, China(ZR2022JQ09)

摘要:

活性层形貌的调控是实现全小分子有机太阳能电池高效率和稳定性的关键. 本文将聚合物给体PM7作为形貌调节剂加入到BTTzR∶Y6二元体系中, 制备了三元全小分子有机太阳能电池. 研究结果表明, 少量PM7的加入能够有效改善共混膜中的微观纳米结构和分子堆积, 促使器件获得更加有效的激子解离和载流子传输; 相应器件的短路电流和填充因子显著提升, 最终能量转化效率从二元器件的13.9%提高到三元器件的16.0%. 值得注意的是, 三元器件的热稳定性大幅提升, 在85 ℃加热2200 min后依然能够保持初始效率的79%; 而二元器件则大幅衰减到初始效率的43%. 以上结果表明, 添加聚合物添加剂可以有效地调节共混膜形貌, 以获得高效和稳定的全小分子有机太阳能电池.

关键词: 全小分子有机太阳能电池, 聚合物添加剂, 形貌调控, 高效率与稳定性

Abstract:

For all-small-molecule organic solar cells(ASM-OSCs), modulating the morphology of active layer has been a challenging and urgent issue to achieve high efficiency and stablity. In this work, a polymer donor PM7 as a morphology modulator was incorporated to a BTTzR∶Y6 system to fabricate ternary ASM-OSCs. A small amount of PM7 could promote more favourable nanostructure and ordered molecular packing in the blend film, resulting in more efficient excition dissiociation and charge carrier transport in the device. As a result, the optimal ternary devices exhibited a significantly improved power conversion efficiency(PCE) of 16.0% with simultaneously enhanced short circuit current(JSC) and fill factor(FF) compared to the binary devices with a PCE of 13.9%. Notably, after being heated at 85 ℃ for 2200 min, the ternary devices still retained 79% of its initial PCE, whereas the binary devices showed larger decay to 43% in the same duration. The results demonstrated that adding the polymer additive can effectively modulate the blend morphology for highly efficient and stable ASM-OSCs.

Key words: All-small-molecule organic solar cell, Polymer additive, Morphology modulator, High efficiency and stability

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