Acta Chimica Sinica ›› 2022, Vol. 80 ›› Issue (5): 581-589.DOI: 10.6023/A21120622 Previous Articles     Next Articles



何新蕊a,b, 蔡丽娜a,b, 陈汉生b, 尹攀b, 尹志刚b,c,*(), 郑庆东b,*()   

  1. a 福州大学化学学院 福州 350108
    b 中国科学院福建物质结构研究所 结构化学国家重点实验室 福州 350002
    c 中国福建光电信息科学与技术创新实验室 福州 350108
  • 投稿日期:2021-12-31 发布日期:2022-05-31
  • 通讯作者: 尹志刚, 郑庆东
  • 作者简介:
  • 基金资助:
    福建省杰出青年科学基金(2019J06023); 国家自然科学基金(52130306); 国家自然科学基金(52173241); 中国福建光电信息科学与技术创新实验室(闽都创新实验室)主任基金(2021ZR116)

A Dual Post-Treatment Method for Improving the Performance of Ternary NiMgO Semiconductor Interfacial Layers and Their Organic Solar Cells

Xinrui Hea,b, Lina Caia,b, Hansheng Chenb, Pan Yinb, Zhigang Yinb,c(), Qingdong Zhengb()   

  1. a College of Chemistry, Fuzhou University, Fuzhou 350108
    b State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002
    c Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou 350108
  • Received:2021-12-31 Published:2022-05-31
  • Contact: Zhigang Yin, Qingdong Zheng
  • About author:
    Dedicated to the 10th anniversary of the Youth Innovation Promotion Association, CAS.
  • Supported by:
    Natural Science Foundation of Fujian Province for Distinguished Young Scholars(2019J06023); National Natural Science Foundation of China(52130306); National Natural Science Foundation of China(52173241); Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China(2021ZR116)

Organic solar cells (OSCs) are among the most promising photovoltaic technologies to solve energy and environmental problems. To achieve highly efficient OSCs, controlling over electrode interfacial layers is greatly important for improving charge transportation and collection. Here, ternary metal oxide semiconductor films of Mg-doped NiO (NiMgO) have been prepared via a sol-gel method, and further optimized by several post-treatment strategies. The structures, properties and energy levels of different NiMgO films have been investigated to explore the influence of various post-treatment strategies. Incorporating the ternary NiMgO films as a novel type of hole transport layers (HTLs), non-fullerene OSCs have been fabricated based on a promising bulk-heterojunction of PM6:M36. Their photovoltaic performances and mechanisms of device physics are also investigated. When the sol-gel derived NiMgO film without post-treatment is used as an HTL, the OSCs show a relatively low power conversion efficiency (PCE) of 5.90%. By contrast, after simple ultraviolet-ozone (UVO) post-treatment on the NiMgO HTL, the resulted OSCs exhibit greatly enhanced photovoltaic performances, with an increased open-circuit voltage (VOC) of 0.87 V and an improved PCE of 12.67%. More importantly, a new dual post-treatment combining surface rinse with UVO treatment has been demonstrated to further optimize NiMgO HTLs and improve device performances. The rinse process can remove excess impurities and flatten the surface of NiMgO films as well as increase the transmittance, while the UVO treatment process is beneficial for reducing surface defects of the ternary oxide films. Benefit-ing from such an efficient dual post-treatment on NiMgO HTLs, the OSCs afford a high PCE of 13.17% with a retained VOC of 0.87 V, an increased short-circuit current density of 23.48 mA•cm–2, and an improved fill factor of 64.29%. These results provide an effective way for surface post-treatment and property optimization of semiconducting metal oxide films, and contribute to the development of high-performance optoelectronic devices.

Key words: organic photovoltaic, ternary oxide, hole transport layer, surface treatment, interface engineering