高等学校化学学报 ›› 2023, Vol. 44 ›› Issue (9): 20230162.doi: 10.7503/cjcu20230162

• 研究论文 • 上一篇    下一篇

添加剂和溶剂退火协同优化制备高性能厚膜有机太阳能电池

杨航1, 凡晨岭1, 崔乃哲1, 李肖肖1, 张雯婧1, 崔超华1,2()   

  1. 1.苏州大学先进光电材料重点实验室, 苏州市新型半导体光电材料与器件重点实验室,材料与化学化工学部
    2.江苏省先进负碳技术重点实验室, 苏州 215123
  • 收稿日期:2023-04-01 出版日期:2023-09-10 发布日期:2023-05-17
  • 通讯作者: 崔超华 E-mail:cuichaohua@suda.edu.cn
  • 基金资助:
    国家自然科学基金(22022509);江苏省高校自然科学研究项目(21KJA150006)

Cooperative Effect of Solvent Additive and Solvent Vapor Annealing on High-performance Thick-film Organic Solar Cells

YANG Hang1, FAN Chenling1, CUI Naizhe1, LI Xiaoxiao1, ZHANG Wenjing1, CUI Chaohua1,2()   

  1. 1.Key Laboratory of Advanced Optoelectronic Materials,Suzhou Key Laboratory of Novel Semiconductor?optoelectronics Materials and Devices,College of Chemistry Chemical Engineering and Materials Science
    2.Jiangsu Key Laboratory of Advanced Negative Carbon Technologies,Soochow University,Suzhou 215123,China
  • Received:2023-04-01 Online:2023-09-10 Published:2023-05-17
  • Contact: CUI Chaohua E-mail:cuichaohua@suda.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(22022509);the Natural Science Foundation of the Jiangsu Higher Education Institutions of China(21KJA150006)

摘要:

通过溶剂添加剂1-氯萘(CN)和二硫化碳(CS2)溶剂退火(SVA)协同优化了基于窄带隙小分子受体的厚膜活性层形貌, 揭示了该策略对共混膜形貌的调控机理, 研究了其对活性层中的载流子动力学以及器件光伏性能的影响. 结果表明, CN添加剂可以有效促进受体材料结晶聚集, CS2溶剂退火能够进一步提升活性层材料分子堆积的有序性, 同时优化给受体材料相分离尺寸, 降低共混膜表面的粗糙度, 实现了良好的纳米尺寸相分离形貌. 基于CN+SVA处理的PM6∶Y6厚膜(300 nm)器件的电荷传输和复合性质得到改善, 取得了15.23%的光电转换效率(PCE), 显著高于未经处理(PCE=11.75%)和仅用CN处理(PCE=13.48%)的光伏器件. 该策略具有良好的适用性, 将基于PTQ10∶m-BTP-PhC6器件的光伏性能从13.22%提升至16.92%.

关键词: 有机太阳能电池, 厚膜器件, 活性层形貌, 液体添加剂, 溶剂退火

Abstract:

The solvent additive 1-naphthalene(CN) and carbon disulfide(CS2) solvent vapor annealing(SVA) were cooperatively used to optimize the thick-film active layer morphology based on the narrow band-gap small acceptors. The regulation mechanism of this strategy on the blend film morphology was revealed, and the effect of the strategy on the carrier dynamics as well as the photovoltaic performance of the device was investigated. The results show that the additive CN can effectively promote the crystallization and aggregation of the acceptor materials, and CS2 solvent vapor annealing can further improve the molecular stacking properties of donor/acceptor materials, reduce the surface roughness of the blend film, and thus obtain good nano-scale phase separation morphology. Therefore, the charge transport and recombination properties of PM6∶Y6-based thick-film(300 nm) devices are effectively improved, thus obtaining the power conversion efficiency(PCE) of 15.23%, which is significantly higher than that of devices without additive treatment(PCE=11.75%) and CN-treated devices(PCE=13.48%). Moreover, this strategy can also be used to optimize the PTQ10∶m-BTP-PhC6-based blend film morphology, and improve the photovoltaic performance of the devices from 13.22% to 16.92%.

Key words: Organic solar cell, Thick-film device, Active layer morphology, Solvent additive, Solvent vapor annealing

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