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1.上海大学 材料科学与工程学院, 上海 200072
2.上海大学机电工程与自动化学院 新型显示技术及应用集成教育部重点实验室, 上海 200072
[ "李维光(1997-),男,江苏连云港人,硕士研究生,2019年于常州大学获得学士学位,主要从事有机太阳能电池及有机电致发光器件方面的研究。" ]
[ "陈俊聪(1998-),男,福建福清人,硕士研究生,2020年于桂林电子科技大学获得学士学位,主要从事有机电致发光器件的研究。" ]
[ "郑燕琼(1979 -),女,湖北咸宁人,博士,副研究员,硕士生导师,2009年于华中科技大学获得博士学位,主要从事有机光电子材料与器件的研究。" ]
[ "李喜峰(1978-),男,山西大同人,博士,研究员,博士生导师,2006年于复旦大学获得博士学位,主要从事晶体管材料与器件的研究。 E-mail: lixifeng@shu.edu.cn" ]
收稿日期:2022-03-27,
修回日期:2022-04-08,
纸质出版日期:2022-06-05
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李维光,陈俊聪,郑燕琼等.低沸点溶剂处理PEDOT∶PSS薄膜提升光伏电池性能[J].发光学报,2022,43(06):922-933.
LI Wei-guang,CHEN Jun-cong,ZHENG Yan-qiong,et al.Low Boiling-point Solvents Treatment of PEDOT∶PSS Film for Optimized Photovoltaic Cell Performance[J].Chinese Journal of Luminescence,2022,43(06):922-933.
李维光,陈俊聪,郑燕琼等.低沸点溶剂处理PEDOT∶PSS薄膜提升光伏电池性能[J].发光学报,2022,43(06):922-933. DOI: 10.37188/CJL.20220108.
LI Wei-guang,CHEN Jun-cong,ZHENG Yan-qiong,et al.Low Boiling-point Solvents Treatment of PEDOT∶PSS Film for Optimized Photovoltaic Cell Performance[J].Chinese Journal of Luminescence,2022,43(06):922-933. DOI: 10.37188/CJL.20220108.
聚(3,4-乙烯二氧噻吩)∶聚(苯乙烯磺酸盐)(PEDOT∶PSS)作为热门空穴传输材料之一,被广泛应用于各种光电子器件中。为提高其导电性,高沸点溶剂常常被直接添加到PEDOT∶PSS溶液中,然而这同时会造成溶剂残留,给器件带来明显的漏电流。而在以往的报道中,并未见有效利用更易去除的低沸点溶剂。在本工作中,我们发现使用异丙醇、乙醇和丙酮三种低沸点溶剂对PEDOT∶PSS薄膜进行先滴加后旋涂处理后,相应的P3HT∶PC
61
BM聚合物太阳能电池(PSCs)性能得到了改善。尤其在异丙醇处理后,电池短路电流密度从8.15 mA/cm
2
提高到9.17 mA/cm
2
,能量转换效率达到3.5%,相比参比器件提升了18.6%,同时未引起器件的漏电流增加。分析后发现处理后的PEDOT∶PSS薄膜中PEDOT链和PSS链发生相分离,表面形貌发生改变,透光能力和导电性得到增强。同时,通过溶剂处理尤其异丙醇处理后,PEDOT∶PSS的空穴传输能力显著上升。这些结果表明,低沸点溶剂可以通过这种方法被有效地利用,从而改善PEDOT∶PSS薄膜的光电性能。
As a popular hole transport material, poly(3,4-ethylenedioxythiophene)∶poly(styrene sulfonate)(PEDOT∶PSS) has been widely used in variety of optoelectronic devices. High boiling-point solvents were usually added into PEDOT∶PSS solutions to enhance its conductivity, but simultaneously resulted in evident leakage current due to solvent residue. However, low boiling-point solvents, which are more easily removed, have not been effectively utilized. In this study, we found that the performance of the corresponding poly(3-hexy-thiophene)(P3HT)∶[6,6]-phenyl-C
61
-butyric acid methyl ester(PC
61
BM) polymer solar cells(PSCs) was improved without increasing the leakage current after low boiling-point solvent treatment of PEDOT∶PSS films by dripping isopropanol, ethanol or acetone then spin-coating. Especially, after the isopropanol treatment, the short-circuit current density of PSC increased from 8.15 mA/cm
2
to 9.17 mA/cm
2
, and the power conversion efficiency reached 3.5%, an 18.6% enhancement compared to the control device. The analysis revealed that the solvent-treated PEDOT∶PSS films demonstrated diffetent surface morphology, enhanced light transmission, and improved electrical conductivity due to the phase separation between PEDOT and PSS chains. Meanwhile, the hole transport capability of PEDOT∶PSS increased after treatment, especially after the isopropanol treatment. These results suggested that low boiling-point solvents could be effectively utilized by this method and improved the optoelectronic properties of the PEDOT∶PSS film.
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