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【南昌大学&中科院理化所】利用外部磁场引入的抗磁力打印可扩展有机光伏Adv. Mater. (IF=26.8)

  • 2026-02-13 13:54:16
【南昌大学&中科院理化所】利用外部磁场引入的抗磁力打印可扩展有机光伏Adv. Mater. (IF=26.8)
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南昌大学化学化工院、物理与材料学院和中国科学院光化学转换与功能材料重点实验室研究团队在材料科学领域Top期刊Advanced Materials发表了题为“Utilization of Diamagnetic Force Introduced by External Magnetic Fields for Printing Scalable Organic Photovoltaics”的文章。

研究背景
01
研究问题

这篇文章要解决的问题是如何在大面积有机太阳能电池(OSCs)中实现高效的薄膜形态控制,以减少性能退化。

02
研究难点

该问题的研究难点在于随着设备面积的增加,活性层的微观形态、分子间相互作用和堆叠行为的影响被放大,导致小分子受体(SMAs)在打印过程中形成弱相互作用和无序的分子结构,进而影响薄膜均匀性和性能。

03
相关工作

现有的解决方案包括在活性层溶液中加入第三组分来调节成膜行为,以及采用非接触辅助工艺如磁场或电场来优化分子自组装过程。然而,这些方法在大面积OSCs制备中仍面临形态挑战,导致显著的效率损失。

研究方法

这篇论文提出了一种基于外部磁场辅助打印(MFA)的非接触和尺寸不敏感的策略,用于解决OSCs中大面积薄膜形态控制的问题。具体来说,

01
材料与溶液制备

使用PM6、D18、L8-BO、BTP-eC9和PNDIT-F3N等材料,分别溶解在o-XY溶剂中,并在不同温度下搅拌以获得均匀的溶液。

02
薄膜沉积

通过刮涂技术在ITO基板上沉积2PACz层,并在不同磁场强度下打印活性层。最后,在真空下沉积Ag电极

03
器件制备

将活性层部分激光划刻以隔离单个电池,然后在沉积Ag电极层后再次激光划刻以完成模块互连。

04
表征方法

使用Keithley 2400数字源表在模拟太阳光源AM1.5G下测量电流密度-电压(J-V)曲线,使用Enlitech QE-R3011系统记录EQE光谱,使用FastFLIM-Q2系统进行光致发光(PL)映射测量,使用Hioki LCR Meter进行电化学阻抗谱(EIS)测量等。

05
磁场辅助打印技术

开发了一种基于现有空气刮涂技术的磁场辅助打印技术,通过在薄膜形成过程中引入外部磁场来调节分子末端基团的化学环境,增强分子间相互作用,从而调控分子堆叠行为。

06
分子间相互作用的表征

使用固态核磁共振(ssNMR)、拉曼光谱(Raman)、掠射广角X射线散射(GI-WAXS)和设备物理分析对分子间相互作用、薄膜形成过程、活性层形态和设备性能进行了详细表征。

结果与分析
01
分子间相互作用

通过ssNMR分析发现,MFA处理后的L8-BO薄膜中芳香环的局部环境发生了变化,表明分子间相互作用增强。具体来说,MFA处理使得L8-BO薄膜中的π-π堆叠相互作用和烷基链的局部结构发生变化,导致分子间的相互作用和取向发生改变。这些变化通过2D异核相关谱和2D 1H-1H双量子-单量子相关谱得到了验证,显示出更强的分子间相互作用和更优的分子堆叠行为。

02
结晶度和薄膜应力

GI-WAXS分析显示,随着磁场强度的增加,L8-BO分子的(010)衍射峰变窄,π-π堆叠距离减小,晶体相干长度增加,表明MFA促进了分子间的紧密堆积。薄膜应力测试结果显示,MFA处理后的L8-BO薄膜在边缘附近的应力积累减少,最大应力值从1023.58 MPa降低到631.27 MPa,表明MFA处理显著提高了薄膜的均匀性和减少了应力集中。

03
薄膜形成动力学

光学显微镜观察和原位紫外-可见吸收光谱分析表明,MFA处理降低了溶剂挥发速度,延长了晶体生长时间,有利于形成均匀的受体相和更好的相分离形态。

04
垂直相分布和电荷动态

通过交叉扫描Kelvin探针显微镜(SKPM)和光致发光(PL)映射测量发现,MFA处理增强了D/A界面处的电荷传输,减少了陷阱辅助复合。

05
光伏性能和机械性能

MFA处理通过增强分子间相互作用和优化分子堆叠行为,改善了活性层的形态和相分离,从而提高了OSCs的光伏性能。具体来说,MFA处理降低了溶剂挥发速度,延长了晶体生长时间,有利于形成均匀的受体相和更好的相分离形态。此外,MFA处理还增强了D/A界面处的电荷传输,减少了陷阱辅助复合,提高了电荷收集效率。这些改进使得OSCs在0.04 cm2和1.00 cm2有效面积下的最大功率转换效率(PCE)分别为19.32%和18.28%,在大面积OSCs(25 cm2)上的最优PCE为16.70%。此外,MFA处理显著提高了设备的热稳定性和机械稳定性。

总体结论

这篇论文提出了一种基于外部磁场辅助打印的非化学和便捷的方法,用于在大面积OSCs中沉积高质量的活性薄膜。通过ssNMR和GIWAXS表征,发现MFA处理后的薄膜表现出更强的分子间相互作用和优化的电荷传输。在大面积OSCs中,MFA策略显示出良好的普适性,能够显著提高光伏性能和稳定性。该研究为有机电子器件的高效和稳定的大规模生产提供了有价值的参考。

参考文献

https://doi.org/10.1002/adma.202520583

END

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  1. CONNECT:[ UseTime:0.000644s ] mysql:host=127.0.0.1;port=3306;dbname=aa460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000705s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000278s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000242s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000507s ]
  6. SELECT * FROM `set` [ RunTime:0.000199s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000584s ]
  8. SELECT * FROM `article` WHERE `id` = 466765 LIMIT 1 [ RunTime:0.001583s ]
  9. UPDATE `article` SET `lasttime` = 1770996861 WHERE `id` = 466765 [ RunTime:0.002637s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000224s ]
  11. SELECT * FROM `article` WHERE `id` < 466765 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000407s ]
  12. SELECT * FROM `article` WHERE `id` > 466765 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000379s ]
  13. SELECT * FROM `article` WHERE `id` < 466765 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000742s ]
  14. SELECT * FROM `article` WHERE `id` < 466765 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002842s ]
  15. SELECT * FROM `article` WHERE `id` < 466765 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002171s ]
0.083975s