Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry , Beihang University , No. 37 Xueyuan Road , Haidian District, Beijing 100191 , P. R. China.
Institute of Chemistry , Academia Sinica , No. 128, Section 2, Academia Road , Nangang District, Taipei City 115 , Taiwan.
ACS Appl Mater Interfaces. 2018 Nov 21;10(46):39448-39454. doi: 10.1021/acsami.8b15746. Epub 2018 Nov 6.
Solution processes have been widely used for making polymer films in organic photoelectric devices but suffer from difficulties in controlling the film formation. Here, by in situ characterization triphase contact lines (TCLs) in a brush-coating process, we clarify how TCLs affect the quality of as-prepared films. By fine-tuning the dewetting of a binary polymer solution (P3HT:PCBM) via different directions, TCLs with different patterns lead to films with different morphologies. High-quality nanothin films with larger crystallized sizes and higher orientations were enabled when TCLs were parallel to the brush edge, based on which the polymer solar cell shows higher power conversion efficiency (2.665%) compared with that of the spin-coated film.
溶液处理在有机光电设备的聚合物薄膜制备中得到了广泛的应用，但在控制薄膜形成方面存在困难。在这里，我们通过在刷涂过程中对三相接触线（TCL）进行原位表征，阐明了 TCL 如何影响所制备薄膜的质量。通过精细调节二元聚合物溶液（P3HT：PCBM）的去湿，不同模式的 TCL 导致了具有不同形态的薄膜。当 TCL 与刷边平行时，形成了具有更大结晶尺寸和更高取向的高质量纳米薄膜，基于此，聚合物太阳能电池显示出比旋涂薄膜更高的功率转换效率（2.665%）。
