Morphological Characterization of Polymer Blends: Impact of Side Chain Modification
Morphological Characterization of Polymer Blends: Impact of Side Chain Modification
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DOI：
10.1017/s1431927620021388
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发表时间：
2020-08
影响因子：
2.8
通讯作者：
Washat Ware;Antony Devita;Tia Wright;Shubo Han;B. Gautam
中科院分区：
文献类型：
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作者：
Washat Ware;Antony Devita;Tia Wright;Shubo Han;B. Gautam
共轭聚合物和小分子由于其独特的电子和光学性质而受到广泛的研究。相对容易和廉价的制造，重量轻，机械灵活性和无毒的加工方法为其在太阳能电池中的应用开辟了广阔的前景[1，2]。在这些太阳能电池中已经实现了约16%的功率转换效率[3]。研究工作的重要焦点涉及开发新材料或改进处理系统以提高功率转换效率（PCE）[4，5]。目前，仍然存在一个问题，即基于非卤化溶剂（称为"绿色溶剂"[6]）的加工是否可能在工业规模上进行。由于使用有机溶剂，这些有机电子产品的可持续制造仍然造成严重的健康问题和有害的环境影响。在这里，我们研究了"绿色溶剂"处理的聚合物共混物的形态，并与用"卤化溶剂"处理的共混物进行比较，以探索基于脂肪族侧链和低聚乙二醇（OEG）侧链的聚合物太阳能电池中电荷产生效率差异的原因[7]。当PCBO12与仅具有微小侧链改性的聚合物（即PPDT2FBT-A [9]）的OEG版本共混时，具有9.2%功率转换效率的高效PPDT2FBT：PCBM [8]系统的性能显著降低至1.4%。我们采用原子力显微镜研究了侧链对这些聚合物共混物形态的影响。
Conjugated polymers and small molecules have been intensively studied due to their unique electronic and optical properties. Relatively easy and inexpensive fabrication, light weight, mechanical flexibility and non-toxic processing methods open broad prospects for their applications in solar cells[1, 2]. Power conversion efficiency of about 16% [3] has been achieved in these solar cells. Significant focus of research efforts involve develop new materials or to advance processing systems to increase the power conversion efficiency (PCE)[4, 5]. Currently, there remains a question whether the processing based on the nonhalogenated solvents, called “green solvents”[6], is possible on an industrial-scale. The sustainable manufacturing of these organic electronics, because of the organic solvents used, still pose serious health problems and a harmful environmental impact. Here, we studied the morphology of the “green solvents” processed polymer blend and compared with the blend processed with “halogenated solvent” to explore the reasons for the difference in charge generation efficiency in polymer solar cells based on aliphatic side chain and oligoethylene glycol (OEG) side chain[7]. The performance of the highly efficient PPDT2FBT:PCBM [8]system with 9.2% power conversion efficiency is degraded significantly to 1.4% when PCBO12 is blended with a OEG version of a polymer namely PPDT2FBT-A[9], that has only a minor side-chain modification. We employed Atomic Force Microscopy to investigate the impact of side chain on morphology of these polymer blends.