Dobryden Illia, Korolkov Vladimir V, Lemaur Vincent, Waldrip Matthew, Un Hio-Ieng, Simatos Dimitrios, Spalek Leszek J, Jurchescu Oana D, Olivier Yoann, Claesson Per M, Venkateshvaran Deepak
Division of Surface and Corrosion Science, Department of Chemistry, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, Drottning Kristinas väg 51, SE-100 44, Stockholm, Sweden.
Experimental Physics, Division of Materials Science, Department of Engineering Sciences and Mathematics, Luleå University of Technology, SE-971 87, Luleå, Sweden.
Nat Commun. 2022 Jun 2;13(1):3076. doi: 10.1038/s41467-022-30801-x.
The field of organic electronics has profited from the discovery of new conjugated semiconducting polymers that have molecular backbones which exhibit resilience to conformational fluctuations, accompanied by charge carrier mobilities that routinely cross the 1 cm/Vs benchmark. One such polymer is indacenodithiophene-co-benzothiadiazole. Previously understood to be lacking in microstructural order, we show here direct evidence of nanosized domains of high order in its thin films. We also demonstrate that its device-based high-performance electrical and thermoelectric properties are not intrinsic but undergo rapid stabilization following a burst of ambient air exposure. The polymer's nanomechanical properties equilibrate on longer timescales owing to an orthogonal mechanism; the gradual sweating-out of residual low molecular weight solvent molecules from its surface. We snapshot the quasistatic temporal evolution of the electrical, thermoelectric and nanomechanical properties of this prototypical organic semiconductor and investigate the subtleties which play on competing timescales. Our study documents the untold and often overlooked story of a polymer device's dynamic evolution toward stability.
有机电子领域受益于新型共轭半导体聚合物的发现，这些聚合物具有对构象波动具有弹性的分子主链，并伴随着通常超过1 cm/Vs基准的电荷载流子迁移率。一种这样的聚合物是茚并二噻吩并苯并噻二唑。以前认为其缺乏微观结构有序性，我们在此展示了其薄膜中纳米级高阶域的直接证据。我们还证明，其基于器件的高性能电学和热电性能并非固有，而是在暴露于环境空气后迅速稳定下来。由于一种正交机制，聚合物的纳米力学性能在更长的时间尺度上达到平衡；残留的低分子量溶剂分子从其表面逐渐渗出。我们捕捉了这种典型有机半导体的电学、热电和纳米力学性能的准静态时间演变，并研究了在相互竞争的时间尺度上起作用的微妙之处。我们的研究记录了聚合物器件向稳定性动态演变的不为人知且常常被忽视的故事。
