Biswas Chandan, Candan Idris, Alaskar Yazeed, Qasem Hussam, Zhang Wei, Stieg Adam Z, Xie Ya-Hong, Wang Kang L
Department of Electrical Engineering, Center of Excellence for Green Nanotechnologies, University of California, Los Angeles, CA, 90095, USA.
Center for Integrated Nanostructure Physics (CINAP), Institute for Basic Science (IBS), Sungkyunkwan University, Suwon, 16419, Republic of Korea.
Sci Rep. 2018 Jul 6;8(1):10259. doi: 10.1038/s41598-018-28658-6.
A traditional transparent conducting film (TCF) such as indium tin oxide (ITO) exhibits poor mechanical flexibility and inconsistent transmittance throughout the UV-VIS-NIR spectrum. Recent TCFs like graphene films exhibit high sheet resistance (R) due to defect induced carrier scattering. Here we show a unique hybrid chemical doping method that results in high transmittance uniformity in a layered graphene-polymer nanocomposite with suppressed defect-induced carrier scattering. This layer-by-layer hybrid chemical doping results in low R (15 Ω/sq at >90% transmittance) and 3.6% transmittance uniformity (300-1000 nm) compared with graphene (17%), polymer (8%) and ITO (46%) films. The weak localization effect in our nanocomposite was reduced to 0.5%, compared with pristine (4.25%) and doped graphene films (1.2%). Furthermore, negligible R change (1.2 times compared to 12.6 × 10 times in ITO) and nearly unaltered transmittance spectra were observed up to 24 GPa of applied stress highlighting mechanical flexibility of the nanocomposite film.
诸如氧化铟锡（ITO）之类的传统透明导电薄膜（TCF）表现出较差的机械柔韧性，并且在整个紫外-可见-近红外光谱范围内的透光率不一致。像石墨烯薄膜这样的新型TCF由于缺陷诱导的载流子散射而具有较高的薄层电阻（R）。在此，我们展示了一种独特的混合化学掺杂方法，该方法在具有抑制缺陷诱导载流子散射的层状石墨烯-聚合物纳米复合材料中实现了高透光率均匀性。这种逐层混合化学掺杂导致低电阻（在透光率>90%时为15Ω/sq）以及3.6%的透光率均匀性（300-1000nm），相比之下，石墨烯薄膜为17%，聚合物薄膜为8%，ITO薄膜为46%。与原始石墨烯薄膜（4.25%）和掺杂石墨烯薄膜（1.2%）相比，我们纳米复合材料中的弱局域化效应降低至0.5%。此外，在高达24GPa的外加应力下，观察到电阻变化可忽略不计（与ITO中12.6×10倍相比为1.2倍）且透光率光谱几乎未改变，突出了纳米复合薄膜的机械柔韧性。
