Ultrahigh Carrier Mobility Achieved in Photoresponsive Hybrid Perovskite Films via Coupling with Single-Walled Carbon Nanotubes
Ultrahigh Carrier Mobility Achieved in Photoresponsive Hybrid Perovskite Films via Coupling with Single-Walled Carbon Nanotubes
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DOI：
10.1002/adma.201602432
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发表时间：
2017-04-25
影响因子：
29.4
通讯作者：
Wu, Tom
中科院分区：
文献类型：
--
作者：
Li, Feng;Wang, Hong;Wu, Tom
有机铅三卤化物钙钛矿由于其优异的物理性能和低的加工成本而在光伏和光电应用中引起了极大的兴趣。然而，钙钛矿薄膜由于其结构缺陷如晶界和针孔而具有低载流子迁移率，限制了其器件性能和应用潜力。在这里，我们展示了一种简单而直接的合成策略，该策略基于将钙钛矿薄膜与嵌入的单壁碳纳米管耦合。我们能够显著提高钙钛矿薄膜的空穴和电子迁移率，分别达到595.3和108.7 cm（2）V-1 s（-1）的创纪录高值。这种协同效应可以用来构建双极光电晶体管，其光电探测率为3.7 x 10（14）Jones，响应率为1 x 10（4）A W-1，与迄今为止最好的器件相当。钙钛矿/碳纳米管混合物应该提供一个平台，这是非常理想的领域，如光电子学，太阳能转换和分子传感。
Organolead trihalide perovskites have drawn substantial interest for photovoltaic and optoelectronic applications due to their remarkable physical properties and low processing cost. However, perovskite thin films suffer from low carrier mobility as a result of their structural imperfections such as grain boundaries and pinholes, limiting their device performance and application potential. Here we demonstrate a simple and straightforward synthetic strategy based on coupling perovskite films with embedded single-walled carbon nanotubes. We are able to significantly enhance the hole and electron mobilities of the perovskite film to record-high values of 595.3 and 108.7 cm(2) V-1 s(-1), respectively. Such a synergistic effect can be harnessed to construct ambipolar phototransistors with an ultrahigh detectivity of 3.7 x 10(14) Jones and a responsivity of 1 x 10(4) A W-1, on a par with the best devices available to date. The perovskite/carbon nanotube hybrids should provide a platform that is highly desirable for fields as diverse as optoelectronics, solar energy conversion, and molecular sensing.