Department of Electrical Engineering, École de Technologie Supérieure, 1100 Notre-Dame Ouest, Montréal, Québec, H3C 1K3, Canada.
Sci Rep. 2017 Mar 30;7:45543. doi: 10.1038/srep45543.
Organic-inorganic perovskites have already shown a tremendous potential for low-cost light-harvesting devices. Yet, the relatively low carrier mobilities in bulk perovskites still prevent large-area devices with performances competing with state-of-the-art technologies. Here, we tackle this fundamental challenge by incorporating single-wall carbon nanotubes within a perovskite matrix by means of a simple two-step method in ambient air. Using this nano-engineered hybrid film, we demonstrate large-area photodetectors with responsivities up-to 13.8 A.W and a broad spectral response from 300 to 800 nm, indicating that photocurrent generation arises from the charge transfer from the perovskite matrix to the embedded nanotube network. As the nanotubes facilitate the carrier extraction, these photodetectors also show a fast response time of 10 ms. This is significantly faster than most of previous reports on perovskite-based photodetectors, including devices with much smaller photosensitive areas. This approach is also well-suited for large-scale production of other perovskite-based light-harvesting devices.
有机-无机钙钛矿在低成本光收集器件方面已经显示出巨大的潜力。然而，体相钙钛矿中相对较低的载流子迁移率仍然阻止了大面积器件的性能与最先进技术相媲美。在这里，我们通过在环境空气中使用简单的两步法，在钙钛矿基体中加入单壁碳纳米管，从而解决了这一基本挑战。利用这种纳米工程杂化薄膜，我们展示了大面积光探测器，其响应率高达 13.8 A.W，光谱响应范围从 300 到 800nm，表明光电流的产生源于从钙钛矿基体到嵌入的纳米管网络的电荷转移。由于纳米管促进了载流子的提取，这些光探测器还表现出 10ms 的快速响应时间。这明显快于大多数之前关于基于钙钛矿的光探测器的报告，包括那些具有小得多的光敏面积的器件。这种方法也非常适合于其他基于钙钛矿的光收集器件的大规模生产。
