Flexible and Semitransparent Organolead Triiodide Perovskite Network Photodetector Arrays with High Stability

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• 作者：Hui Deng ; Xiaokun Yang ; Dongdong Dong ; Bing Li ; Dun Yang ; Shengjie Yuan ; Keke Qiao ; Yi-Bing Cheng ; Jiang Tang ; Haisheng Song
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：December 9, 2015
• 年：2015
• 卷：15
• 期：12
• 页码：7963-7969
• 全文大小：534K
• ISSN：1530-6992

文摘

Organolead triiodide perovskite (CH₃NH₃PbI₃) as a light-sensitive material has attracted extensive attention in optoelectronics. The reported perovskite photodetectors (PDs) mainly focus on the individual, which limits their spatial imaging applications. Uniform perovskite networks combining transparency and device performance were synthesized on poly(ethylene terephthalate) (PET) by controlling perovskite crystallization. Photodetector arrays based on above network were fabricated to demonstrate the potential for image mapping. The trade-off between the PD performance and transparency was systematically investigated and the optimal device was obtained from 30 wt % precursor concentration. The switching ratio, normalized detectivity, and equivalent dark current derived shot noise as the critical parameters of PD arrays reached 300, 1.02 脳 10¹² Jones, and 4.73 脳 10^鈥?5A Hz^鈥?/2, respectively. Furthermore, the PD arrays could clearly detect spatial light intensity distribution, thus demonstrating its preliminary imaging function. The perovskite network PD arrays fabricated on PET substrates could also conduct superior flexibility under wide angle and large number of bending. For the common problem of perovskite optoelectronics in stability, the perovskite networks sheathed with hydrophobic polymers greatly enhanced the device stability due to the improved interface contacts, surface passivation, and moisture isolation. Taking into consideration transparency, flexibility, imaging and stability, the present PD arrays were expected to be widely applied in visualized portable optoelectronic system.