Facilitation Centre for Industrial Plasma Technologies (FCIPT), Institute for Plasma Research (IPR), Gandhinagar, Gujarat, India382016.
Nanoscale. 2019 Jan 17;11(3):1217-1227. doi: 10.1039/c8nr08959k.
In this study, we have demonstrated the fabrication of one of the few lead-free perovskite photodetectors reported to date. In particular, we fabricated the photodetector based on a methylammonium bismuth iodide, MA3Bi2I9 (MABI), structure that works under a self-powered mode of operation. The optoelectronic properties of the photodetector were investigated systematically. The photoresponse of the photodetector was carefully studied and compared with the literature, which demonstrated the capability of the MABI structure for detecting light at a very low incident irradiance of 10 μW cm-2. Also, it exhibited a fast and reproducible response speed along with high photosensitivity (∼105) and detectivity (∼1012 Jones) at low operating voltages (0 V and 0.8 V) through the large effective device area. It was also revealed that the MABI photodetector had good stability after storage for two months at ambient conditions. It is therefore concluded that our photodetector fabricated with a MABI perovskite structure using a simple geometry has great potential to further improve the optoelectronic properties when proper electron/hole-transporting layers are fused for proper charge extraction. This will have significant benefits for next-generation cost-competitive optoelectronic technology to address the scalability issue.
在本研究中，我们成功制备了目前为止为数不多的无铅钙钛矿光探测器之一。具体而言，我们基于 MA3Bi2I9（MABI）结构制备了自供电模式工作的光探测器。系统地研究了光探测器的光电性能。仔细研究了光探测器的光响应，并与文献进行了比较，结果表明 MABI 结构能够以非常低的入射光辐照度（10 μW cm-2）检测光。此外，通过大有效器件面积，在低工作电压（0 V 和 0.8 V）下，它表现出快速且可重复的响应速度以及高光灵敏度（∼105）和探测率（∼1012 琼斯）。还揭示了在环境条件下储存两个月后，MABI 光探测器具有良好的稳定性。因此，可以得出结论，我们使用简单几何形状制备的具有 MABI 钙钛矿结构的光探测器具有很大的潜力，通过融合适当的电子/空穴传输层来进行适当的电荷提取，从而进一步改善光电性能。这将对下一代具有成本竞争力的光电技术解决可扩展性问题产生重大影响。
