TiN Electrode for High Performance CsPbBr3 Perovskite Nanocrystal based Photodetectors

We would like to submit our manuscript entitled, “TiN Electrode for High Performance CsPbBr3 Perovskite Nanocrystal based Photodetector”, for publication in IEEE Sensors Journal. The work described in this manuscript has never been published before.

Some recent works have demonstrated that the ceramic compound of titanium nitride (TiN) can sever as a promising electrode material by virtue of high conductivity, strong hardness, good chemical stability and thermal stability, along with low cost. However, there has been rarely report addressing the effectiveness of TiN electrode in all-inorganic halide perovskites nanocrystals (INP NCs) based photodetectors (PDs). 

In this work, the effects of different metal electrodes including TiN, Ag, and Au, on the performance of CsPbBr3 NCs based PDs are compared systematically. Here, based on INP NCs synthesized through the supersaturated recrystallization method, a high-performance metal-semiconductor-metal (MSM) type PD with a photo-to-dark-current ratio above 104 and a dynamic range of 164 dB was demonstrated employing the low-cost TiN electrode. It indicates that the PD with TiN electrode maintains a dark current as low as that of PD with Au electrode; while that with Ag electrode is hundreds of times inferior. It also reflects that the photocurrent of the PD with TiN electrode is quite close to that of the Au electrode counterpart, which exhibits a 161 times improvement with respect to the PD with Ag electrode. Moreover, the TiN electrode PD demonstrates a much better stability relative to the device with Ag electrode. Our work contributes to developing low-cost, high-performance PDs based on solution-processed semiconductors.