Interdigital Photodetector with stabilized α-phase CsPbI3 using polyethylene oxide

Abstract

Inorganic perovskite photodetector with chromium interdigitated electrodes is investigated. The active material is a solution processed CsPbI3 synthesized by one step deposition. The α-phase of this material is unstable at room temperature and it converts to the δ-phase at temperatures below 320°C. The stabilization of the α-phase was conducted in nitrogen environment by adding 5% weight ratio of polyethylene oxide to the equimolar mixture of PbI2 and CsI in dimethyl sulfoxide. The absorbance spectrum of the CsPbI3 with polyethylene oxide showed the emergence of a second peak at ∼ 690 nm related to the α-phase in addition to the peak at 420 nm of the δ phase. The peak in the visible range was also observed in the μ-photoluminescence spectrum at 690 nm. The interdigital structure was prepared by photolithography method to deposit 80 nm of chromium interdigitated electrodes on glass substrate with 10 μm channel width. The detector's on/off ratio and the detectivity were calculated from the current voltage curve under 100 mW/cm2 to be 9.64×103 and 9.2×109 Jones respectively.

Hybrid mixed-dimensional WTe2/CsPbI3 perovskite heterojunction for high-performance photodetectors

“…The time constant of rise and decay responses were calculated to be 0.98 s and 3.34 s, respectively. This response time is comparable to those of CsPbI 3 (0.8 s/0.96 s) [45], CsPbI 3 /C8BTBT (0.63 s/0.54 s) [46], CsPbI 3 /MoS 2 (0.59 s/0.32 s) [47], MAPbI 3 /SWCNT (3.6 s/16 s) [48], CsPbBr 3 /2D CdS x Se 1-x (0.53 s/0.62 s) [49]. The obtained results are still much longer than those of the intrinsic response time of the perovskite-based photodetectors [50].…”

CsPbBr3 perovskite photodetector with interdigital chromium electrodes

“…The photocurrent of the device at 5 voltage was 2.9×10 -6 while the dark current was 1.22×10 -8 showing approximately a difference of two orders of magnitude and 2.3×10 2 on/off ratio. The value of the band gap plays a significant role on the on/off ratio, since a material with lower band gap such as α-CsPbI 3 absorbs bigger portion of light and produce higher on/off ratio as our group previously showed [25]. These results were calculated under 100 mW cm −2 , which is a relatively high intensity that is close to the saturation level of the device.…”

An efficient low-cost and facile ITO interdigital micro-photodetector based on mixed cationic perovskites for screening new optoelectronic materials

“…Detailed information regarding the interdigital electrodes based on perovskites reported in previous reports is summarized in Table S2 (ESI †). [16][17][18][19][20][21][22][23][24][25][26] The R and D values of our ITO-IEs based on MCPs can reach up to those in the literature (Table S2, ESI †) for metal interdigital electrodes.…”