UV soaking for enhancing the photocurrent and response speed of Cs2AgBiBr6-based all-inorganic perovskite photodetectors

Abstract

The response speed of the reported Cs 2 AgBiBr 6based photodetectors exhibits a wide variation ranging from microseconds to nanoseconds, while the reason is still unclear. Apart from the conventional approaches such as reducing effective area, new regulating approaches for response speed improvement have rarely been reported. On the other hand, it is generally believed that ultraviolet (UV) light has negative impact on perovskite devices resulting in performance degradation. In this work, we demonstrated that the response speed of the photodetector with FTO/Cs 2 AgBiBr 6 /Au structure can be effectively regulated by utilizing UV light-soaking effect without reducing the device area. Particularly, the decay time is efficiently modulated from 30.1 µs to 340 ns. In addition, the −3 dB bandwidth of the device is extended from 5 to 20 kHz. It is worth mentioning that the light current is remarkably boosted by 15 times instead of any attenuation. Furthermore, we prove the universality of UV soaking treatment on Cs 2 AgBiBr 6 -based photodetectors with other all-inorganic structures, i.e., FTO/TiO 2 /Cs 2 AgBiBr 6 /Au, FTO/ Cs 2 AgBiBr 6 /TiO 2 /Au and FTO/TiO 2 /Cs 2 AgBiBr 6 /CuSCN/Au. Our results demonstrate a new method to improve the response speed and light current of Cs 2 AgBiBr 6 -based perovskite all-inorganic photodetectors.

Blade-coating of a highly crystallized lead-free silver-bismuth halide double perovskite thin film with improved stability for high-performance photodetection

“…Moreover, Table 1 presents a comparison of the device performances of various photodetectors based on Cs 2 AgBiBr 6 thin films. Compared with previously reported results, 11,14,17,62–66 photodetectors based on the Cs 2 AgBiBr 6 thin films with larger grain sizes exhibited significant improvement owing to suppressed non-radiative recombination. 15…”

“…Moreover, Table 1 presents a comparison of the device performances of various photodetectors based on Cs 2 AgBiBr 6 thin films. Compared with previously reported results, 11,14,17,[62][63][64][65][66] photodetectors based on the Cs 2 AgBiBr 6 thin films with larger grain sizes exhibited significant improvement owing to suppressed non-radiative recombination. 15 Wavelength-dependent I-V curves of the Cs 2 AgBiBr 6 thinfilm photodetector under a light intensity of 7.1 mW cm À2 at wavelengths ranging from 365 to 740 nm are shown in Fig.…”

Curved Photodetectors Based on Perovskite Microwire Arrays via In Situ Conformal Nanoimprinting

“…[5][6][7][8][9][10] In the medical field, the implantation of curved optoelectronic devices on complex surfaces of the skin or artificial organs is important for biological information compared with those of conventional materials. [37][38][39][40][41][42][43][44] For example, Zhang et al fabricated top-down etched microdisks and high-performance micro-lasers based on the CH 3 NH 3 PbBr 3 (MAPbBr 3 ) perovskite. [45] However, many technical challenges remain in fabricating perovskite-based micro/nano photodetectors (PDs) directly on curved substrates for curved-surface image sensors.…”

“…Perovskite materials play an important role in the development of micro/nanodevices because of their superior photoelectric properties compared with those of conventional materials. [ 37–44 ] For example, Zhang et al. fabricated top‐down etched microdisks and high‐performance micro‐lasers based on the CH 3 NH 3 PbBr 3 (MAPbBr 3 ) perovskite.…”

Self-powered photodetectors based on CsPbBr3 quantum dots/organic semiconductors/SnO2 heterojunction for weak light detection

“…In addition, most PDs need the application of a bias voltage for sensing, which limited the miniaturization of portable imager's applications [7,[27][28][29]. Thus, self-powered PDs, without the need for bias voltage during sensing, have attracted extensive research attention [30][31][32][33].…”