Single‐Walled Carbon Nanotube Thin Film for Flexible and Highly Responsive Perovskite Photodetector

Abstract

Metal–halide perovskites have recently shown tremendous progress in flexible photodetector applications owing to their great optical and electronic properties. However, apart from charge generating material, the high performance device requires a reasonable choice of electrodes for efficient carrier management as well. For example, the widespread use of gold and silver electrodes often results in perovskite device degradation while being expensive. Here, low‐cost and chemically inert single‐walled carbon nanotube (SWCNT) thin films are employed as electrodes to create highly responsive and flexible photodetector based on cesium lead tribromide (CsPbBr3) microcrystals. Direct growth of the perovskite on SWCNT forms excellent contact between the components leading to the state‐of‐the‐art responsivity for flexible perovskite photodetectors 1321 A W−1 at 5 V and under illumination intensity 1 mW cm−2 at 505 nm wavelength. The advanced properties of SWCNT films realized on a flexible substrate allow for robust operation over 104 cycles of device bending along with all parameters stability at ambient conditions for at least 1.5 months. The proposed design reveals the potential of SWCNT thin film electrodes for high performance perovskite flexible devices.

Phase‐Transition‐Cycle‐Induced Recrystallization of FAPbI3 Film in An Open Environment Toward Excellent Photodetectors with High Reproducibility

“…Perovskites have been widely employed in optoelectronic fields due to their strong light absorption and high carrier mobility. [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 ] With the realization of high‐performance perovskite devices in the laboratory, commercial applications are also highly desired. Commercial perovskite devices demand a production line with mature techniques and a high reproduction rate to satisfy the modern industry.…”

Improving Photoelectric Conversion with Broadband Perovskite Metasurface

“…(iv) The response time is shorter than 5.1 μs at three different wavelengths, which corresponds to a 3 dB bandwidth higher than 0.26 MHz. Such response time is shorter than those of the detectors − in Table . The rapid response of the device at different wavelengths demonstrates its potential for high-speed detection in the ultraviolet and visible spectra and broadband optical communications.…”

“…(iii) The corresponding responsivity is higher than those of the plasmonic metasurface photodetectors, 35,36 although lower than those of highly sensitive single-crystal bromide-based perovskite photodetectors. Moreover, compared with these photodetectors with high responsivity based on perovskite thin films, 5,37 the photodetector based on perovskite metasurface in @365 nm@1 V 12.61 × 10 3 ∼0.1/0.6 41 2 mW/cm 2 @565 nm@1 V 3.98 × 10 3 2 mW/cm 2 @850 nm@1 V 80 SnSe 2 /SnO 2 quantum dots on nanoflakes ∼49 nm ∼250−800 14.6 μW/cm 2 @365 nm@2 V 4.79 × 10 −2 0.5 42 23.8 μW/cm 2 @554 nm@2 V 1.68 × 10 −2 0.5 27.63 μW/cm 2 @780 nm@2 V 6.51 our work has a long distance between the gold electrodes due to the existence of metasurface, which affects the transmission of photoinduced carriers, resulting in reduced responsivity. This effect has also been reported previously in polarization detectors based on perovskite metasurfaces.…”

Multifunctional and Transformative Metaphotonics with Emerging Materials

“…Halide perovskites is a rapidly developing class of semiconductors, which can be synthesized both by wet-chemistry approaches and by various physical deposition methods. They have been intensively studied due to their outstanding electronic and optical properties, which are extremely prospective for solar photovoltaics, − light-emitting devices, − photodetectors, − X-ray detectors, as well as for data storage and memristors. , …”