A flexible solar-blind 2D boron nitride nanopaper-based photodetector with high thermal resistance

Abstract

Flexible electronics are expected to play a key role in connecting human lives with versatile smart electronic devices due to their adaptability to different shapes, surfaces, and even the human body. However, heat management issues found in most flexible devices due to the low thermal conductivity of conventional plastic or paper substrates become significant for large-scale integration or high-temperature applications. In this study, we employed high thermal conductivity nanopaper composed of twodimensional (2D) hexagonal boron nitride nanosheets and one-dimensional nanofibrillated cellulose to form a flexible deepultraviolet photodetector demonstrating superior photodetectivity of up to 8.05 × 10 10 cm Hz 1/2 /W, a short response time of 0.267 s, and excellent flexible durability featuring repeatable ON/OFF photoswitching over 200 bending cycles. Because the boron nitride paper has a high thermal conductivity of 146 W/mK, which is three orders of magnitude larger than plastic or paper substrates, the photodetectors can work at high temperatures of up to 200°C. The boron nitride paper-based strategy described herein suggests a path for improving heat dissipation in flexible electronics and achieving high-performance deep-ultraviolet photodetectors, which can be applied in wearable applications.

Orthogonal Lithography for Halide Perovskite Optoelectronic Nanodevices

“…Because the background dark current is greatly reduced by the functional organic group, the 2D perovskite photodetector in this study can reach a high detectivity of 1.07 × 10 13 cm Hz 1/2 /W, calculated using D* = R/(2eJ d ) 1/2 , where e is the electron charge and J d is the dark current density. 55 This detectivity value is much higher than that of 2D perovskite nanophotodetectors using other fabrication methods (detectivities: (4 to 8) × 10 11 cm Hz 1/2 /W) 53 and even comparable to 3D perovskite-based photodetectors (detectivities: 10 12 to 1.37 × 10 13 cm Hz 1/2 /W). 56−59 In summary, the high performance of our 2D perovskite photodetector in terms of responsivity and detectivity demonstrates the practicality, reliability, and reproducibility of the orthogonal lithography and the robustness of the perovskite during the orthogonal EBL process, enabling large-scale, high-density, and highthroughput fabrication of perovskite-based electronics.…”

High-speed colour-converting photodetector with all-inorganic CsPbBr3 perovskite nanocrystals for ultraviolet light communication

“…However, it suffers from a high power consumption, a bulky form factor, and a high cost 10 . In contrast, compact and small-footprint group-III-nitride-based PDs 11 , e.g., AlGaN- 12 , AlN- 13 , and BN 14 -based PDs, suffer from costly materials and substrate development. The existence of defect states and crystal dislocations related to high dark current complicates the design process and delays the further deployment of these PDs in UV-based communication systems.…”

Simultaneous production and functionalization of hexagonal boron nitride nanosheets by solvent-free mechanical exfoliation for superlubricant water-based lubricant additives

“…Recently, water-based lubricants have attracted increasing attention due to their outstanding properties, such as high fire resistance and excellent environmental friendliness. 6,7 As a result, it is becoming significant to explore and develop novel waterbased lubricants with good antifriction and antiwear performance.…”