Facile fabrication of bismuth sulphide microflowers for a novel type of flexible paper laser detector

Highlights: • Printing paper based high performance flexible laser detector was fabricated successfully. • The photoelectric properties were studied upon 450 nm, 532 nm, 650 nm and 780 nm laser beam irradiation. • The flexible laser detector can measure the 3.3 mW/cm² weak laser signal of 450 nm. Development of the flexible electronics, especially electronic skin, put forward new requirements for flexible substrates and sensing materials. Herein, using printing paper substrate and Bi₂S₃ microflowers, the high performance flexible laser detector is successfully fabricated. The laser detector has a flexible and fast response to 450, 532, 650 and 780 nm laser beams of different intensity. The flexible laser detector is able to measure as weak laser signal as 3.3 mW/cm² at 450 nm. The mechanism of the photo response of laser detector based on Bi₂S₃ microflowers is discussed. Our work here opens up opportunities for the fabrication of flexible optoelectronic devices with quite high and stable spectral property.