Polymer Halide Perovskites-Waveguides Integrated In Nanocellulose As A Wearable Amplifier-Photodetector System

Semiconductor organometallic halide (CH3NH3PbX3, X= Cl, Br, I) perovskites (MHP) have emerged as a very high promising material for optoelectronics. Their large absorption coefficients, high electronic mobilities, excellent quantum yield of emission at room temperature and tunable band-gap with the composition resulted in a new generation of photovoltaics and electronic devices. In this work, HPVK materials are successfully incorporated on a nanocellulose (NC) substrate with the intention to exploit the interesting properties of HPVK materials to construct wearable devices. In particular, a bilayer Poly(methyl methacrylate) / HPVK deposited on NC resulted in a suitable waveguide to demonstrate amplification of the spontaneous emission (ASE) with a threshold as low as 3 - 4 nJ. Moreover, when a photodetector system is integrated within the waveguide, the device provides a photocurrent useful to monitor the light/ ASE propagated/ generated along the structure. This approximation paves the road of new wearable systems with a broad range of applications.