Carbon quantum dots: organic–inorganic perovskite composites for optoelectronic applications

In this study, we focus on carbon quantum dots (CQDs) derived from L-Lysine using a microwave-assisted technique, which offers a rapid and straightforward route to generate CQDs smaller than 10 nm on average. We present a method for procuring dry CQDs powder, capable of dissolving in various solvents. To examine the influence of CQDs on the properties of organic–inorganic perovskite and the potential impact of DMA solvent on CQDs, we investigated the optical and electrical characteristics of both pure CQDs and CQDs combined with MAPbBr3 films within a temperature range from 89 to 293 K. Our findings reveal the presence of a positive temperature coefficient of resistivity in the temperature range of 90–290 K. Subsequently, we discuss the plausible mechanism responsible for charge carrier transport in these types of composites.