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.