Semiconductor devices based on hybrid organic–inorganic perovskites (HIOPs) are growing in popularity due to their potential applications in efficient light-emitting diodes, solar cells, lasers, and more. These hybrid materials are soft and flexible, and are much easier to fabricate in the bulk than comparable semiconductors. As a result, thin films of HIOPs could even be used for future electronic devices that could be painted onto a surface.
Particular interest has focused on 2D metal halide HIOPs, since they have been shown to host high-energy excitons – typically hundreds of meV. Now, an international team led by researchers from the Georgia Institute of Technology, US, has made the surprising discovery that multiple excitons with distinct properties can coexist in these hybrid materials. This finding could open up a range of novel device applications, but also raises many questions about the mechanisms that give rise to this phenomenon.
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