Heavy Mediator at Quantum Dot/Graphene Heterojunction for Efficient Charge Carrier Transfer to Enhance the Performance of the Optoelectronic Devices

The two-dimensional mediator with heavy effective mass possesses a large density of states that can be inserted at the two-dimensional heterostructure interface. In general, the 2D heterostructure interfaces suffer from enhanced depletion region which deteriorates the charge carrier transfer efficiency and hence the device performance. The insertion of the mediator reduces the depletion region and form type–II band alignment which speeds up the carrier dissociation efficiency and hence eventually enhances the carrier transfer phenomena.
2D ReS₂ as a mediator has been employed at the heterojunction of graphene and perovskite quantum dots which results in enhancing photosensitivity (> 10⁷ A/W). Moreover, the device can withstand 100% longitudinal strain making it ideal for the future wearable optoelectronic device industry¹.
Reference:
¹Ghosh, R., et al. (2019). "Heavy Mediator at Quantum Dot/Graphene Heterojunction for Efficient Charge Carrier Transfer: Alternative Approach for High-Performance Optoelectronic Devices." ACS Applied Materials & Interfaces 11(29): 26518-26527.