| 초록 |
Quantum and dielectric confinement effects in the nanoscale semiconductors result in the prized size and shape dependent optical/electronic properties which are not available in traditional bulk semiconductors. The semiconductor nanocrystals (also referred to as quantum dots) can be synthesized by scalable wet-chemical synthetic methods. With the benefits of solution-based fabrication techniques, these colloidal quantum dots can be processed into arrays or solid films and integrated in optoelectronic devices to control the charge carriers and convert them into optical flux or vice versa. The key distinction and thus the main challenge is to control the direction, separation and recombination of electrons and holes while having both carriers physically and electronically accessible. Here, we have successfully synthesized and characterized colloidal nanorod heterostructures that consist of two heterojunctions and maintain the anisotropic shapes. Band offsets designed into the nanorods can facilitate both charge recombination and separation and the anisotropic shape enhances light outcoupling and collection, ultimately allowing one device to function as both high performance LEDs and photodetectors. These dual-functioning, all-solution-processed light-responsive LEDs open feasible routes to novel display applications, from touchless interactive screens to energy harvesting displays and massively parallel display-to-display data communication. |
