Silicon solar cells are approaching their efficiency limit of 29% under the standard solar spectrum. In order to surpass this limit, a device is required that better manages the energy in each incoming energy packet (photon). One approach to this end is to split the energy of higher energy photons in two, such that two electron-hole pairs can be generated by one photon. This strategy has an upper limit of 45.9%. Organic Multiple Exciton Generation (OMEG) is executed by a photophysical process called singlet fission. A spin-0 (singlet) exciton is generated by a photon, and it decays into two spin-1 triplet excitons in a spin-conserving process. This talk will detail our progress towards developing OMEG augmented silicon solar cells (OMEGA-Si).
Spin is a quantum property fundamental to the charge-light conversion process in optoelectronic devices. Organic materials offer unique opportunities to exploit spin due to their long coherence and lifetimes. The hyperfine interaction, which dominates the spin-dependent recombination processes of these materials, can be chemically tuned on a molecular level while retaining the large-scale fabrication techniques of those materials. To date, this property has been treated monolithically, characterized by a single value across a device. We utilize optical microscopy to spatially resolve the magnetoluminescence effect of an OLED and show the intra-device variation of this spin property reaches nearly 30%. We explore how the variation of this property changes with the operating bias to probe the underlying spin physics and show that these molecular-scale interactions are spatially correlated microscopically over the device.
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