Proceedings of Online International Conference on Hybrid and Organic Photovoltaics (OnlineHOPV20)
Publication date: 22nd May 2020
Hybrid organic-inorganic perovskites (HOIPs) possess a flexible crystal structure and a tunable hybrid organic-inorganic composition, this enables the incorporation of chiral ligands. Combine the impressive optical, electrical and spintronic properties of perovskite with chirality, chiral perovskites have received wide interest recently.[1]
We reported that spin polarization in perovskites can be controlled through introducing chirality as well as magnetic field. Through combined strategies of chirality transfer and energy funneling, we developed reduced-dimensional chiral perovskites. A 3% spin-polarized photoluminescence is observed in reduced-dimensional chiral perovskites even in the absence of an applied external magnetic field.[2] 3D achiral perovskites achieve a comparable degree of photoluminescencepolarization only under an external magnetic field of 5 Tesla.
Compared with the low-dimensional counterparts as discussed above, 3D HOIPs exhibit much smaller exciton binding energy and much longer charge-carrier diffusion lengths, making them more promising toward applications in chiroptoelectronics and spintronics after combining with chirality. However, the design of 3D chiral HOIPs is still challenging because the cuboctahedral cavity in 3D perovskites is very small, and only small organic cations (e.g.CH3NH3+ or NH2CHNH2+) or inorganic cations (e.g. Cs+ or Rb+) can be inserted. We demonstrated 3D hybrid organic-inorganic perovskites that implant chirality through introducing the chiral methylammonium cation. Based on structural optimization, phonon spectra, formation energy and ab initio molecular dynamics simulations, we found that the chirality of the chiral cations can be successfully transferred to the framework of 3D HOIPs, and the resulting 3D chiral HOIPs are both kinetically and thermodynamically stable.[3] Combining chirality with the impressive optical, electrical and spintronic properties of 3D perovskites, 3D chiral perovskites would be of great interest to the field of piezoelectricity, pyroelectricity, ferroelectricity, topological quantum optics, circularly polarized optoelectronics and spintronics.
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