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SUMMARY:Controlling charge\, spin and light in Lead-Halide Inspired Hybrid
  Semiconductors - Matthew C. Beard
DTSTART:20210427T143000Z
DTEND:20210427T153000Z
UID:TALK159778@talks.cam.ac.uk
CONTACT:Mengxia Liu
DESCRIPTION:Hybrid organic/metal-halide inorganic semiconductors offer tre
 mendous opportunities to control fundamental properties that underpin ener
 gy technologies. While currently there are enormous worldwide efforts expl
 oring\, exploiting and improving a narrow class of these hybrid semiconduc
 tors (metal-halide perovskite semiconductors (MHP)\, such as methylammoniu
 m lead iodide (MAPbI3))\, primarily for photovoltaic (PV) applications\, a
 n opportunity exists to transcend this initial focus and seek deeper under
 standing and control of their fundamental properties.\nIn this presentatio
 n I will discuss our studies of controlling the charge carrier dynamics\, 
 light/matter interactions\, and spin populations in these novel hybrid sys
 tems. In one effort we are exploring the use of novel organic hybrid syste
 ms at and near interfaces to control the carrier dynamics and reduce surfa
 ce recombination but also to protect grain boundary surfaces from degradat
 ion. With respect to controlling spins we have recently studied and develo
 ped a novel class of chiral hybrid semiconductors based upon layered metal
 -halide perovskite 2D Ruddlesden-Popper type structures. These systems exh
 ibit chiral induced spin selectivity whereby only one spin sense can trans
 port across the film and the other spin sense is blocked. From these syste
 ms we can achieve a high degree of spin current polarization and injection
  when used as a contact layer. We have developed novel spin-based LEDs usi
 ng mixed NCs as the light emitting layer that promotes light emission at a
  highly spin-polarized interface. The LED spin-polarization is limited by 
 spin-depolarization within the MHP NCs. In a separate effort we have explo
 red the use of chiral copper-halide hybrid systems for circular light pola
 rized detection. Chiral based copper-halide systems combined with highly c
 onductive carbon nanotube networks can be employed to detect circular pola
 rized light with the use of polarizers. Our chiral heterostructure shows h
 igh photoresponsivity of 452 A/W\, a competitive anisotropy factor of up t
 o 21%\, a current response in microamperes\, and low working voltage down 
 to 0.01 V. These results demonstrate that the emergent properties of organ
 ic−inorganic hybrid systems offer unique opportunities in controlling li
 ght\, charge and spin.
LOCATION:https://zoom.us/j/93354763593?pwd=Slk1V2psUDNqZzFFSVZHbWEzejNQZz0
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