Hebrew University team develops contactless method to measure spin-selective charge separation in chiral perovskites
Researchers at the Institute of Chemistry and the Center for Nanoscience and Nanotechnology at the Hebrew University of Jerusalem, led by Dr. Joanna Dehnel and Dr. Igal Levine, have introduced a contactless technique for probing how chiral 2D perovskites respond differently to circularly polarized light, without first building the material into a complete electronic device.
Chiral perovskites exist in two mirror-image forms, much like a left and right hand, and are of growing interest for spintronics and optoelectronics because their crystal structure can couple light polarization, electrical charge and electron spin without requiring an external magnetic field. Studying that coupling has traditionally meant fabricating a full device with metal contacts, a step that can introduce defects and other artifacts that obscure the material’s intrinsic electronic response. To get around this, the team developed circularly polarized time-resolved surface photovoltage (CP-TRSPV), a technique that tracks how electrical charges separate inside the material under circularly polarized illumination, without a top electrical contact. The method can follow the resulting signal over an unusually wide time window, from nanoseconds to milliseconds.
Source: https://www.spintronics-info.com/hebrew-university-team-develops-contactless-method-measure-spin-selective
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