semiconductor-digest.com
Oct 2, 2026
Crystal Design Controls Spin-Polarized Photocurrent in 2D Hybrid Perovskites
AI-summarised brief · reviewed before publication
Researchers at Science Tokyo demonstrated that the circular photogalvanic effect (CPGE) in two‑dimensional organic–inorganic hybrid perovskites originates from the bulk crystal rather than surface layers. Using circularly polarized light at normal incidence, they measured helicity‑dependent photocurrents that reversed with light handedness and vanished when electrodes were rotated, confirming bulk symmetry predictions. The study employed lead‑iodide layered crystals with polar organic cations, and extended the test to chiral‑polar variants to verify the intrinsic bulk origin. The findings provide a method to control spin‑polarized photocurrents for opto‑spintronic devices.
💡 Why It Matters
- · By isolating bulk‑derived CPGE, the work removes a key ambiguity that has hindered spin‑photocurrent engineering, enabling precise design of low‑power, spin‑based optoelectronic components.
