AI Insight
Researchers at the Institute of Science Tokyo have discovered that the bulk photovoltaic effect (BPVE) can occur in materials that maintain a centrosymmetric average crystal structure, challenging the conventional understanding that BPVE requires noncentrosymmetric structures. Using the van der Waals material CuCrP2S6, they demonstrated that atomic motion allows photocurrent generation without a traditional p-n junction even when the material's overall structure appears symmetric. This finding reveals that dynamic atomic behavior, rather than static crystal symmetry alone, can enable photoelectric conversion.
Why it matters
This discovery could enable new approaches to developing more efficient solar cells that bypass conventional efficiency limits imposed by p-n junction designs. The findings expand the range of materials that could be used for photovoltaic applications and suggest new design principles for next-generation solar energy conversion devices.
Understand the Science
The bulk photovoltaic effect (BPVE), a photoelectric effect that generates photocurrent without a p–n junction, can persist even when a material’s average crystal structure remains centrosymmetric, a study from Institute of Science Tokyo has found. Researchers demonstrated this in CuCrP2S6, a van der Waals material that transitions from a noncentrosymmetric to a centrosymmetric average structure. The finding challenges the conventional view of BPVE and suggests a new strategy for enhancing photoelectric conversion.
Source: Atomic motion could help push solar cells beyond conventional limits