Scientists made a paper-thin plastic crystal that turns light into power just as well as expensive, high-tech sensors.
March 30, 2026
Original Paper
Suppressed excitonic effects enable high mobility, high-yield photoconductivity in a two-dimensional polymer crystal with axial pyridine coordination
arXiv · 2603.25812
The Takeaway
Usually, organic materials (like plastics) are poor conductors because light gets 'trapped' in tight energy bundles called excitons. By using a clever molecular 'bridge,' researchers allowed the energy to flow freely and instantly, potentially leading to ultra-efficient, flexible solar cells and cameras.
From the abstract
Two-dimensional polymers (2DPs) and their layer-stacked covalent organic frameworks (2D COFs) offer modular, atomically precise platforms for organic optoelectronics, yet their photoconductive responses remain fundamentally constrained by strong excitonic effects and localized charge transport. Here, we demonstrate that a diyne-linked 2DP crystal with axial pyridine coordination overcomes this limitation, enabling simultaneous efficient free-carrier generation and band-like transport. Introducin