Solar energy paper index
Ultrafast exciton-polaron dynamics in 2D Ruddlesden-Popper lead-halide perovskites
One-line summary
A solar energy research paper on Ultrafast exciton-polaron dynamics in 2D Ruddlesden-Popper lead-halide perovskites.
Engineering notes
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Chinese explanation / 中文解读
中文解读待补充：本站会优先为光伏效率、钙钛矿太阳能电池、储能技术、太阳能热利用、BIPV、并网技术等高价值论文补充中文说明。
Original abstract
Two-dimensional Ruddlesden-Popper (2D RP) hybrid perovskites exhibit enhanced chemical and structural stability compared with three-dimensional (3D) counterparts, making them attractive for optoelectronic applications. However, a quantitative understanding of coupled free-exciton (FE) and exciton-polaron (EP) dynamics in strict monolayer ( n = 1) RP perovskites remains limited. Here, we report a systematic investigation of FE-EP branching, interconversion, and interactions in monolayer 2D RP perovskites using femtosecond transient absorption spectroscopy. Thin films with different organic spacers and fabrication routes are comparatively analyzed. We find EP binding energies of 50–65 meV in (BA) 2 PbI 4 and 37–39 meV in (PEA) 2 PbI 4 , together with a kinetic FE-EP balance persisting for tens of picoseconds. Films fabricated by the newly developed route exhibit weaker Auger annihilation and reduced hot-phonon bottlenecks, consistent with fewer traps and impurities. Rate-equation modeling quantitatively reproduces the coupled ultrafast dynamics.
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