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Quantifying Optical Disorder in CsFaPb(Br,I)3 Perovskites via Urbach Energy Analysis Using OPAL2 Fresnel-Based Simulations
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DOI：10.1002/apxr.202500187.png)
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Abstract
En 中文
This study examines light-matter interactions in CsFAPb(Br, I)3 perovskite thin films by analyzing their absorption, reflection, and emission properties using Fresnel-based OPAL2 simulations. The optical spectra show sharp absorption edges at 1.55 - 1.60 eV for CH3NH3PbI3 and triple-cation perovskites, which blue-shift to similar to 1.8 eV with increasing bromide content. Urbach energies (0.082 - 0.410 eV) indicate rising energetic disorder as Br incorporation increases. Ray-tracing simulations reveal strong optical confinement, with the CsFAPbIBr (1.62 eV) composition achieving optimal performance, where similar to 66% of incident photons contribute to photogeneration and similar to 26% are lost to reflection and parasitic absorption. Overall, the results demonstrate tunable bandgaps, efficient photon management, and a clear link between structural coherence, electronic disorder, and optoelectronic performance.
Keywords:
absorption
CsFAPb(Br,I)3
emission
urbach energies
Journal
A
IF:
2.8
Papers:
85
Citations:
482
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