{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"0dece82a46c450b7c500848264557d7b8e4f61961e846e74ec73335e785cb860","created":"2026-10-03T07:17:59Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"f23e13e7d9fd47a0bc10c510137f488b0be1946ff50bd4de521d8ebd131d1eba","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"mechanism","assisted_by":[],"external_id":"cm.halide-perovskites.hot-carrier-cooling","kind":"phenomenon","literature_status":"partially-resolved","n":"1","parents":[],"plain":"Light with extra energy creates hot charges that normally lose that excess to the lattice within a fraction of a trillionth of a second. In perovskites they stay hot much longer at high light intensity, and why is debated.","posed_since":"","precise":"At excitation densities above about $1e18\\,\\mathrm{cm}^{-3}$, hot-carrier cooling in MAPbI3 and CsPbBr3 slows from about 0.3 ps to tens or hundreds of ps. Separate the contributions of the hot-phonon bottleneck (slow decay of longitudinal-optical phonons), Auger reheating, and large-polaron screening, and determine whether any slowdown persists below $1e17\\,\\mathrm{cm}^{-3}$, the density under sunlight. An answer is quantified cooling-time contributions versus density and temperature.","problem_ref":null,"references":"","settled_by":"Density-resolved two-dimensional or transient spectroscopy with direct phonon-population probes, reproduced by a coupled carrier-phonon kinetic model.","status_note":"The hot-phonon bottleneck at high density is widely accepted; the low-density polaron-screening claim remains contested.","title":"Mechanism of slow hot-carrier cooling in lead-halide perovskites","topic_ref":"56bceea3ae46655d4fa657e5e962c04f828a636d2ee81dabedfcad2bf6f6582c"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"5ee2e10d27d8219cd612b8ced707c297bf67d5a12bf4fa61580742646a4a2542","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"7e5a40cf4246c791d580c683701f5588f46da526219288663b60b61fe76e8513","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"9-ly4HRVWXN829NCybZlTEovN_r8IccgTLlI-N8PuoJncA2fjGTFRZ06CINyygETScr7PbKqh1tRbmab6B00AA"},"schema":"pubphys.envelope/1"},"record_hash":"5ee2e10d27d8219cd612b8ced707c297bf67d5a12bf4fa61580742646a4a2542","leaf_index":1005}