Eeshani Bora, Jugal P. Das, Subarna Samanta, Abhishek Kumar and Tushar Debnath*,
{"title":"金杂化CsPbBr3钙钛矿纳米薄片的激子动力学。","authors":"Eeshani Bora, Jugal P. Das, Subarna Samanta, Abhishek Kumar and Tushar Debnath*, ","doi":"10.1021/acs.jpclett.5c01447","DOIUrl":null,"url":null,"abstract":"<p >Interaction of polar excitations in quantum size particles and localized surface plasmons in metallic nanoparticles results in formation of a quasi-particle called plexciton, a coupled exciton–plasmon polariton. We report observation of thickness dependent plexcitons in Au-hybrid CsPbBr<sub>3</sub> nanoplatelets (NPls) using optical spectroscopic measurements. Our results suggest that the greater quantum and dielectric confinement leads to extremely large exciton binding energies in thin CsPbBr<sub>3</sub> NPls, enhancing the Fröhlich interaction. In effect, exciton–phonon scattering phenomenon dominates the exciton decay dynamics in thin NPls. Surprisingly, the exciton–phonon scattering vanishes completely on Au-incorporation in thin CsPbBr<sub>3</sub> NPls, directing the formation of strong plexcitons by coupling between the localized surface plasmons of Au and the confined excitons in thin NPls. Here the plasmon induced electric field propagates through the NPls, thus altering the dielectric field strengths responsible for such elevated exciton binding energy and introducing additional screening effects to the excitons. In turn, the exciton binding energy reduces significantly, hindering the exciton–phonon interaction. Moreover, the weakened exciton binding energy extends the exciton lifetime and increases the free carrier yield, which shows a clear thickness dependence, highlighting their promising applications in nonlinear optoelectronics.</p>","PeriodicalId":62,"journal":{"name":"The Journal of Physical Chemistry Letters","volume":"16 28","pages":"7134–7139"},"PeriodicalIF":4.6000,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Plexciton Dynamics in Au-Hybrid CsPbBr3 Perovskite Nanoplatelets\",\"authors\":\"Eeshani Bora, Jugal P. Das, Subarna Samanta, Abhishek Kumar and Tushar Debnath*, \",\"doi\":\"10.1021/acs.jpclett.5c01447\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p >Interaction of polar excitations in quantum size particles and localized surface plasmons in metallic nanoparticles results in formation of a quasi-particle called plexciton, a coupled exciton–plasmon polariton. We report observation of thickness dependent plexcitons in Au-hybrid CsPbBr<sub>3</sub> nanoplatelets (NPls) using optical spectroscopic measurements. Our results suggest that the greater quantum and dielectric confinement leads to extremely large exciton binding energies in thin CsPbBr<sub>3</sub> NPls, enhancing the Fröhlich interaction. In effect, exciton–phonon scattering phenomenon dominates the exciton decay dynamics in thin NPls. Surprisingly, the exciton–phonon scattering vanishes completely on Au-incorporation in thin CsPbBr<sub>3</sub> NPls, directing the formation of strong plexcitons by coupling between the localized surface plasmons of Au and the confined excitons in thin NPls. Here the plasmon induced electric field propagates through the NPls, thus altering the dielectric field strengths responsible for such elevated exciton binding energy and introducing additional screening effects to the excitons. In turn, the exciton binding energy reduces significantly, hindering the exciton–phonon interaction. Moreover, the weakened exciton binding energy extends the exciton lifetime and increases the free carrier yield, which shows a clear thickness dependence, highlighting their promising applications in nonlinear optoelectronics.</p>\",\"PeriodicalId\":62,\"journal\":{\"name\":\"The Journal of Physical Chemistry Letters\",\"volume\":\"16 28\",\"pages\":\"7134–7139\"},\"PeriodicalIF\":4.6000,\"publicationDate\":\"2025-07-03\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"The Journal of Physical Chemistry Letters\",\"FirstCategoryId\":\"1\",\"ListUrlMain\":\"https://pubs.acs.org/doi/10.1021/acs.jpclett.5c01447\",\"RegionNum\":2,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"CHEMISTRY, PHYSICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"The Journal of Physical Chemistry Letters","FirstCategoryId":"1","ListUrlMain":"https://pubs.acs.org/doi/10.1021/acs.jpclett.5c01447","RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
Plexciton Dynamics in Au-Hybrid CsPbBr3 Perovskite Nanoplatelets
Interaction of polar excitations in quantum size particles and localized surface plasmons in metallic nanoparticles results in formation of a quasi-particle called plexciton, a coupled exciton–plasmon polariton. We report observation of thickness dependent plexcitons in Au-hybrid CsPbBr3 nanoplatelets (NPls) using optical spectroscopic measurements. Our results suggest that the greater quantum and dielectric confinement leads to extremely large exciton binding energies in thin CsPbBr3 NPls, enhancing the Fröhlich interaction. In effect, exciton–phonon scattering phenomenon dominates the exciton decay dynamics in thin NPls. Surprisingly, the exciton–phonon scattering vanishes completely on Au-incorporation in thin CsPbBr3 NPls, directing the formation of strong plexcitons by coupling between the localized surface plasmons of Au and the confined excitons in thin NPls. Here the plasmon induced electric field propagates through the NPls, thus altering the dielectric field strengths responsible for such elevated exciton binding energy and introducing additional screening effects to the excitons. In turn, the exciton binding energy reduces significantly, hindering the exciton–phonon interaction. Moreover, the weakened exciton binding energy extends the exciton lifetime and increases the free carrier yield, which shows a clear thickness dependence, highlighting their promising applications in nonlinear optoelectronics.
期刊介绍:
The Journal of Physical Chemistry (JPC) Letters is devoted to reporting new and original experimental and theoretical basic research of interest to physical chemists, biophysical chemists, chemical physicists, physicists, material scientists, and engineers. An important criterion for acceptance is that the paper reports a significant scientific advance and/or physical insight such that rapid publication is essential. Two issues of JPC Letters are published each month.