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Coupling to octahedral tilts in halide perovskite nanocrystals induces phonon-mediated attractive interactions between excitons

Journal Article · · Nature Physics
 [1];  [2];  [3];  [3];  [4];  [5];  [6];  [5];  [2];  [7];  [2];  [7];  [8];  [8];  [8];  [8];  [8];  [8];  [4];  [9] more »;  [2];  [7];  [10] « less
  1. Stanford Univ., CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Eidgenoessische Technische Hochschule (ETH), Zurich (Switzerland); SLAC
  2. Eidgenoessische Technische Hochschule (ETH), Zurich (Switzerland); Swiss Federal Laboratories for Materials Science and Technology (Empa), Dübendorf (Switzerland)
  3. Universita degli Studi dell'Insubria, Como (Italy)
  4. Univ. of Geneva (Switzerland)
  5. Argonne National Laboratory (ANL), Argonne, IL (United States)
  6. Stanford Univ., CA (United States); Middlebury College, VT (United States)
  7. Eidgenoessische Technische Hochschule (ETH), Zurich (Switzerland)
  8. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
  9. Consiglio Nazionale delle Ricerche (CNR), Como (Italy)
  10. Stanford Univ., CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES) and Photon Ultrafast Laser Science and Engineering Institute (PULSE)

Understanding the origin of electron–phonon coupling in lead halide perovskites is key to interpreting and leveraging their optical and electronic properties. Here we show that photoexcitation drives a reduction of the lead–halide–lead bond angles, a result of deformation potential coupling to low-energy optical phonons. We accomplish this by performing femtosecond-resolved, optical-pump–electron-diffraction-probe measurements to quantify the lattice reorganization occurring as a result of photoexcitation in nanocrystals of FAPbBr3. Our results indicate a stronger coupling in FAPbBr3 than CsPbBr3. We attribute the enhanced coupling in FAPbBr3 to its disordered crystal structure, which persists down to cryogenic temperatures. We find the reorganizations induced by each exciton in a multi-excitonic state constructively interfere, giving rise to a coupling strength that scales quadratically with the exciton number. This superlinear scaling induces phonon-mediated attractive interactions between excitations in lead halide perovskites.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
AC02-76SF00515; AC02-05CH11231; SC0019140
OSTI ID:
2280850
Journal Information:
Nature Physics, Journal Name: Nature Physics Journal Issue: 1 Vol. 20; ISSN 1745-2473
Publisher:
Nature Publishing Group (NPG)Copyright Statement
Country of Publication:
United States
Language:
English

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