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@ARTICLE{MAL:640731,
      author       = {MAL, SOUVIK and Sadhukhan, Priyabrata and Halder, Mithun
                      and Sharma, Jay and Singh, Anar and Das, Gangadhar and
                      Bhunia, Satyaban and Das, Sachindranath},
      title        = {{U}nraveling the structural phase transition and its effect
                      on photophysical properties of mechanochemically synthesized
                      {CH}$_3${NH}$_3${P}b{B}r$_3$},
      journal      = {Journal of physics / D},
      volume       = {58},
      number       = {41},
      issn         = {0508-3443},
      address      = {Bristol},
      publisher    = {IOP Publ.},
      reportid     = {PUBDB-2025-04868},
      pages        = {415303},
      year         = {2025},
      note         = {Waiting for fulltext},
      abstract     = {The mechanochemical synthesis route has become popular for
                      the solvent-free synthesis of a wide range of hybrid halide
                      perovskites. This work demonstrates that mechanochemically
                      synthesized CH$_3$NH$_3$PbBr$_3$ is thermally more stable
                      compared to chemically processed material and free from
                      deep-level defects. Temperature-dependent structural study
                      on mechanochemically synthesized material reveals that it
                      exhibits a cubic phase at room temperature with a phase
                      transition from cubic to tetragonal phase at 230 K. Below
                      150 K, it transforms into an orthorhombic phase, which
                      belongs to an incommensurately modulated crystal structure
                      (Imma(s00)00γ). Unlike the early reports, the orthorhombic
                      Pnma structure is absent, and the modulated phase is
                      extended over a wide range of temperatures from 145 K to 100
                      K. Temperature-dependent photoluminescence study shows that
                      the emission spectrum comprises both the contribution from
                      free and bound excitons. The blueshift of the bandgap with
                      increasing lattice temperature can be explained by the large
                      volume expansion coefficient (of the order 10−4), which
                      dominates over the contribution due to electron–phonon
                      coupling. The linewidth broadening of the emission spectrum
                      is mainly due to the interaction of the longitudinal optical
                      phonon with the free electron. The photo-generated exciton
                      exhibits high activation energy (∼100 meV) at room
                      temperature, demonstrating its potential for light-emitting
                      device applications.},
      cin          = {DOOR ; HAS-User},
      ddc          = {530},
      cid          = {I:(DE-H253)HAS-User-20120731},
      pnm          = {6G3 - PETRA III (DESY) (POF4-6G3) / FS-Proposal: I-20200429
                      (I-20200429) / INDIA-DESY - INDIA-DESY Collaboration
                      $(2020_Join2-INDIA-DESY)$},
      pid          = {G:(DE-HGF)POF4-6G3 / G:(DE-H253)I-20200429 /
                      $G:(DE-HGF)2020_Join2-INDIA-DESY$},
      experiment   = {EXP:(DE-H253)P-P02.1-20150101},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1088/1361-6463/ae0c20},
      url          = {https://bib-pubdb1.desy.de/record/640731},
}