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Understanding Quantum Confinement of Charge Carriers in Layered 2D Hybrid Perovskites
Author(s) -
Even Jacky,
Pedesseau Laurent,
Katan Claudine
Publication year - 2014
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201402428
Subject(s) - superlattice , effective mass (spring–mass system) , charge carrier , semiconductor , quantum dot , dielectric , quantum , quantum well , materials science , potential well , condensed matter physics , nanotechnology , chemical physics , chemistry , physics , optoelectronics , quantum mechanics , laser
Layered hybrid organic perovskites (HOPs) structures are a class of low‐cost two‐dimensional materials that exhibit outstanding optical properties, related to dielectric and quantum confinement effects. Whereas modeling and understanding of quantum confinement are well developed for conventional semiconductors, such knowledge is still lacking for 2D HOPs. In this work, concepts of effective mass and quantum well are carefully investigated and their applicability to 2D HOPs is discussed. For ultrathin layers, the effective‐mass model fails. Absence of superlattice coupling and importance of non‐parabolicity effects prevents the use of simple empirical models based on effective masses and envelope function approximations. An alternative method is suggested in which 2D HOPs are treated as composite materials, and a first‐principles approach to the calculation of band offsets is introduced. These findings might also be relevant for other classes of layered 2D functional materials.