Efficient carrier transport in halide perovskites: theoretical perspectives
Journal Article
·
· Journal of Materials Chemistry. A
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
Recently, halide perovskites have been shown to exhibit excellent carrier transport properties. Density functional calculations are performed to study the electronic structure, dielectric properties, and defect properties of β-CH3NH3PbI3. Our results show that Pb chemistry plays an important role in a wide range of material properties, i.e., small effective masses, enhanced Born effective charges and lattice polarization, and the suppression of the formation of deep defect levels, all of which contribute to the exceptionally good carrier transport properties observed in CH3NH3PbI3. Defect calculations show that, among native point defects (including vacancies, interstitials, and antisites), only iodine vacancy is a low-energy deep trap and non-radiative recombination centre. Finaly, alloying iodide with chloride reduces the lattice constant of the iodide and significantly increases the formation energy of interstitial defects, which explains the observed substantial increase in carrier diffusion length in mixed halide CH3NH3PbI3Cl compared to that in CH3NH3PbI3.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1154829
- Journal Information:
- Journal of Materials Chemistry. A, Journal Name: Journal of Materials Chemistry. A Journal Issue: 24 Vol. 2; ISSN 2050-7488; ISSN JMCAET
- Publisher:
- Royal Society of Chemistry
- Country of Publication:
- United States
- Language:
- English
Similar Records
Self-regulation mechanism for charged point defects in hybrid halide perovskites
Large dielectric constant, high acceptor density, and deep electron traps in perovskite solar cell material CsGeI3
Journal Article
·
Wed Dec 10 19:00:00 EST 2014
· Angewandte Chemie (International Edition)
·
OSTI ID:1220703
Large dielectric constant, high acceptor density, and deep electron traps in perovskite solar cell material CsGeI3
Journal Article
·
Thu Dec 31 19:00:00 EST 2015
· Journal of Materials Chemistry. A
·
OSTI ID:1328304