Show simple item record

dc.contributor.authorHutter, EM
dc.contributor.authorGélvez-Rueda, MC
dc.contributor.authorOsherov, A
dc.contributor.authorBulović, V
dc.contributor.authorGrozema, FC
dc.contributor.authorStranks, Samuel
dc.contributor.authorSavenije, TJ
dc.date.accessioned2017-08-16T08:42:44Z
dc.date.available2017-08-16T08:42:44Z
dc.date.issued2017-01
dc.identifier.issn1476-4660
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/266446
dc.description.abstractMetal halide perovskites such as methylammonium lead iodide (CH3NH3PbI3) are generating great excitement due to their outstanding optoelectronic properties, which lend them to application in high-efficiency solar cells and light-emission devices. However, there is currently debate over what drives the second-order electron-hole recombination in these materials. Here, we propose that the bandgap in CH3NH3PbI3 has a direct-indirect character. Time-resolved photo-conductance measurements show that generation of free mobile charges is maximized for excitation energies just above the indirect bandgap. Furthermore, we find that second-order electron-hole recombination of photo-excited charges is retarded at lower temperature. These observations are consistent with a slow phonon-assisted recombination pathway via the indirect bandgap. Interestingly, in the low-temperature orthorhombic phase, fast quenching of mobile charges occurs independent of the temperature and photon excitation energy. Our work provides a new framework to understand the optoelectronic properties of metal halide perovskites and analyse spectroscopic data.
dc.languageeng
dc.language.isoen
dc.publisherNature Publishing Group
dc.titleDirect-indirect character of the bandgap in methylammonium lead iodide perovskite.
dc.typeArticle
prism.endingPage120
prism.publicationNameNature Materials
prism.startingPage115
prism.volume16
dc.identifier.doi10.17863/CAM.12468
dcterms.dateAccepted2016-09-05
rioxxterms.versionofrecord10.1038/nmat4765
rioxxterms.versionAM
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserved
rioxxterms.licenseref.startdate2016-09-05
dc.contributor.orcidStranks, Samuel [0000-0002-8303-7292]
dc.identifier.eissn1476-4660
rioxxterms.typeJournal Article/Review
pubs.funder-project-idEuropean Commission (622630)
cam.issuedOnline2016-10-03


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record