Direct-indirect character of the bandgap in methylammonium lead iodide perovskite.
dc.contributor.author | Hutter, EM | |
dc.contributor.author | Gélvez-Rueda, MC | |
dc.contributor.author | Osherov, A | |
dc.contributor.author | Bulović, V | |
dc.contributor.author | Grozema, FC | |
dc.contributor.author | Stranks, SD | |
dc.contributor.author | Savenije, TJ | |
dc.date.accessioned | 2017-08-16T08:42:44Z | |
dc.date.available | 2017-08-16T08:42:44Z | |
dc.date.issued | 2017-01 | |
dc.identifier.issn | 1476-4660 | |
dc.identifier.uri | https://www.repository.cam.ac.uk/handle/1810/266446 | |
dc.description.abstract | Metal 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.language | eng | |
dc.language.iso | en | |
dc.publisher | Nature Publishing Group | |
dc.title | Direct-indirect character of the bandgap in methylammonium lead iodide perovskite. | |
dc.type | Article | |
prism.endingPage | 120 | |
prism.publicationName | Nature Materials | |
prism.startingPage | 115 | |
prism.volume | 16 | |
dc.identifier.doi | 10.17863/CAM.12468 | |
dcterms.dateAccepted | 2016-09-05 | |
rioxxterms.versionofrecord | 10.1038/nmat4765 | |
rioxxterms.version | AM | |
rioxxterms.licenseref.uri | http://www.rioxx.net/licenses/all-rights-reserved | |
rioxxterms.licenseref.startdate | 2016-09-05 | |
dc.contributor.orcid | Stranks, Samuel [0000-0002-8303-7292] | |
dc.identifier.eissn | 1476-4660 | |
rioxxterms.type | Journal Article/Review | |
pubs.funder-project-id | European Commission (622630) | |
cam.issuedOnline | 2016-10-03 |