TY - JOUR
T1 - Charge carrier localised in zero-dimensional (CH3NH3)3Bi2I9 clusters
AU - Ni, Chengsheng
AU - Hedley, Gordon
AU - Payne, Julia
AU - Svrcek, Vladimir
AU - McDonald, C
AU - Jagadamma, Lethy Krishnan
AU - Edwards, Paul
AU - Martin, Robert
AU - Jain, Gunisha
AU - Carolan, Darragh
AU - Mariotti, D
AU - Maguire, P
AU - Samuel, Ifor
AU - Irvine, John
PY - 2017/8/1
Y1 - 2017/8/1
N2 - A metal-organic hybrid perovskite (CH3NH3PbI3) with three-dimensional framework of metal-halide octahedra has been reported as a low-cost, solution-processable absorber for a thin-film solar cell with a power-conversion efficiency over 20%. Low-dimensional layered perovskites with metal halide slabs separated by the insulating organic layers are reported to show higher stability, but the efficiencies of the solar cells are limited by the confinement of excitons. In order to explore the confinement and transport of excitons in zero-dimensional metal-organic hybrid materials, a highly orientated film of (CH3NH3)3Bi2I9 with nanometre-sized core clusters of Bi2I93- surrounded by insulating CH3NH3+ was prepared via solution processing. The (CH3NH3)3Bi2I9 film shows highly anisotropic photoluminescence emission and excitation due to the large proportion of localised excitons coupled with delocalised excitons from intercluster energy transfer. The abrupt increase in photoluminescence quantum yield at excitation energy above twice band gap could indicate a quantum cutting due to the low dimensionality.
AB - A metal-organic hybrid perovskite (CH3NH3PbI3) with three-dimensional framework of metal-halide octahedra has been reported as a low-cost, solution-processable absorber for a thin-film solar cell with a power-conversion efficiency over 20%. Low-dimensional layered perovskites with metal halide slabs separated by the insulating organic layers are reported to show higher stability, but the efficiencies of the solar cells are limited by the confinement of excitons. In order to explore the confinement and transport of excitons in zero-dimensional metal-organic hybrid materials, a highly orientated film of (CH3NH3)3Bi2I9 with nanometre-sized core clusters of Bi2I93- surrounded by insulating CH3NH3+ was prepared via solution processing. The (CH3NH3)3Bi2I9 film shows highly anisotropic photoluminescence emission and excitation due to the large proportion of localised excitons coupled with delocalised excitons from intercluster energy transfer. The abrupt increase in photoluminescence quantum yield at excitation energy above twice band gap could indicate a quantum cutting due to the low dimensionality.
KW - perovskite
UR - https://doi.org/10.1038/s41467-017-00261-9
UR - https://pure.ulster.ac.uk/en/publications/charge-carrier-localised-in-zero-dimensional-ch3nh33bi2i9-cluster-3
U2 - 10.1038/s41467-017-00261-9
DO - 10.1038/s41467-017-00261-9
M3 - Article
C2 - 28761100
SN - 2041-1723
VL - 8
JO - Nature Communications
JF - Nature Communications
M1 - 170
ER -