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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
Thermally activated exciton dissociation and recombination control the carrier dynamics in organometal halide perovskite
Journal of Physical Chemistry Letters, Volume 5, No. 13, Year 2014
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Description
Solar cells based on organometal halide perovskites have seen rapidly increasing efficiencies, now exceeding 15%. Despite this progress, there is still limited knowledge on the fundamental photophysics. Here we use microwave photoconductance and photoluminescence measurements to investigate the temperature dependence of the carrier generation, mobility, and recombination in (CH3NH3)PbI3. At temperatures maintaining the tetragonal crystal phase of the perovskite, we find an exciton binding energy of about 32 meV, leading to a temperature-dependent yield of highly mobile (6.2 cm2/(V s) at 300 K) charge carriers. At higher laser intensities, second-order recombination with a rate constant of γ = 13 × 10 -10 cm3 s-1 becomes apparent. Reducing the temperature results in increasing charge carrier mobilities following a T -1.6 dependence, which we attribute to a reduction in phonon scattering (σμ = 16 cm2/(V s) at 165 K). Despite the fact that σμ increases, γ diminishes with a factor six, implying that charge recombination in (CH3NH3)PbI3 is temperature activated. The results underline the importance of the perovskite crystal structure, the exciton binding energy, and the activation energy for recombination as key factors in optimizing new perovskite materials. © 2014 American Chemical Society.
Authors & Co-Authors
Savenije, Tom J.
Netherlands, Delft
Delft University of Technology
Ponseca, Carlito S.
Sweden, Lund
Lunds Universitet
Abdellah, Mohamed A.
Sweden, Lund
Lunds Universitet
Zheng, Kaibo
Sweden, Lund
Lunds Universitet
Tian, Yuxi
Sweden, Lund
Lunds Universitet
Zhu, Qiushi
Sweden, Lund
Lunds Universitet
Canton E, Sophie E.
Sweden, Lund
Lunds Universitet
Scheblykin, Ivan G.
Sweden, Lund
Lunds Universitet
Pullèrits, Tönu T.
Sweden, Lund
Lunds Universitet
Yartsev, Arkady P.
Sweden, Lund
Lunds Universitet
Sundström, Villy
Sweden, Lund
Lunds Universitet
Statistics
Citations: 452
Authors: 11
Affiliations: 2
Identifiers
Doi:
10.1021/jz500858a
ISSN:
19487185