Feldmann, S;
Macpherson, S;
Senanayak, SP;
Abdi-Jalebi, M;
Rivett, JPH;
Nan, G;
Tainter, GD;
... Deschler, F; + view all
(2020)
Photodoping through local charge carrier accumulation in alloyed hybrid perovskites for highly efficient luminescence.
Nature Photonics
, 14
(2)
pp. 123-128.
10.1038/s41566-019-0546-8.
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Abstract
Metal halide perovskites have emerged as exceptional semiconductors for optoelectronic applications. Substitution of the monovalent cations has advanced luminescence yields and device efficiencies. Here, we control the cation alloying to enhance optoelectronic performance through alteration of the charge carrier dynamics in mixed-halide perovskites. In contrast to single-halide perovskites, we find high luminescence yields for photoexcited carrier densities far below solar illumination conditions. Using time-resolved spectroscopy we show that the charge carrier recombination regime changes from second to first order within the first tens of nanoseconds after excitation. Supported by microscale mapping of the optical bandgap, electrically gated transport measurements and first-principles calculations, we demonstrate that spatially varying energetic disorder in the electronic states causes local charge accumulation, creating p- and n-type photodoped regions, which unearths a strategy for efficient light emission at low charge-injection in solar cells and light-emitting diodes.
| Type: | Article |
|---|---|
| Title: | Photodoping through local charge carrier accumulation in alloyed hybrid perovskites for highly efficient luminescence |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1038/s41566-019-0546-8 |
| Publisher version: | https://doi.org/10.1038/s41566-019-0546-8 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Materials for devices, Solar cells, Optical spectroscopy |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > MAPS Faculty Office UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > MAPS Faculty Office > Institute for Materials Discovery |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10092524 |
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