Lattice anchoring stabilizes solution-processed semiconductors

Mengxia Liu, Yuelang Chen, Chih-Shan Tan, Rafael Quintero-Bermudez, Andrew H. Proppe, Rahim Munir, Hairen Tan, Oleksandr Voznyy, Benjamin Scheffel, Grant Walters, Andrew Pak Tao Kam, Bin Sun, Min-Jae Choi, Sjoerd Hoogland, Aram Amassian, Shana O. Kelley, F. Pelayo García de Arquer and Edward H. Sargent ()
Additional contact information
Mengxia Liu: University of Toronto
Yuelang Chen: University of Toronto
Chih-Shan Tan: University of Toronto
Rafael Quintero-Bermudez: University of Toronto
Andrew H. Proppe: University of Toronto
Rahim Munir: KAUST Solar Center (KSC) and Physical Sciences and Engineering Division, King Abdullah University of Science and Technology
Hairen Tan: University of Toronto
Oleksandr Voznyy: University of Toronto
Benjamin Scheffel: University of Toronto
Grant Walters: University of Toronto
Andrew Pak Tao Kam: University of Toronto
Bin Sun: University of Toronto
Min-Jae Choi: University of Toronto
Sjoerd Hoogland: University of Toronto
Aram Amassian: KAUST Solar Center (KSC) and Physical Sciences and Engineering Division, King Abdullah University of Science and Technology
Shana O. Kelley: University of Toronto
F. Pelayo García de Arquer: University of Toronto
Edward H. Sargent: University of Toronto

Nature, 2019, vol. 570, issue 7759, 96-101

Abstract: Abstract The stability of solution-processed semiconductors remains an important area for improvement on their path to wider deployment. Inorganic caesium lead halide perovskites have a bandgap well suited to tandem solar cells1 but suffer from an undesired phase transition near room temperature2. Colloidal quantum dots (CQDs) are structurally robust materials prized for their size-tunable bandgap3; however, they also require further advances in stability because they are prone to aggregation and surface oxidization at high temperatures as a consequence of incomplete surface passivation4,5. Here we report ‘lattice-anchored’ hybrid materials that combine caesium lead halide perovskites with lead chalcogenide CQDs, in which lattice matching between the two materials contributes to a stability exceeding that of the constituents. We find that CQDs keep the perovskite in its desired cubic phase, suppressing the transition to the undesired lattice-mismatched phases. The stability of the CQD-anchored perovskite in air is enhanced by an order of magnitude compared with pristine perovskite, and the material remains stable for more than six months at ambient conditions (25 degrees Celsius and about 30 per cent humidity) and more than five hours at 200 degrees Celsius. The perovskite prevents oxidation of the CQD surfaces and reduces the agglomeration of the nanoparticles at 100 degrees Celsius by a factor of five compared with CQD controls. The matrix-protected CQDs show a photoluminescence quantum efficiency of 30 per cent for a CQD solid emitting at infrared wavelengths. The lattice-anchored CQD:perovskite solid exhibits a doubling in charge carrier mobility as a result of a reduced energy barrier for carrier hopping compared with the pure CQD solid. These benefits have potential uses in solution-processed optoelectronic devices.

Date: 2019
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DOI: 10.1038/s41586-019-1239-7

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