Issue 3, 2023

Superlattice deformation in quantum dot films on flexible substrates via uniaxial strain

Abstract

The superlattice in a quantum dot (QD) film on a flexible substrate deformed by uniaxial strain shows a phase transition in unit cell symmetry. With increasing uniaxial strain, the QD superlattice unit cell changes from tetragonal to cubic to tetragonal phase as measured with in situ grazing-incidence small-angle X-ray scattering (GISAXS). The respective changes in the optoelectronic coupling are probed with photoluminescence (PL) measurements. The PL emission intensity follows the phase transition due to the resulting changing inter-dot distances. The changes in PL intensity accompany a redshift in the emission spectrum, which agrees with the Förster resonance energy transfer (FRET) theory. The results are essential for a fundamental understanding of the impact of strain on the performance of flexible devices based on QD films, such as wearable electronics and next-generation solar cells on flexible substrates.

Graphical abstract: Superlattice deformation in quantum dot films on flexible substrates via uniaxial strain

Supplementary files

Article information

Article type
Communication
Submitted
24 nov 2022
Accepted
20 jan 2023
First published
23 jan 2023

Nanoscale Horiz., 2023,8, 383-395

Superlattice deformation in quantum dot films on flexible substrates via uniaxial strain

J. E. Heger, W. Chen, H. Zhong, T. Xiao, C. Harder, F. A. C. Apfelbeck, A. F. Weinzierl, R. Boldt, L. Schraa, E. Euchler, A. K. Sambale, K. Schneider, M. Schwartzkopf, S. V. Roth and P. Müller-Buschbaum, Nanoscale Horiz., 2023, 8, 383 DOI: 10.1039/D2NH00548D

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