AI Article Synopsis
- A quantum dot film on a flexible substrate undergoes a phase transition from tetragonal to cubic and back to tetragonal as uniaxial strain is applied, which is observed using grazing-incidence small-angle X-ray scattering (GISAXS).
- Changes in optoelectronic properties, indicated by photoluminescence (PL) measurements, correlate with the phase transitions and involve variations in inter-dot distances.
- The study highlights the importance of understanding strain effects on quantum dot films for advancing flexible electronics and solar technologies.
Article 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 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.
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| http://dx.doi.org/10.1039/d2nh00548d | DOI Listing |
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