تقرير
Effect of Dimensionality on the Optical Absorption Properties of CsPbI$_3$ Perovskite Nanocrystals
| العنوان: | Effect of Dimensionality on the Optical Absorption Properties of CsPbI$_3$ Perovskite Nanocrystals |
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| المؤلفون: | Liu, Albert, Bonato, Luiz G., Sessa, Francesco, Almeida, Diogo B., Isele, Erik, Nagamine, Gabriel, Zagonel, Luiz F., Nogueira, Ana F., Padilha, Lazaro A., Cundiff, Steven T. |
| المصدر: | J. Chem. Phys. 151, 191103 (2019) |
| سنة النشر: | 2019 |
| المجموعة: | Condensed Matter Physics (Other) |
| مصطلحات موضوعية: | Physics - Applied Physics, Condensed Matter - Materials Science |
| الوصف: | The band-gaps of CsPbI$_3$ perovskite nanocrystals are measured by absorption spectroscopy at cryogenic temperatures. Anomalous band-gap shifts are observed in CsPbI$_3$ nanocubes and nanoplatelets, which are modeled accurately by band-gap renormalization due to lattice vibrational modes. We find that decreasing dimensionality of the CsPbI$_3$ lattice in nanoplatelets greatly reduces electron-phonon coupling, and dominant out-of-plane quantum confinement results in a homogeneously broadened absorption lineshape down to cryogenic temperatures. An absorption tail forms at low-temperatures in CsPbI$_3$ nanocubes, which we attribute to shallow defect states positioned near the valence band-edge. |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1063/1.5124399 |
| URL الوصول: | http://arxiv.org/abs/1908.04881 |
| رقم الأكسشن: | edsarx.1908.04881 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1063/1.5124399 |
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