تقرير
Dynamic lattice distortions driven by surface trapping in semiconductor nanocrystals
| العنوان: | Dynamic lattice distortions driven by surface trapping in semiconductor nanocrystals |
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| المؤلفون: | Guzelturk, Burak, Cotts, Benjamin L., Jasrasaria, Dipti, Philbin, John P., Hanifi, David A., Koscher, Brent A., Balan, Arunima D., Curling, Ethan, Zajac, Marc, Park, Suji, Yazdani, Nuri, Nyby, Clara, Kamysbayev, Vladislav, Fischer, Stefan, Nett, Zach, Shen, Xiaozhe, Kozina, Michael E., Lin, Ming-Fu, Reid, Alexander H., Weathersby, Stephen P., Schaller, Richard D., Wood, Vanessa, Wang, Xijie, Dionne, Jennifer A., Talapin, Dmitri V., Alivisatos, A. Paul, Salleo, Alberto, Rabani, Eran, Lindenberg, Aaron M. |
| المصدر: | Nature Communications (2021) |
| سنة النشر: | 2021 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Mesoscale and Nanoscale Physics |
| الوصف: | Nonradiative processes limit optoelectronic functionality of nanocrystals and curb their device performance. Nevertheless, the dynamic structural origins of nonradiative relaxations in nanocrystals are not understood. Here, femtosecond electron diffraction measurements corroborated by atomistic simulations uncover transient lattice deformations accompanying radiationless electronic processes in semiconductor nanocrystals. Investigation of the excitation energy dependence shows that hot carriers created by a photon energy considerably larger than the bandgap induce structural distortions at nanocrystal surfaces on few picosecond timescales associated with the localization of trapped holes. On the other hand, carriers created by a photon energy close to the bandgap result in transient lattice heating that occurs on a much longer 200 ps timescale, governed by an Auger heating mechanism. Elucidation of the structural deformations associated with the surface trapping of hot holes provides atomic-scale insights into the mechanisms deteriorating optoelectronic performance and a pathway towards minimizing these losses in nanocrystal devices. Comment: 17 pages, 4 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1038/s41467-021-22116-0 |
| URL الوصول: | http://arxiv.org/abs/2101.01586 |
| رقم الأكسشن: | edsarx.2101.01586 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1038/s41467-021-22116-0 |
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