Browsing by Author "Cihan, A. F."

Attractive versus repulsive excitonic interactions of colloidal quantum dots control blue-to red-shifting (and non-shifting) amplified spontaneous emission

Cihan, A. F.; Kelestemur, Y.; Guzelturk, B.; Yerli, O.; Kurum, U.; Yaglioglu, H. G.; Elmali, A.; Demir, Hilmi Volkan (American Chemical Society, 2013-11-21)

Tunable, high-performance, two-photon absorption (TPA)-based amplified spontaneous emission (ASE) from near-unity quantum efficiency colloidal quantum dots (CQDs) is reported. Besides the absolute spectral tuning of ASE, ...

Multiexciton generation assisted highly photosensitive CdHgTe nanocrystal skins

Akhavan S.; Cihan, A. F.; Yeltik A.; Bozok, B.; Lesnyak, V.; Gaponik N.; Eychmüller A.; Demir, Hilmi Volkan (Elsevier Ltd, 2016)

Multiexciton Generation (MEG) enabled by the photogeneration of more than one electron-hole pairs upon the absorption of a single photon observed in colloidal semiconductor nanocrystals (NCs) is an essential key to high ...

Nanocrystal skins with exciton funneling for photosensing

Akhavan, S.; Cihan, A. F.; Bozok, B.; Demir, Hilmi Volkan (Wiley-VCH Verlag, 2014-03-05)

Highly photosensitive nanocrystal (NC) skins based on exciton funneling are proposed and demonstrated using a graded bandgap profile across which no external bias is applied in operation for light-sensing. Four types of ...

Observation of biexcitons in nanocrystal solids in the presence of photocharging

Cihan, A. F.; Martinez, P. L. H.; Kelestemur Y.; Mutlugun, E.; Demir, Hilmi Volkan (American Chemical Society, 2013)

T In nanocrystal quantum dots (NQDs), generating multiexcitons offers an enabling tool for enhancing NQD-based devices. However, the photocharging effect makes understanding multiexciton kinetics in NQD solids ...

Type-tunable amplified spontaneous emission from core-seeded CdSe/CdS nanorods controlled by exciton-exciton interaction

Kelestemur Y.; Cihan, A. F.; Guzelturk, B.; Demir, Hilmi Volkan (Royal Society of Chemistry, 2014)

Type-tunable optical gain performance of core-seeded CdSe/CdS nanorods is studied via two-photon optical pumping. Controlling the exciton-exciton interaction by varying the core and shell size, blue-shifted and red-shifted ...