000			03390cam a2200349 a 4500
003			EG-GiCUC
005			20250223031959.0
008			180424s2016 ua dh f m 000 0 eng d
040			_aEG-GiCUC _beng _cEG-GiCUC
041	0		_aeng
049			_aDeposite
097			_aM.Sc
099			_aCai01.24.05.M.Sc.2016.Sa.O
100	0		_aSamar Saeed Mahmoud Abdou
245	1	0	_aOptimization of quantum dots photoelectric conversion using up-converting nanoparticles, IR laser and visible light / _cSamar Saeed Mahmoud Abdou ; Supervised Tareq Youssef , Souad Elfeky , Farag Eltalabawy
246	1	5	_aتعظيم الاستفادة من التحويل الكهروضوئي لنقاط الكم باستخدام جسيمات التحويل العلوي النانوية وليزر الاشعة تحت الحمراء والضوء المرئي
260			_aCairo : _bSamar Saeed Mahmoud Abdou , _c2016
300			_a116 P. : _bcharts , facsimiles ; _c25cm
502			_aThesis (M.Sc.) - Cairo University - National Institute of Laser Enhanced Sciences - Department of Laser Applications Invironmental Metrology, Photochemistry and Agriculture
520			_aMost materials frequently used for photovoltaic applications absorb only photons with energy in the UV/VIS regions. Rare-earth up-conversion materials (UC), which convert long wavelength near-infrared (NIR) photons into shorter wavelength visible photons, have been enticing great acuity in various fields including bio-imaging and photovoltaic applications etc. This research aims to integrate UCNPs (NaYF₄:Yb³⁺/Er³⁺) with the CdTe quantum dots (QDs) to create a model system for optimized QDs solar cell (QDSSC) in which the QDs can absorb the emitted photons from UCNPs for effective utilization of energy in the NIR region. Therefore high electrical current can be obtained. In this work NaYF₄:Yb³⁺/Er³⁺ UCNPs and CdTe (QDs) nanoparticles were prepared for solar cell construction. Hexagonal UCNPs of Ý-NaYF4 co-doped with NaYF₄:Yb³⁺/Er³⁺was directly synthesized via thermal decomposition of metals trifluoroacetate precursors. CdTe QDs were prepared by the organometallic method. The prepared nanomaterials were identified and described by XRD, TEM, Absorption and fluorescence spectroscopy. TEM and XRD revealed that the UC nanocrystals were hexagonal with a size range of around 30 nm. The absorption spectrum clarified the presence of one band at nmax= 980 nm while fluorescence spectrum illustrated the presence of three characteristic emission peaks for UCNPs at nmax= 539 nm, 548 nm and 658 nm. On the other hand, the CdTe QDs size was in the range of 4±0.2 nm with a spherical shape as observed by TEM. Whereas CdTe nanocrystals were cubic as confirmed by XRD. Furthermore, CdTe QDs had a broad absorption band at nmax=535-600 nm and a sharp emission peak at nmax= 621 nm. The prepared nanomaterials were assembled in the photoelectrode of the QDSSC sandwich structure
530			_aIssued also as CD
653		4	_aConverting nanoparticles
653		4	_aIR laser and Visible ligh
653		4	_aPhotoelectric conversion
700	0		_aFarag Eltalabawy , _eSupervisor
700	0		_aSouad Elfeky , _eSupervisor
700	0		_aTareq Youssef , _eSupervisor
856			_uhttp://172.23.153.220/th.pdf
905			_aNazla _eRevisor
905			_aShimaa _eCataloger
942			_2ddc _cTH
999			_c65980 _d65980