Charge Carrier Dynamics at Silver Nanocluster-Molecular Acceptor Interfaces

الموضوعات

علوم بحتة وطبيعية

الملخص

A fundamental understanding of interfacial charge transfer at donor-acceptorinterfaces is very crucial as it is considered among the most important dynamicalprocesses for optimizing performance in many light harvesting systems, includingphotovoltaics and photo-catalysis. In general, the photo-generated singlet excitons inphotoactive materials exhibit very short lifetimes because of their dipole-allowed spinradiative decay and short diffusion lengths. In contrast, the radiative decay of tripletexcitons is dipole forbidden; therefore, their lifetimes are considerably longer. Thediscussion in this thesis primarily focuses on the relevant parameters that are involved incharge separation (CS), charge transfer (CT), intersystem crossing (ISC) rate, triplet statelifetime, and carrier recombination (CR) at silver nanocluster (NCs) molecular-acceptorsinterfaces. A combination of steady-state and femto- and nanosecond broadbandtransient absorption spectroscopies were used to investigate the charge carrier dynamicsin various donor-acceptor systems.Additionally, this thesis was prolonged to investigate some important factors thatinfluence the charge carrier dynamics in Ag29 silver NCs donor-acceptor systems, such asthe metal doping and chemical structure of the nanocluster and molecular acceptors.Interestingly, clear correlations between the steady-state measurements and timeresolvedspectroscopy results are found. In the first study, we have investigated theinterfacial charge transfer dynamics in positively charged meso units of 5, 10, 15, 20-tetra (1-methyl-4-pyridino)-porphyrin tetra (p-toluene sulfonate) (TMPyP) and neutral charged 5, 10,15, 20-tetra (4-pyridyl)-porphyrin (TPyP), with negatively charged undoped and gold (Au)-doped silver Ag29 NCs. Moreover, this study showed the impact of Au doping on the chargecarrier dynamics of the system. In the second study, we have investigated the interfacialcharge transfer dynamics in [Pt2 Ag23 Cl7 (PPh3)10] silver NCs doped with platinum (Pt), withneutral charged 5, 10, 15, 20-tetra (4-pyridyl)-porphyrin (TPyP). Here, we evaluated theeffects of Pt (II) doping on the interfacial charge-transfer dynamics between TPyP and silverNCs.

روابط وملفات

التعريف والنوع

رقم الوثيقة

08ede74d-5b1d-4195-8428-beecc3413236

رقم العقد

0

نوع الوسائط

Crawler

نوع المحتوى

الرسائل العلمية

صيغة المصدر

رسائل ماجيستير

نوع الملف

pdf text

أسماء الملفات

1699409_1.pdf

بيانات النشر

ألقاب المؤلفين

[{"name_ar":"عبد الخالق احمد المنسف","title_ar":"اعداد","title_en":"Preparation"},{"name_ar":"عمر محمد","title_ar":"اشراف","title_en":"Supervision"}]

اللغة

English

المصدر والدورية

اسم المصدر

Charge Carrier Dynamics at Silver Nanocluster-Molecular Acceptor Interfaces

المحتوى والصفحات

عدد الصفحات

0

كلمات الباحثين

Change Seperation , Charge Transfer , Donor-Acceptor , Interfaces , Metal Nanocluster

إشراف وإعداد

الإشراف

عمر محمد

الإعداد

عبد الخالق احمد المنسف

الاقتباسات الببليوغرافية