Ultrafast Dynamics in Molecules, Nanostructures and Interfaces Selected Lectures Presented at Symposium on Ultrafast Dynamics of the 7th International Conference on Materials for Advanced Technologies.
Title:
Ultrafast Dynamics in Molecules, Nanostructures and Interfaces Selected Lectures Presented at Symposium on Ultrafast Dynamics of the 7th International Conference on Materials for Advanced Technologies.
Author:
Gurzadyan, G. G.
ISBN:
9789814556927
Personal Author:
Publication Information:
Singapore : World Scientific Publishing Company, 2014.
Physical Description:
1 online resource (304 pages).
Series:
Series in Optics and Photonics
Series in optics and photonics.
General Note:
6. Ultrafast Optical Probing of Carrier Motion in Conjugated Polymers and Blends for Solar Cells.
Contents:
Preface; 1. Femtosecond Real-Time Vibrational Spectroscopy Using Ultrafast Laser Pulses; 1. Introduction; 2. Femtosecond Pump Probe Experimental Setup Based on NOPA; 2.1. Development of Ultrashort Laser Pulse; 2.2. Development of a Broadband Detector; 2.3. Advantages of Femtosecond Real-time Vibrational Spectroscopy; 3. Principle of Real-time Vibration Spectroscopy: Modulation of Electronic Transition Probability by Wave-Packet Motion; 3.1. The Case of Condon Approximation Satisfied; 3.2. Cases in which the Condon Approximation is Unsatisfied.
4. Examples of Real-Time Spectroscopy Applications4.1. Ultrafast Electronic Relaxation and Vibrational Dynamics in a Polyacetylene Derivative; 4.2. Observation of Breather and Soliton in a Substituted Polythiophene; 5. Summary and Future Prospects; Acknowledgments; References; 2. Multidimensional Optical Spectroscopy Using a Pump-Probe Configuration: Some Implementation Details; 1. Introduction; 2. Some Experimental Details; 3. Conclusions; Acknowledgments; References; 3. High-Sensitivity Ultrafast Transient Absorption Spectroscopy of Organic Photovoltaic Devices; 1. Introduction.
2. Experimental Details2.1. Excitation light sources and pulse timing; 2.2. Probe light sources; 2.3. Light detection; 2.4. System automation; 2.4.1. Noise reduction during data collection; 2.4.2. Noise reduction after measurement: Data processing; 2.5. Measuring beam profiles; 3. Case Studies; 3.1. Ultra-sensitive studies of charge photo-generation in P3HT: PCBM thin film blends; 3.2. Temperature and excitation-density dependent charge recombination in P3HT-PCBM blends; 3.3. Probe saturation and observation of higher order perturbations; 4. Conclusions; References.
4. Transient Absorption Data Analysis by Soft-Modelling1. Introduction; 2. Global analysis; 2.1. Global analysis applied to a simple example; 3. Multivariate curve resolution; 3.1. Initial guess; 3.2. Optimization process; 3.3. Data augmentation; 3.4. Exploring the linear transformation ambiguity; 3.4.1. Linear transformation with two populations; 3.5. MCR applied to a simple example; 3.6. General conclusions regarding hard and soft modelling; 4. Demonstrations of soft-modelling applied to the analysis of transient absorption surfaces of organic solar cells.
4.1. Separating exciton and charge dynamics during charge generation4.1.1. Absorption and devices; 4.1.2. Transient absorption data and MCR analysis; 4.1.3. Linear transformation ambiguity and summary; 4.2. Analysing triplet formation mechanisms, specifically the role of nongeminate recombination; 5. Conclusion; Acknowledgment; References; 5. Infrared Ultrafast Optical Probes of Photoexcitations in -Conjugated Polymers/Fullerene Blends for Photovoltaic Applications; 1. Introduction; 2. Experimental; 3. Results and discussion; 4. Conclusions; Acknowledgments; References.
Abstract:
Primary events in natural systems or devices occur on extremely short time scales, and yet determine in many cases the final performance or output. For this reason research in ultrafast science is of primary importance and impact in both fundamental research as well as its applications. This book reviews the advances in the field, addressing timely and open questions such as the role of quantum coherence in biology, the role of excess energy in electron injection at photovoltaic interfaces or the dynamics in quantum confined structures (e.g. multi carrier generation). The approach is that of a.
Electronic Access:
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