Category: Solar Energy Conversion

Applications of XTA in Solar Energy Conversion Research: Examples

12.3.1 Metalloporphyrin Excited State Structural Dynamics (Homogeneous Electron/Energy Transfer) Metalloporphyrins and derivatives play many important roles in solar energy conversion as light harvesting antennae and electron donors in natural photosynthesis, dye sensitizers in solar cells, photocatalysts for redox reactions, and so on.75 79 Their intense absorption from the я-я* transitions in the solar spectrum enables […]

X-ray Transient Absorption Spectroscopy (XTA): Capabilities and Development

12.2.1 Development of X-ray Transient Absorption Spectroscopy 12.2.1.1 X-ray Absorption Spectroscopy X-ray absorption spectroscopy (XAS), including X-ray absorption near edge structure (XANES) and X-ray absorption fine structure (XAFS), is based on resonant absorption processes resulting from electronic transitions from core levels to vacant orbitals and to the continuum, respectively (Figure 12.1).15 18 XANES measures dipole-mediated […]

X-ray Transient Absorption Spectroscopy for Solar Energy Research

LIN X. CHEN Chemical Sciences and Engineering Division, Argonne National Laboratory, Building 200, 9700 South Cass Avenue, Argonne, Illinois 60439; Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, USA Email: lchen@anl. gov; l-chen@northwestern. edu 12.1 Introduction The amount of energy from sunlight reaching the earth in one hour equals the total amount […]

Exciton Dissociation in Semiconducting Polymers

Organic semiconductors have emerged as potential candidates for use in low – cost electronic devices, including solar cells.135 They are commonly divided into two classes: small molecules that are typically deposited as crystalline material by evaporation and semiconducting organic polymers that are processed in solution. Optically excited excitons in organic semiconductors possess high binding energies […]

Quantum Dot Superlattices

Electronically coupled QD superlattices have been also considered for novel PV applications. Indeed, the best reported photocurrents on QD-based solar cells have been obtained for Schottky cells made of QD solids.129 Also, QD super­lattices have been employed as building blocks for tandem QD-based PV de – vices.62 For all these reasons, it is hence of […]