Unconventional thin film photovoltaics Covering both organic materials where recent advances in the understanding of device physics is driving progress and the newly emerging field of mixed halide perovskites which are challenging the efficiencies of conventional thin film PV cells this book provides a balanced overview of the experimental and theoretical aspects of these two classes of solar cell. The book explores both the experimental and theoretical aspects of these solar cell classes. Emphasis is placed on understanding the fundamental physics of the devices. The book also discusses modelling over many length scales from nano to macro. The first book to cover perovskites this is an important reference for industrialists and researchers working in energy technologies and materials Cover; Contents; Preface; Chapter 1 High Efficiency Mesoscopic Organometal Halide Perovskite Solar Cells; 1.1 Introduction; 1.1.1 Emergence and Progress of Perovskite Solar Cells; 1.1.2 Role and Importance of the Organic Cation in Halide Perovskites: Phase Transitions Ferroelectricity and Ion Migration; 1.2 Mesoscopic Perovskite Solar Cells; 1.2.1 Perovskite Dots and Extremely Thin Absorber Layers; 1.2.2 Perovskite Hybrids with Mesoporous and Nanostructured TiO2; 1.3 Summary; Acknowledgments; References 4.4 Micro structure and Optical Properties4.4.1 Bandgap and Photoluminescence; 4.4.2 Electron Hole Screening: Pump Probe Spectroscopy as a Probe; 4.5 Transport Properties; 4.5.1 Carrier Diffusion from Photoluminescence Decays; 4.5.2 Optical Pump Terahertz Probe (OPTP) Experiments; 4.6 Summary and Outlook; Acknowledgments; References; Chapter 5 The Role of Nanostructured Metal Oxides in Hybrid Solar Cells; 5.1 Introduction; 5.2 Fundamentals of Hybrid Solar Cells; 5.3 Transparent Electrodes and Blocking Layers; 5.4 Nanostructured Active Layers; 5.4.1 Physical Structuring Chapter 2 Towards Optimum Solution processed Planar Heterojunction Perovskite Solar Cells2.1 Introduction; 2.2 Towards Optimum Solution processed Cells; 2.2.1 Basic Cell Structure; 2.2.2 Towards 100% Surface Coverage; 2.2.3 Contact Materials; 2.3 Outlook and Conclusions; References; Chapter 3 Characterization of Capacitance Transport and Recombination Parameters in Hybrid Perovskite and Organic Solar Cells; 3.1 Introduction; 3.2 Dielectric Relaxation Impedance and Capacitance Spectroscopy; 3.2.1 General Definitions and Concepts; 3.2.2 Dielectric Relaxation and Frequency Dispersion 3.2.3 The Chemical Capacitance3.2.4 Contact Capacitances; 3.2.5 Recombination Parameters; 3.3 Capacitance in Organic Solar Cells; 3.3.1 Chemical Capacitance; 3.3.2 Mott Schottky Analysis; 3.4 Capacitances in Hybrid Perovskite Solar Cells; 3.4.1 The Density of States; 3.4.2 Bulk Dielectric Constant; 3.4.3 Electronic Contact Capacitance: A Mott Schottky Analysis; 3.4.4 Electrode Capacitance; 3.4.5 Dependence of Capacitance on Illumination; 3.5 Carrier Transport; 3.6 Recombination in Organic Solar Cells; 3.6.1 Recombination Mechanisms; 3.6.2 Determination of Recombination Kinetics 3.7 Recombination in Perovskite Solar Cells3.7.1 Radiative Recombination Coefficient of MAPbI3; 3.7.2 Radiative and Non radiative Recombination in Perovskite Solar Cells; 3.8 Conclusions; Acknowledgments; References; Chapter 4 Photophysics of Hybrid Perovskites; 4.1 Introduction; 4.2 Linear Absorption; 4.2.1 3D Semiconductor Absorption; 4.2.2 Bandgap; 4.2.3 Excitonic Absorption; 4.2.4 The Saha Langmuir Equation; 4.3 Photoluminescence; 4.3.1 Spontaneous Emission; 4.3.2 Shockley Read Hall Recombination; 4.3.3 Auger Recombination; 4.3.4 Model for PL Dynamics in CH3NH3PbI3