S-shaped current-voltage characteristics of organic solar devices

Abstract

Measuring the current-voltage characteristic of organic bulk heterojunction solar devices sometimes reveals an s-shaped deformation. We qualitatively produce this behaviour by a numerical device simulation assuming a reduced surface recombination. Furthermore we show how to experimentally create these double diodes by applying an oxygen plasma etch on the indium tin oxide (ITO) anode. Restricted charge transport over material interfaces accumulates space charges and therefore creates s-shaped deformations. Finally we discuss the consequences of our findings for the open circuit voltage $V_{oc}$

9 pages, 7 figures

References in corpus (4)

• Origin of Reduced Polaron Recombination in Organic Semiconductor Devices
• Coupled opto-electronic simulation of organic bulk-heterojunction solar cells: parameter extraction and sensitivity analysis
• Influence of Charge Carrier Mobility on the Performance of Organic Solar Cells
• Bipolar Charge Transport in Poly(3-hexyl thiophene)/Methanofullerene Blends: A Ratio Dependent Study

Cited by in corpus (15)

• Oxygen doping of P3HT:PCBM blends: Influence on trap states, charge carrier mobility and solar cell performance
• Effect of doping on performance of organic solar cells
• Organic solar cell efficiencies under the aspect of reduced surface recombination velocities
• Role of Oxygen Adsorption in Nanocrystalline ZnO Interfacial Layers for Polymer-Fullerene Bulk Heterojunction Solar Cells
• Traps and transport resistance: the next frontier for stable state-of-the-art non-fullerene acceptor solar cells
• Nongeminate Recombination in Planar and Bulk Heterojunction Organic Solar Cells
• Comment on "Interface state recombination in organic solar cells"
• Semitransparent Polymer-Based Solar Cells with Aluminum-Doped Zinc Oxide Electrodes
• Impact of a doping-induced space-charge region on the collection of photo-generated charge carriers in thin-film solar cells based on low-mobility semiconductors
• Influence of Perfluorinated Ionomer in PEDOT:PSS on the Rectification and Degradation of Organic Photovoltaic Cells
• Effect of Imbalanced Charge Transport on the Interplay of Surface and Bulk Recombination in Organic Solar Cells
• Direct quantification of quasi-Fermi level splitting in organic semiconductor devices
• Distribution of charge carrier transport properties in organic semiconductors with Gaussian disorder
• Organic photovoltaic bulk heterojunctions with spatially varying composition
• A Framework to Pinpoint Bottlenecks in Emerging Solar Cells and Disordered Devices via Differential Machine Learning