Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
Transient photovoltage decay (TPV) along with impedance spectroscopy (EIS) became workhorse techniques for the characterization of recombination kinetics of dye-sensitized solar cells (DSSCs). Their developments as applied research tools occurred alongside the use of the techniques to explain fundamental operating principles of DSSCs. For example, TPV, along with charge extraction and current transient measurements is able to distinguish between a conduction band shift and a change in the DOS when one observes a difference in voltage between individual devices [1]. With the advent of solid state perovskite photovoltaics (PSCs), it was natural therefore, for researchers using TPV to apply the technique to try and understand recombination mechanisms in PSCs. It soon became apparent that PCSs behave very differently from DSSCs, TPV data often shows multi-exponential decays with resultant multiple time-constants; charge extraction experiments show apparent charge being collected ca. 1 minute after switching off the bias light. It is highly likely that these phenomena are linked to the hysteresis observed in PSC IV-scans, but a complete explanation of observed results, to the extent of the understanding of DSSCs, is yet to be realised. Nonetheless, TPV data obtained in a variety of studies at SPECIFIC – Swansea University, has been successfully utilised to gain an insight into changes in recombination kinetics, when materials and processing conditions are modified. This presentation will give examples of a number instances, such as ultra-fast perovskite processing and PSC devices built on metal foils, where TPV has been utilised in applied research to diagnose or explain device behaviour and how it has deepened our understanding of how materials and processing conditions can influence device behaviour.
1. Piers R. F. Barnes et al, Interpretation of Optoelectronic Transient and Charge Extraction Measurements in Dye-Sensitized Solar Cells, Adv. Mater., 25: 1881–1922.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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