235 citations · 697 across the 17 of their papers we have counts for
17 papers
Capacitance of Undoped Thin-Film Diodes
Oskar J. Sandberg, Mathias Nyman, Stefan Zeiske +3
The capacitance of thin-film diodes based on undoped semiconductors are dominated by injected charge carriers rather than doping-induced carriers. However, an analytical framework…
What Photocurrent Versus Effective Voltage Tells Us About Charge Generation in Organic Solar Cells
Ardalan Armin, Austin M. Kay, Drew B. Riley +2
The photocurrent of an organic solar cell is routinely plotted against an effective voltage and used to extract an exciton dissociation probability, and through it a free-charge ge…
Limits of Trap-assisted Photomultiplication Gain
Ardalan Armin
Photodiodes based on trap-assisted current injection can exhibit internal photomultiplication with apparent quantum efficiencies far exceeding unity, raising the question of whethe…
Roadmap on Photovoltaic Absorber Materials for Sustainable Energy Conversion
James C. Blakesley, Ruy S. Bonilla, Marina Freitag +83
Photovoltaics (PVs) are a critical technology for curbing growing levels of anthropogenic greenhouse gas emissions, and meeting increases in future demand for low-carbon electricit…
A Unified Diode Equation for Organic Photovoltaic Devices
Oskar J Sandberg, Ardalan Armin
Organic photovoltaics (OPVs) are promising candidates for future sustainable technologies, including applications within the renewable energy sector, such as solar cells and indoor…
The Thermodynamic Limit of Indoor Photovoltaics Based on Energetically-Disordered Molecular Semiconductors
Austin M. Kay, Maura E. Fitzsimons, Gregory Burwell +3
Due to their tailorable optical properties, organic semiconductors show considerable promise for use in indoor photovoltaics (IPVs), which present a sustainable route for powering…
Quantifying the Excitonic Static Disorder in Organic Semiconductors
Austin M. Kay, Oskar J. Sandberg, Nasim Zarrabi +5
Organic semiconductors are disordered molecular solids and as a result, their internal charge dynamics and ultimately, the performance of the optoelectronic devices they constitute…
Quantum trajectories, interference, and state localisation in dephasing assisted quantum transport
Kiran E. Khosla, Ardalan Armin, M. S. Kim
Dephased quantum transport of excitations occurs when energetic fluctuations in a system are sufficient to suppress the built-up of coherent amplitudes. While this has been extensi…
A quasi steady-state measurement of exciton diffusion lengths in organic semiconductors
Drew B. Riley, Oskar J. Sandberg, Wei Li +2
Understanding the role that exciton diffusion plays in organic solar cells is a crucial to understanding the recent rise in power conversion effciencies brought about by non-fuller…
Energetics and Kinetics Requirements for Organic Solar Cells to 2 Break the 20% Power Conversion Efficiency Barrier
Oskar J Sandberg, Ardalan Armin
The thermodynamic limit for the efficiency of solar cells is predominantly defined by the energy bandgap of the used semiconductor. In case of organic solar cells both energetics a…
Direct quantification of quasi-Fermi level splitting in organic semiconductor devices
Drew B. Riley, Oskar J. Sandberg, Nora M. Wilson +6
Non-radiative losses to the open-circuit voltage are a primary factor in limiting the power conversion efficiency of organic photovoltaic devices. The dominant non-radiative loss i…
A Universal Urbach Rule for Disordered Organic Semiconductors
Christina Kaiser, Oskar J. Sandberg, Nasim Zarrabi +3
In crystalline semiconductors, absorption onset sharpness is characterized by temperature dependent Urbach energies. These energies quantify the static, structural disorder causing…
Determining Ultra-low Absorption Coefficients of Organic Semiconductors from the Sub-bandgap Photovoltaic External Quantum Efficiency
Christina Kaiser, Stefan Zeiske, Paul Meredith +1
Energy states below the bandgap of a semiconductor, such as trap states or charge transfer states in organic donor acceptor blends, can contribute to light absorption. Due to their…
A Theoretical Perspective on Transient Photovoltage and Charge Extraction Techniques
Oskar J. Sandberg, Kristofer Tvingstedt, Paul Meredith +1
Transient photovoltage (TPV) is a technique frequently used to determine charge carrier lifetimes in thin-film solar cells such as organic, dye sensitized and perovskite solar cell…
On the effect of surface recombination in thin film solar cells, light emitting diodes and photodetectors
Oskar J. Sandberg, Ardalan Armin
Radiative and non-radiative charge carrier recombination in thin-film diodes plays a key role in determining the efficiency of electronic devices made of next generation semiconduc…
Precision ultrasound sensing on a chip
Sahar Basiri-Esfahani, Ardalan Armin, Stefan Forstner +1
Ultrasound sensors have wide applications across science and technology. However, improved sensitivity is required for both miniaturisation and increased spatial resolution. Here,…
An integrated quantum photonic sensor based on Hong-Ou-Mandel interference
Sahar Basiri-Esfahani, Casey R. Myers, Ardalan Armin +2
Photonic-crystal-based integrated optical systems have been used for a broad range of sensing applications with great success. This has been motivated by several advantages such as…