972 citations · 1.6k across the 26 of their papers we have counts for
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Characterizing Fill Factor Limitations in Perovskite-Silicon Tandem Solar Cells
Yueming Wang, Nan Sun, Chris Dreessen +4
Perovskite-silicon tandem technology has exceeded the single junction theoretical efficiency limit. However, there is still distance to the thermodynamic limit mainly caused by the…
Understanding the fill-factor limit of organic solar cells
Huotian Zhang, Jun Yuan, Tong Wang +14
Although the power conversion efficiencies of organic solar cells (OSCs) have surpassed 20%, they still lag behind commercial inorganic solar cells and emerging perovskite solar ce…
Determination of Electron Extraction in Semiconductor Photoanodes: Steady-state and Small-perturbation Response
Paola Ragonese, Chiara Maurizio, Boris Kalinic +2
This work develops an analytical model to consistently interpret the steady-state and small-perturbation response (both in the time and frequency domain) of photoanodes for solar w…
Transport resistance dominates the fill factor losses in record organic solar cells
Chen Wang, Roderick C. I. MacKenzie, Uli Würfel +4
Organic photovoltaics are a promising solar cell technology well-suited to mass production using roll-to-roll processes. The efficiency of lab-scale solar cells has exceeded 20% an…
Deriving mobility-lifetime products in halide perovskite films from spectrally- and time-resolved photoluminescence
Ye Yuan, Genghua Yan, Samah Akel +2
Lead-halide perovskites are semiconductor materials with attractive properties for photovoltaic and other optoelectronic applications. However, determining crucial electronic mater…
Resolving the Hydrophobicity of Me-4PACz Hole Transport Layer for High-Efficiency Inverted Perovskite Solar Cells
Kashimul Hossain, Ashish Kulkarni, Urvashi Bothra +4
[4-(3,6-dimethyl-9H-carbazole-9-yl)butyl]phosphonic acid (Me-4PACz) self-assembled monolayer (SAM) has been employed in perovskite single junction and tandem devices demonstrating…
How Charge Carrier Exchange between Absorber and Contact influences Time Constants in the Frequency Domain Response of Perovskite Solar Cells
Sandheep Ravishankar, Zhifa Liu, Yueming Wang +2
A model is derived for the frequency- and time-domain opto-electronic response of perovskite solar cells (PSCs) that emphasizes the role of charge carrier exchange, .i.e. extractio…
Characterizing the Influence of Charge Extraction Layers on the Performance of Triple-Cation Perovskite Solar Cells
Johanna Siekmann, Ashish Kulkarni, Samah Akel +4
Selecting suitable charge transport layers and suppressing non-radiative recombination at interfaces to the absorber layer are vital to maximize the efficiency of halide perovskite…
Quantifying Charge Extraction and Recombination Using the Rise and Decay of the Transient Photovoltage of Perovskite Solar Cells
Lisa Krückemeier, Zhifa Liu, Thomas Kirchartz +1
The extraction of photogenerated charge carriers and the generation of a photovoltage belong to the fundamental functionalities of any solar cell. These processes happen not instan…
Comparing Methods of Characterizing Energetic Disorder in Organic Solar Cells
Paula Hartnagel, Sandheep Ravishankar, Benjamin Klingebiel +2
Energetic disorder has been known for decades to limit the performance of structurally disordered semiconductors such as amorphous silicon and organic semiconductors. However, in t…
Interpretation of Mott-Schottky Plots of Photoanodes for Water Splitting
Sandheep Ravishankar, Juan Bisquert, Thomas Kirchartz
A large body of literature reports that both bismuth vanadate and haematite photoanodes are semiconductors with an extremely high doping density between 10^18-10^21 cm^-3. Such val…
Effect of doping, photodoping and bandgap variation on the performance of perovskite solar cells
Basita Das, Irene Aguilera, Uwe Rau +1
Most traditional semiconductor materials are based on the control of doping densities to create junctions and thereby functional and efficient electronic and optoelectronic devices…
Understanding Transient Photoluminescence in Halide Perovskite Layer Stacks and Solar Cells
Lisa Krückemeier, Benedikt Krogmeier, Zhifa Liu +2
While transient photoluminescence measurements are a very popular tool to monitor the charge-carrier dynamics in the field of halide perovskite photovoltaics, interpretation of dat…
Interface Optimization via Fullerene Blends Enables Open-Circuit Voltages of 1.35 V in CH3NH3Pb(I0.8Br0.2)3 Solar Cells
Zhifa Liu, Johanna Siekmann, Benjamin Klingebiel +2
Non-radiative recombination processes are the biggest hindrance to approaching the radiative limit of the open-circuit voltage for wide-band gap perovskite solar cells. In addition…
Defect tolerant device geometries
Basita Das, Zhifa Liu, Irene Aguilera +2
The term defect tolerance is widely used in literature to describe materials such as lead-halides which exhibit long non-radiative lifetimes of carriers despite possessing a large…
Pathways towards 30% efficient single-junction perovskite solar cells and the role of mobile ions
Jonas Diekmann, Pietro Caprioglio, Moritz H. Futscher +13
Perovskite semiconductors have demonstrated outstanding external luminescence quantum yields, enabling high power conversion efficiencies (PCE). However, the precise conditions to…
Type and Degree of Covalence: Empirical Derivation and Implications
Yevgeny Rakita, Thomas Kirchartz, Gary Hodes +1
The way atoms attach to each other defines the function(s), e.g., mechanical, optical, electronic, of a given material. The nature of the chemical bond is, therefore, one of the mo…
Impact of Small Phonon Energies on the Charge-Carrier Lifetimes in Metal-Halide Perovskites
Thomas Kirchartz, Tom Markvart, Uwe Rau +1
Solar cells based on metal-halide perovskite absorber layers have resulted in outstanding photovoltaic devices with long non-radiative lifetimes as a crucial feature enabling high…