Benjamin Bissig
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How band tail recombination influences the open‐circuit voltage of solar cells Open
The power conversion efficiency of solar cells strongly depends on the open‐circuit voltage which, in turn, depends on the recombination activity within the device. A possible source of detrimental charge carrier recombination is band tail…
The use of HfO2 in a point contact concept for front interface passivation of Cu(In,Ga)Se2 solar cells Open
We report on the use of a high bandgap metal-oxide at the front interface of Cu(In,Ga)Se-2 (CIGS) solar cells in a point contact concept for reduced interface recombination. Highly resistive HfO2 is applied on the CIGS surface by atomic la…
Influence of Sodium and Rubidium Postdeposition Treatment on the Quasi-Fermi Level Splitting of Cu(In,Ga)Se<sub>2</sub>Thin Films Open
The influence of sodium and rubidium postdeposition treatment on the quality of Cu(In,Ga)Se2 thin-film absorbers is investigated. The quasi-Fermi level splitting (QFLS), measured via photoluminescence (PL), is used as the metric of quality…
Novel back contact reflector for high efficiency and double‐graded Cu(In,Ga)Se<sub>2</sub> thin‐film solar cells Open
For highest efficiency Cu(In,Ga)Se 2 thin‐film solar cells, the V‐shaped bandgap grading can result in residual transmission through the absorber layer and parasitic absorbance in the Mo back contact. To improve the back contact reflectanc…
Refractive indices of layers and optical simulations of Cu(In,Ga)Se<sub>2</sub> solar cells Open
Cu(In,Ga)Se2 based solar cells have reached efficiencies close to 23%. Further knowledge-driven improvements require accurate determination of the material properties. Here, we present refractive indices for all layers in Cu(In,Ga)Se2 sola…
Single-graded CIGS with narrow bandgap for tandem solar cells Open
Multi-junction solar cells show the highest photovoltaic energy conversion efficiencies, but the current technologies based on wafers and epitaxial growth of multiple layers are very costly. Therefore, there is a high interest in realizing…
Single-graded CIGS with narrow bandgap for tandem solar cells Open
Multi-junction solar cells show the highest photovoltaic energy conversion efficiencies, but the current technologies based on wafers and epitaxial growth of multiple layers are very costly. Therefore, there is a high interest in realizing…
Refractive indices of layers and optical simulations of Cu(In,Ga)Se<sub>2</sub> solar cells Open
Cu(In,Ga)Se2 -based solar cells have reached efficiencies close to 23%. Further knowledge-driven improvements require accurate determination of the material properties. Here, we present refractive indices for all layers in Cu(In,Ga)Se2 sol…
Injection Current Barrier Formation for RbF Postdeposition‐Treated Cu(In,Ga)Se<sub>2</sub>‐Based Solar Cells Open
Among the thin‐film solar cell technologies, Cu(In,Ga)Se 2 ‐based solar cells demonstrate the highest efficiencies, where the recent boost in efficiency is triggered by a KF postdeposition treatment (PDT). In this contribution, Cu(In,Ga)Se…
TiO2 as intermediate buffer layer in Cu(In,Ga)Se2 solar cells Open
The application of TiO2 as part of the buffer layer stack in thin film Cu(In,Ga)Se2 (CIGS) solar cells is investigated for the improvement of the photovoltaic device performance. In a standard device configuration a CdS/ZnO/Al:ZnO layer st…
Impact of front-side point contact/passivation geometry on thin-film solar cell performance Open
In this work, we perform an extensive campaign of three-dimensional numerical simulations of CIGS solar cell structures to investigate the effect of a surface-passivated CIGS with point contacts openings on the cell performance parameters …
Correcting for interference effects in the photoluminescence of Cu(In,Ga)Se<sub>2</sub> thin films Open
Photoluminescence (PL) measurements are performed on high‐quality Cu(In,Ga)Se 2 (CIGS) thin films with the intention of investigating their electronic structure. Due to the nature of the CIGS absorbers, notably their smooth surface and a g…
Voltage dependent admittance spectroscopy for the detection of near interface defect states for thin film solar cells Open
Deep acceptor states at the Cu(In,Ga)Se2/CdS interface were detected by voltage dependent admittance spectroscopy for state of the art low temperature processed chalcopyrite solar cells.
Energy Harvesting by Subcutaneous Solar Cells: A Long-Term Study on Achievable Energy Output Open
Active electronic implants are powered by primary batteries, which induces the necessity of implant replacement after battery depletion. This causes repeated interventions in a patients' life, which bears the risk of complications and is c…
Combining <span>TEM</span> and <span>APT</span> for a better understanding of super high efficiency Cu(In,Ga)Se2 thin film solar cells Open
The Sharc25 EU H2020 project aim is to push the efficiency of Cu(In,Ga)Se2 (CIGS) thin film solar cells to their maximum theoretical limit. Sharc25 consists in a large consortium to take under consideration both theoretical and experimenta…
Impact of compositional grading and overall Cu deficiency on the near-infrared response in Cu(In, Ga)Se2 solar cells Open
Highly efficient thin film solar cells based on co-evaporated Cu(In,Ga)Se2 (CIGS) absorbers are typically grown with a [Ga]/([Ga] + [In]) (GGI) gradient across the thickness and a Cu-poor composition. Upon increasing the Cu content towards…
Band gap widening at random CIGS grain boundary detected by valence electron energy loss spectroscopy Open
Cu(In,Ga) Se2 (CIGS) thin film solar cells have demonstrated very high efficiencies, but still the role of nanoscale inhomogeneities in CIGS and their impact on the solar cell performance are not yet clearly understood. Due to the polycrys…