Sevan Gharabeiki
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View article: Sodium Induced Beneficial Effects in Wide Bandgap Cu(In,Ga)S <sub>2</sub> Solar Cell With 15.7% Efficiency
Sodium Induced Beneficial Effects in Wide Bandgap Cu(In,Ga)S <sub>2</sub> Solar Cell With 15.7% Efficiency Open
This study underscores the pivotal role of sodium (Na) supply in optimizing the optoelectronic properties of wide bandgap (~1.6 eV) Cu(In,Ga)S 2 (CIGS) thin‐film absorbers for high‐efficiency solar cells. Our findings demonstrate that the …
View article: Enhancing photocurrent collection in wide-gap ACIGS solar cells
Enhancing photocurrent collection in wide-gap ACIGS solar cells Open
Chalcopyrite solar cells utilising (Ag,Cu)(In,Ga)Se 2 (ACIGS) absorbers have demonstrated cell efficiencies approaching 24% and adjustable band gaps between 1.0 and 1.7 eV, rendering them a promising material for tandem solar cells. The in…
View article: Sodium induced beneficial effects in wide bandgap Cu(In,Ga)S2 solar cell with 15.7% efficiency
Sodium induced beneficial effects in wide bandgap Cu(In,Ga)S2 solar cell with 15.7% efficiency Open
This study underscores the pivotal role of sodium (Na) supply in optimizing the optoelectronic properties of wide bandgap (~1.6 eV) Cu(In,Ga)S2 (CIGS) thin film absorbers for high efficiency solar cells. Our findings demonstrate that the s…
View article: Impact of Minimal Silver Incorporation on Chalcopyrite Absorbers—Origins for Improved Open‐Circuit Voltages in (Ag,Cu)(In,Ga)Se<sub>2</sub> Solar Cells
Impact of Minimal Silver Incorporation on Chalcopyrite Absorbers—Origins for Improved Open‐Circuit Voltages in (Ag,Cu)(In,Ga)Se<sub>2</sub> Solar Cells Open
The influence of minimal amounts of Ag (0.5–1.4 at%) on elemental distribution and crystalline quality of (Ag,Cu)(In,Ga)Se 2 (ACIGSe) absorbers grown by the three‐stage coevaporation without added alkali elements is reported. The elemental…
View article: Impact of processing atmosphere on nanoscale properties of highly efficient Cs<sub>0.05</sub>MA<sub>0.05</sub>FA<sub>0.9</sub>PbI<sub>3</sub> perovskite solar cells
Impact of processing atmosphere on nanoscale properties of highly efficient Cs<sub>0.05</sub>MA<sub>0.05</sub>FA<sub>0.9</sub>PbI<sub>3</sub> perovskite solar cells Open
The fabrication process of triple-cation-halide organic inorganic perovskites in different annealing atmospheres change the amount of PbI 2 on the surface, which impacts the optoelectronic properties of the absorbers and of the solar cell …
View article: Arbitrary and active colouring of solar cells with negligible loss of efficiency
Arbitrary and active colouring of solar cells with negligible loss of efficiency Open
Self-assembled cholesteric liquid crystals uniquely enable non-spectral coloured and thermochromic covered highly efficient photovoltaic devices for aesthetic integration.
View article: Grain boundaries are not the source of Urbach tails in Cu(In,Ga)Se<sub>2</sub> absorbers
Grain boundaries are not the source of Urbach tails in Cu(In,Ga)Se<sub>2</sub> absorbers Open
The presence of Urbach tails in Cu(In,Ga)Se 2 (CIGSe) absorbers has been identified as a limiting factor for the performance of the CIGSe solar cells. The tail states contribute to both radiative and non-radiative recombination processes, …
View article: Shifting the Paradigm: A Functional Hole‐Selective Transport Layer for Chalcopyrite Solar Cells
Shifting the Paradigm: A Functional Hole‐Selective Transport Layer for Chalcopyrite Solar Cells Open
High‐efficiency Cu(In,Ga)Se 2 solar cells rely on Ga grading to mitigate back surface recombination. However, the inhomogeneous absorber has drawbacks, including increased non‐radiative loss and inadequate absorption. Therefore, literature…
View article: Quantifying recombination and charge carrier extraction in halide perovskites via hyperspectral time-resolved photoluminescence imaging
Quantifying recombination and charge carrier extraction in halide perovskites via hyperspectral time-resolved photoluminescence imaging Open
Identifying sources of nonradiative recombination and quantifying charge carrier extraction in halide perovskite solar cells are important in further developing this thin-film technology. Steady-state and time-resolved photoluminescence (T…
View article: Vacuum‐Healing of Grain Boundaries in Sodium‐Doped CuInSe<sub>2</sub> Solar Cell Absorbers
Vacuum‐Healing of Grain Boundaries in Sodium‐Doped CuInSe<sub>2</sub> Solar Cell Absorbers Open
Alkali metal doping and grain boundaries (GB) have been at the center of attention within the Cu(In,Ga)(S,Se) 2 photovoltaics community for years. This study provides the first experimental evidence that the GB of sodium‐doped CuInSe 2 thi…
View article: Coevaporation Stabilizes Tin-Based Perovskites in a Single Sn-Oxidation State
Coevaporation Stabilizes Tin-Based Perovskites in a Single Sn-Oxidation State Open
Chemically processed methylammonium tin-triiodide (CH3NH3SnI3) films include Sn in different oxidation states, leading to poor stability and low power conversion efficiency of the resulting solar cells (PSCs). The development of absorbers …
View article: Sn4+-free, stable tin perovskite films for lead-free perovskite solar cells
Sn4+-free, stable tin perovskite films for lead-free perovskite solar cells Open
peer reviewed
View article: Photoluminescence assessment of materials for solar cell absorbers
Photoluminescence assessment of materials for solar cell absorbers Open
Photoluminescence is used to predict the open circuit voltage. However, band gap fluctuations and tail states broaden the PL emission and can lead to underestimation of the quasi Fermi level splitting. We discuss potential errors and how t…