Taowen Wang
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View article: Effect of a Band-Gap Gradient on the Radiative Losses in the Open-Circuit Voltage of Solar Cells
Effect of a Band-Gap Gradient on the Radiative Losses in the Open-Circuit Voltage of Solar Cells Open
The radiative open-circuit voltage loss in a solar cell occurs because the absorptance spectrum near the band gap shows a gradual increase rather than a sharp step-function-like transition. This broadening effect has been attributed to ban…
View article: Sub-micron Cu(In,Ga)Se <sub>2</sub> solar cells with an efficiency of 18.2% enabled by a hole transport layer
Sub-micron Cu(In,Ga)Se <sub>2</sub> solar cells with an efficiency of 18.2% enabled by a hole transport layer Open
A stable and effective HTL leads to a record efficiency of 18.2% for ultra-thin (750 nm) CIGS solar cells.
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: On the Origin of Tail States and Open Circuit Voltage Losses in Cu(In,Ga)Se<sub>2</sub>
On the Origin of Tail States and Open Circuit Voltage Losses in Cu(In,Ga)Se<sub>2</sub> Open
The detrimental effect of tail states on the radiative and non‐radiative voltage loss has been demonstrated to be a limiting factor for the open circuit voltage ( V OC ) in Cu(In,Ga)Se 2 solar cells. A strategy that has proven effective in…
View article: On the origin of tail states and VOC losses in Cu(In,Ga)Se2
On the origin of tail states and VOC losses in Cu(In,Ga)Se2 Open
The detrimental effect of tail states on the radiative and non-radiative voltage loss has been demonstrated to be a limiting factor for the open circuit voltage in Cu(In,Ga)Se2 solar cells. A strategy that has proven effective in reducing …
View article: Urbach energy in CIGSe from PL
Urbach energy in CIGSe from PL Open
Data of the manuscript "On the origin of tail states and VOC losses in Cu(In,Ga)Se2".
View article: Urbach energy in CIGSe from PL
Urbach energy in CIGSe from PL Open
Data of the manuscript "On the origin of tail states and VOC losses in Cu(In,Ga)Se2".
View article: Diode Factor in Solar Cells with Metastable Defects and Back Contact Recombination
Diode Factor in Solar Cells with Metastable Defects and Back Contact Recombination Open
To achieve a high fill factor, a small diode factor close to 1 is essential. The optical diode factor determined by photoluminescence is the diode factor from the neutral zone of the solar cell and thus a lower bound for the diode factor. …
View article: High-resolution XEOL spectroscopy setup at the X-ray absorption spectroscopy beamline P65 of PETRA III
High-resolution XEOL spectroscopy setup at the X-ray absorption spectroscopy beamline P65 of PETRA III Open
A newly designed setup to perform steady-state X-ray excited optical luminescence (XEOL) spectroscopy and simultaneous XEOL and X-ray absorption spectroscopy characterization at beamline P65 of PETRA III is described. The XEOL setup is equ…
View article: Solar cell efficiency, diode factor and interface recombination: insights from photoluminescence
Solar cell efficiency, diode factor and interface recombination: insights from photoluminescence Open
Metastable defects can decisively influence the diode factor and thus the efficiency of a solar cell. The diode factor is also influenced by the doping level and the recombination mechanisms in the solar cell. Here we quantify how the vari…
View article: Solar cell efficiency, diode factor and interface recombination: insights from photoluminescence
Solar cell efficiency, diode factor and interface recombination: insights from photoluminescence Open
ABSTRACT Metastable defects can decisively influence the diode factor and thus the efficiency of a solar cell. The diode factor is also influenced by the doping level and the recombination mechanisms in the solar cell. Her…
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…
View article: Understanding Performance Limitations of Cu(In,Ga)Se<sub>2</sub> Solar Cells due to Metastable Defects—A Route toward Higher Efficiencies
Understanding Performance Limitations of Cu(In,Ga)Se<sub>2</sub> Solar Cells due to Metastable Defects—A Route toward Higher Efficiencies Open
Thin‐film Cu(In,Ga)Se 2 solar cells reach power conversion efficiencies exceeding 23% and nonradiative recombination in the bulk is reported to limit device performance. The diode factor has not received much attention, although it limits …