Zhengshan J. Yu
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View article: Recycling Silicon Bottom Cells from End-of-Life Perovskite–Silicon Tandem Solar Cells
Recycling Silicon Bottom Cells from End-of-Life Perovskite–Silicon Tandem Solar Cells Open
Perovskite–silicon tandem cells have shown much higher efficiencies than single-junction cells, which promises further reduction of energy cost from photovoltaics. Due to the protection by perovskites, silicon subcells in perovskite–silico…
View article: Reducing sputter induced stress and damage for efficient perovskite/silicon tandem solar cells
Reducing sputter induced stress and damage for efficient perovskite/silicon tandem solar cells Open
The mechanisms of sputter induced stress and damage in perovskite/silicon tandem solar cells were investigated for optimizing buffer layer materials and transparent conductive oxides. A high power conversion efficiency of 26.0% has been ac…
View article: Shunt mitigation toward efficient large-area perovskite-silicon tandem solar cells
Shunt mitigation toward efficient large-area perovskite-silicon tandem solar cells Open
The efficiency of small-area perovskite-silicon tandem solar cells is already above 30%; however, there are few studies about large-area tandem cells. One main challenge for the upscaling of perovskite-silicon tandems is the non-uniformity…
View article: Optical constants of polycrystalline Al0.25Ga0.75P and Al0.9Ga0.1As determined by variable-angle spectroscopic ellipsometry
Optical constants of polycrystalline Al0.25Ga0.75P and Al0.9Ga0.1As determined by variable-angle spectroscopic ellipsometry Open
The optical constants of single-crystal AlxGa1−xP and AlxGa1−xAs have been widely studied at various Al compositions but have not yet been thoroughly investigated as polycrystalline materials. Using variable-angle spectroscopic ellipsometr…
View article: Recycling Silicon Bottom Cells from End-of-Life Perovskite–Silicon Tandem Solar Cells
Recycling Silicon Bottom Cells from End-of-Life Perovskite–Silicon Tandem Solar Cells Open
Perovskite-silicon tandem cells have shown much higher efficiencies than the single junction cells, which promises further reduction of energy cost from photovoltaics. Due to the protection by perovskites, silicon subcells in perovskite-si…
View article: Bifacial all-perovskite tandem solar cells
Bifacial all-perovskite tandem solar cells Open
The efficiency of all-perovskite tandem devices falls far below theoretical efficiency limits, mainly because a widening bandgap fails to increase open-circuit voltage. We report on a bifacial all-perovskite tandem structures with an equiv…
View article: Defect engineering in wide-bandgap perovskites for efficient perovskite–silicon tandem solar cells
Defect engineering in wide-bandgap perovskites for efficient perovskite–silicon tandem solar cells Open
View article: Reducing sputter induced stress and damage for efficient perovskite/silicon tandem solar cells
Reducing sputter induced stress and damage for efficient perovskite/silicon tandem solar cells Open
The mechanisms of sputter induced stress and damage in perovskite/silicon tandem solar cells were investigated for optimizing buffer layer materials and transparent conductive oxides. A high power conversion efficiency of 26.0% has been ac…
View article: Sub-micrometer random-pyramid texturing of silicon solar wafers with excellent surface passivation and low reflectance
Sub-micrometer random-pyramid texturing of silicon solar wafers with excellent surface passivation and low reflectance Open
View article: Current-Matched III–V/Si Epitaxial Tandem Solar Cells with 25.0% Efficiency
Current-Matched III–V/Si Epitaxial Tandem Solar Cells with 25.0% Efficiency Open
View article: Simplified interconnection structure based on C60/SnO2-x for all-perovskite tandem solar cells
Simplified interconnection structure based on C60/SnO2-x for all-perovskite tandem solar cells Open
View article: Overcoming Redox Reactions at Perovskite-Nickel Oxide Interfaces to Boost Voltages in Perovskite Solar Cells
Overcoming Redox Reactions at Perovskite-Nickel Oxide Interfaces to Boost Voltages in Perovskite Solar Cells Open
View article: Triple-halide wide–band gap perovskites with suppressed phase segregation for efficient tandems
Triple-halide wide–band gap perovskites with suppressed phase segregation for efficient tandems Open
Tuning band gaps with three halides Tandem solar cells can boost solar cell efficiency by using two active layers to absorb the solar spectrum more completely, provided that the two cells are current-matched. Inorganic-organic perovskites …
View article: Blade-Coated Perovskites on Textured Silicon for 26%-Efficient Monolithic Perovskite/Silicon Tandem Solar Cells
Blade-Coated Perovskites on Textured Silicon for 26%-Efficient Monolithic Perovskite/Silicon Tandem Solar Cells Open
View article: Predicted Power Output of Silicon-Based Bifacial Tandem Photovoltaic Systems
Predicted Power Output of Silicon-Based Bifacial Tandem Photovoltaic Systems Open
View article: Origins of hydrogen that passivates bulk defects in silicon heterojunction solar cells
Origins of hydrogen that passivates bulk defects in silicon heterojunction solar cells Open
Silicon heterojunction solar cell fabrication incorporates a significant amount of hydrogen into the silicon wafer bulk, and the amount of injected hydrogen is comparable to that introduced by silicon nitride films during a high-temperatur…
View article: Defect engineering of p‐type silicon heterojunction solar cells fabricated using commercial‐grade low‐lifetime silicon wafers
Defect engineering of p‐type silicon heterojunction solar cells fabricated using commercial‐grade low‐lifetime silicon wafers Open
In this work, we integrate defect engineering methods of gettering and hydrogenation into silicon heterojunction solar cells fabricated using low‐lifetime commercial‐grade p‐type Czochralski‐grown monocrystalline and high‐performance multi…
View article: Contact Resistivity of the p-Type Amorphous Silicon Hole Contact in Silicon Heterojunction Solar Cells
Contact Resistivity of the p-Type Amorphous Silicon Hole Contact in Silicon Heterojunction Solar Cells Open
In silicon heterojunction solar cells made with high-lifetime wafers, resistive losses in the contacts dominate the total electrical power loss. Moreover, it is widely believed that the hole contact stack—a-Si:H(i)/a-Si:H(p)/ITO/Ag—is resp…
View article: P‐type Upgraded Metallurgical‐Grade Multicrystalline Silicon Heterojunction Solar Cells with Open‐Circuit Voltages over 690 mV
P‐type Upgraded Metallurgical‐Grade Multicrystalline Silicon Heterojunction Solar Cells with Open‐Circuit Voltages over 690 mV Open
Herein, low‐cost p‐type upgraded metallurgical‐grade (UMG) multicrystalline silicon wafers are processed from the edge of the silicon cast using a multi‐stage defect‐engineering approach, incorporating gettering and hydrogenation to improv…
View article: Series Resistance Measurements of Perovskite Solar Cells Using <i>J<sub>sc</sub></i>–<i>V<sub>oc</sub></i> Measurements
Series Resistance Measurements of Perovskite Solar Cells Using <i>J<sub>sc</sub></i>–<i>V<sub>oc</sub></i> Measurements Open
The fill factor ( FF ) of perovskite solar cells is considerably lower than that of gallium arsenide and silicon cells, though they have similar open‐circuit voltage deficits. To probe the FF loss, which mainly comes from series resistance…
View article: GaAs/silicon PVMirror tandem photovoltaic mini‐module with 29.6% efficiency with respect to the outdoor global irradiance
GaAs/silicon PVMirror tandem photovoltaic mini‐module with 29.6% efficiency with respect to the outdoor global irradiance Open
Balance‐of‐system costs now dominate the installed cost of photovoltaic systems, causing the annually averaged module efficiency to become a primary system cost driver. The resulting continued push towards higher module efficiencies, coupl…
View article: Grain Engineering for Perovskite/Silicon Monolithic Tandem Solar Cells with Efficiency of 25.4%
Grain Engineering for Perovskite/Silicon Monolithic Tandem Solar Cells with Efficiency of 25.4% Open
View article: Optical modeling of wide-bandgap perovskite and perovskite/silicon tandem solar cells using complex refractive indices for arbitrary-bandgap perovskite absorbers
Optical modeling of wide-bandgap perovskite and perovskite/silicon tandem solar cells using complex refractive indices for arbitrary-bandgap perovskite absorbers Open
Wide-bandgap perovskites are attractive top-cell materials for tandem photovoltaic applications. Comprehensive optical modeling is essential to minimize the optical losses of state-of-the-art perovskite/perovskite, perovskite/CIGS, and per…
View article: Minimizing Current and Voltage Losses to Reach 25% Efficient Monolithic Two-Terminal Perovskite–Silicon Tandem Solar Cells
Minimizing Current and Voltage Losses to Reach 25% Efficient Monolithic Two-Terminal Perovskite–Silicon Tandem Solar Cells Open
The rapid rise in efficiency and tunable bandgap of metal-halide perovskites makes them highly attractive for use in tandems on silicon. Recently we demonstrated a perovskite–silicon monolithic two-terminal tandem with 23.6% power conversi…
View article: Controlling Thin-Film Stress and Wrinkling during Perovskite Film Formation
Controlling Thin-Film Stress and Wrinkling during Perovskite Film Formation Open
Significant effort has focused on controlling the deposition of perovskite films to enable uniform films, enabling efficiencies to climb dramatically. However, little attention has been paid to the evolution of thin-film stresses during de…
View article: Volume holographic lens spectrum-splitting photovoltaic system for high energy yield with direct and diffuse solar illumination
Volume holographic lens spectrum-splitting photovoltaic system for high energy yield with direct and diffuse solar illumination Open
In this paper a prototype spectrum-splitting photovoltaic system based on volume holographic lenses (VHL) is designed, fabricated and tested. In spectrum-splitting systems, incident sunlight is divided in spectral bands for optimal convers…
View article: 15.3%-Efficient GaAsP Solar Cells on GaP/Si Templates
15.3%-Efficient GaAsP Solar Cells on GaP/Si Templates Open
As single-junction Si solar cells approach their practical efficiency limits, a new pathway is necessary to increase efficiency in order to realize more cost-effective photovoltaics. Integrating III-V cells onto Si in a multijunction archi…
View article: Improved light management in planar silicon and perovskite solar cells using PDMS scattering layer
Improved light management in planar silicon and perovskite solar cells using PDMS scattering layer Open
View article: Low‐refractive‐index nanoparticle interlayers to reduce parasitic absorption in metallic rear reflectors of solar cells
Low‐refractive‐index nanoparticle interlayers to reduce parasitic absorption in metallic rear reflectors of solar cells Open
Metal reflectors or electrodes in contact with optoelectronic devices can induce parasitic light absorption. A low‐refractive‐index (low‐ n ) layer inserted between the metal reflector and the optically active layer(s) reduces this absorpt…
View article: 23.6%-efficient monolithic perovskite/silicon tandem solar cells with improved stability
23.6%-efficient monolithic perovskite/silicon tandem solar cells with improved stability Open