Microstructure and optical properties of black silicon layers

Jurečka, Stanislav; Králik, Martin; Pinčík, Emil; Imamura, Kentaro; Matsumoto, Tetsuya; Kobayashi, Hikaru

doi:10.1117/12.2518368

Cited by 5 publications

(6 citation statements)

References 17 publications

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“…The transmittance of b-Si is very low for all thicknesses compared to that of c-Si. Gradual development of the real and imaginary parts of the complex index of refraction was observed in b-Si layers [8] . The reflectance of the sample was strongly influenced by an increase in the thickness of the b-Si layer.…”

Section: Introductionmentioning

confidence: 94%

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Optical Properties of the Crystalline Silicon-black Silicon-perovskite Tandem Solar Cells

Gasparyan

2023

Advanced Materials Science and Technology

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The optical properties of a tandem three-layered structure of crystalline silicon-black siliconperovskite have been theoretically studied for using it in solar energy conversion. The transfer matrix method is used for obtaining the analytical expressions for the reflection, transmission, and absorption coefficients. It is shown that the transfer matrix method can be successfully applied to the more complicated case of three layers with complex refractive indexes. Numerical calculations performed at an angle of incidence of radiation of 60 o showed that in the region of short wavelengths the reflection coefficient takes on low values (several percent), which gradually increase and become > 10% at wavelengths above 0.8 μm. The theoretically modeled results of the reflection coefficient are in good agreement with experimental data carried out for the structures crystalline silicon-black silicon-TiO 2 -perovskite. The discrepancy between the experimental and model data slowly increases with increasing wavelength. The transmittance was extremely low and increased slowly with the increasing wavelength. It is found that cheaper and easier created tandem crystalline silicon-black siliconperovskite structure may have the potential for solar energy conversion.

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Section: Introductionmentioning

confidence: 94%

“…For 10 μm thickness b-Si layer, the reflectance was below 1% and was very close to zero. For the c-Si/b-Si tandem, the influence of changes in the b-Si thickness on the reflectance of the multilayer was absent, and in the wavelength range of 0.4-1.0 μm, the reflectance changed almost uniformly [8] .…”

Section: Introductionmentioning

confidence: 99%

Optical Properties of the Crystalline Silicon-black Silicon-perovskite Tandem Solar Cells

Gasparyan

2023

Advanced Materials Science and Technology

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“…Currently, the so-called "black Si" or "Si grass" is successfully used to form nanotextured surfaces in traditional single-junction Si solar cells. [28][29][30][31][32][33][34] Black Si has a needle-like surface nanostructure that increases the surface area. As a result, reflection is reduced, and hence the amount of light captured is increased.…”

Section: Doi: 101002/pssr202200482mentioning

confidence: 99%

Structural and Optical Properties of Vacuum‐Evaporated Mixed‐Halide Perovskite Layers on Nanotextured Black Silicon

Vaseashta

Ayvazyan

Khudaverdyan

et al. 2023

Physica Rapid Research Ltrs

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To improve the absorption of light in two‐junction tandem perovskite–silicon solar cells, antireflective textures are often created on the front surface in the form of micronsized pyramids using wet‐chemical etching. It is known that single‐junction silicon solar cells with nanotextured black silicon (BS) formed by dry‐etching techniques are more efficient than pyramidal microtextures. Herein, experimental evidence of enhanced efficiency of structures using BS between the perovskite layer and the silicon substrate for the first time is demonstrated. BS is fabricated using plasma‐based reactive‐ion etching on the front surface of the crystalline silicon. The deposition of mixed‐halide perovskite layers is performed by vacuum coevaporation and sequential evaporation. The structural and optical properties of evaporated perovskite layers with various thicknesses are investigated. It is found that the structural‐phase quality (viz., surface coverage, chemical composition, dimensionality, crystallinity, and phase purity) of perovskite layers on planar and nanotextured substrates is similar. However, the root mean square roughness of the perovskite layers on nanotextured substrates is much higher, which reduces the reflection significantly, especially, in the range of radiation incidence angle up to 60°. These results pave the way for the development of high‐performance perovskite–silicon tandem solar cells for improved efficiency.

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“…[14,15] Black Si (b-Si) is a nanostructured layer of crystalline Si consisting of thin needles with a high density, the height of which can be 0.3-10.0 μm, and the diameter-of 0.05-1.0 μm. [23][24][25][26][27][28] The presence of needles gives this material a darkened black hue, hence its name. Black Si can be fabricated by many methods including plasma-based reactive ion etching (RIE), metal-assisted chemical etching (MACE), and femtosecond-pulsed laser (fs-laser) treatment.…”

Section: Introductionmentioning

confidence: 99%

External Gettering of Metallic Impurities by Black Silicon Layer

Ayvazyan

Hakhoyan

Ayvazyan

et al. 2023

Physica Status Solidi (a)

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Black silicon (b‐Si) has many attractive properties and is currently being adopted in various fields of semiconductor technology. It is shown here that b‐Si during thermal activation may serve as an external gettering layer to remove metallic impurities and associated defects from bulk Si. The gettering efficiency by b‐Si is estimated according to the results of studying the resistivity, defect density, interstitial iron concentration, and effective minority carrier lifetime on gettered test and ungettered reference Si samples. It is shown that in the thermal oxidation process, the b‐Si layer serves as an effective drain for excess iron atoms and other fast‐diffusing impurities, thereby significantly reducing the density of oxidation‐induced stacking faults in Si. In addition, the resistivity of the substrates decreases, and the bulk carrier lifetime increases significantly. Finally, gettering by b‐Si is introduced into the solar cells fabrication process and its effect on solar cell current–voltage characteristics is investigated. It has been shown that all electronic parameters of the solar cells are improved. The conversion efficiency of ungettered solar cells is 16.8%, and for gettered solar cells, depending on the oxidation temperature, it increases by 1.36–1.96%.

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Microstructure and optical properties of black silicon layers

Cited by 5 publications

References 17 publications

Optical Properties of the Crystalline Silicon-black Silicon-perovskite Tandem Solar Cells

Optical Properties of the Crystalline Silicon-black Silicon-perovskite Tandem Solar Cells

Structural and Optical Properties of Vacuum‐Evaporated Mixed‐Halide Perovskite Layers on Nanotextured Black Silicon

External Gettering of Metallic Impurities by Black Silicon Layer

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