Surface Roughness and Crystallinity of Silicon Solar Cells Irradiated by Ultraviolet Femtosecond Laser Pulses

Nigo, Fumitaka; Hashida, Masaki; Tsukamoto, Masahiro; Shimizu, Shuji; Kusaba, Mitsuhiro

doi:10.1541/ieejfms.140.401

Cited by 2 publications

(2 citation statements)

References 8 publications

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“…5,6 LIPSS exhibits novel functionalities, such as structural coloration, 7 controlled surface wettability, 8 improved biocompatibility, 9,10 friction reduction, 11 and enhanced solar cell performance. 12 Although studies have investigated the influences of period and depth of structures on the functionality, few reports have investigated the effect of structural uniformity. To improve the uniformity of LIPSS, Miyazaki and Miyaji scratched the material prior to laser irradiation.…”

Section: Introductionmentioning

confidence: 99%

Uniformity evaluation of laser-induced periodic surface structures formed by two-color double-pulse femtosecond laser irradiation

Takenaka

Hashida

Sakagami

et al. 2022

Review of Scientific Instruments

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The Perpendicular Period and Phase Scanning (P3S) method can evaluate the uniformity of a laser-induced periodic surface structure (LIPSS). P3S assesses the uniformity of LIPSS using the standard deviation of the peak period and the average of the phase difference in the direction perpendicular to LIPSS. The P3S method demonstrates that LIPSS formed by two-color double-pulse irradiation is reduced to a quarter of the period dispersion, and the average phase difference of LIPSS is also reduced compared to the single-pulse irradiation. In addition, a 3D electromagnetic particle-in-cell simulation was performed to evaluate the possibility of an improved uniformity of LIPSS. The results confirm that the two-color double-pulse irradiation produces a uniform LIPSS and validates the effectiveness of the P3S method to assess the uniformity of LIPSS.

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Section: Introductionmentioning

confidence: 99%

Uniformity evaluation of laser-induced periodic surface structures formed by two-color double-pulse femtosecond laser irradiation

Takenaka

Hashida

Sakagami

et al. 2022

Review of Scientific Instruments

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“…And LIPSS can be formed on almost all solid materials. These advantages are applicable potentially to solar cells [29][30][31] , hydrophilic and hydrophobic functional materials 32,33 , quantum light-emitting diodes 34 , and microscale random-laser 35 . However, the lattice states and crystallinity of the LIPSS have not yet been fully understood, although it directly influences the final device properties for such applications.…”

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confidence: 99%

Crystallinity in periodic nanostructure surface on Si substrates induced by near- and mid-infrared femtosecond laser irradiation

Miyagawa

Kamibayashi

Nakamura

et al. 2022

Sci Rep

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Laser-induced periodic surface structure (LIPSS), which has a period smaller than the laser wavelength, is expected to become a potential technique for fine surface processing. We report the microscopic and macroscopic observations of the crystallinity of LIPSSs, where the characteristics such as defects generation and residual strain were analyzed, respectively. The LIPSSs were formed on a Si substrate using two different femtosecond pulses from Ti:Sapphire laser with near-infrared wavelength (0.8 μm) and free-electron laser (FEL) with mid-infrared wavelength (11.4 μm). The photon energies of the former and latter lasers used here are higher and lower than the Si bandgap energies, respectively. These LIPSSs exhibit different crystalline states, where LIPSS induced by Ti:Sapphire laser show residual strain while having a stable crystallinity; in contrast, FEL-LIPSS generates defects without residual strain. This multiple analysis (microscopic and macroscopic observations) provides such previously-unknown structural characteristics with high spatial resolution. To obtain LIPSS with suitable properties and characteristics based on each application it is paramount to identify the laser sources that can achieve such properties. Therefore, identifying the structural information of the LIPSS generated by each specific laser is of great importance.

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Surface Roughness and Crystallinity of Silicon Solar Cells Irradiated by Ultraviolet Femtosecond Laser Pulses

Cited by 2 publications

References 8 publications

Uniformity evaluation of laser-induced periodic surface structures formed by two-color double-pulse femtosecond laser irradiation

Uniformity evaluation of laser-induced periodic surface structures formed by two-color double-pulse femtosecond laser irradiation

Crystallinity in periodic nanostructure surface on Si substrates induced by near- and mid-infrared femtosecond laser irradiation

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