• 제목/요약/키워드: Optical trapping

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Effect On Glass Texturing For Enhancement of Light Trapping in Perovskite Solar Cells

  • Kim, Dong In;Nam, Sang-Hun;Hwang, Ki-Hwan;Lee, Yong-Min;Boo, Jin-Hyo
    • 한국진공학회:학술대회논문집
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    • 한국진공학회 2016년도 제50회 동계 정기학술대회 초록집
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    • pp.387.2-387.2
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    • 2016

  • Glass texturing is a sufficient method for changing the surface morphology to enhance the light trapping. In this study, glass texturing was applied to the perovskite solar cell for improving the current density. Glass substrates (back-side glass of FTO coated glass substrate) were textured by randomly structure assisted wet etching process using diluted HF solution at a constant concentration of etchants (HF:H2O=1:1). Then, the light trapping properties of suitable films were controlled over a wide range by varying the etching time (1, 2, 3, 4 and 5 min.). The surface texturing changed the reflected light in an angle that it can be reflected by substrate glass surface. As a result, Current density and cell efficiency were affected by light trapping layer using glass texturing method in perovskite solar cells.

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A Magneto-optical Trap Below a Dielectric Coated Mirror Surface

  • Yu, Hoon;Lee, Lim;Lee, Kyung-Hyun;Kim, Jung-Bog
    • Journal of the Optical Society of Korea
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    • 제13권2호
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    • pp.223-226
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    • 2009

  • A Magneto-Optical Trap (MOT) for $^{87}Rb$ atoms near the surface of a dielectric coated mirror at the top of a small $20{\times}25{\times}40\;mm^3$ cell has been observed. Two beams of $3.3\;mW/cm^2$ were used for optical cooling and an anti-Helmholtz magnetic field with a spatial gradient of 9.1 G/cm was used for magnetic trapping. The thickness of the mirror coated on a cover glass was less than $100{\mu}m$. The mirror covered the top of a cell and the atom-chip was located outside the vacuum in order to exploit the long life time of the mirror and easy operation of the chip. The trapping position was found 5 mm beneath the mirror surface. The number of trapped atoms was roughly $3{\times}10^7$ atoms and the temperature was approximately a few tens mK. In this paper, we describe the construction of the mirror-MOT in detail.

  • https://doi.org/10.3807/JOSK.2009.13.2.223 인용 PDF KSCI