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Zhongyi Han,Peng Gao,Jingjing Ai,Gongju Liu,Hanlin Xiao 한국광학회 2023 Current Optics and Photonics Vol.7 No.5
As an effective means of remotely detecting the spectral information of the object, the spectral calibration for the Savart polarization interference imaging spectrometer (SPIIS) is a basis and prerequisite of information quantification, and its experimental calibration scheme is firstly proposed in this paper. In order to evaluate the accuracy of the spectral information acquisition, the linear interpolation, cubic spline interpolation, and piecewise cubic interpolation algorithms are adopted, and the precision of the quadratic polynomial fitting is the highest, whose fitting error is better than 5.8642 nm in the wavelength range of [500 nm, 820 nm]. Besides, the inversed value of the spectral resolution for the monochromatic light is greater than the theoretical value, and the deviation between them becomes larger with the wavelength increasing, which is mainly caused by the structural design of the SPIIS, together with the rationality of the spectral restoration algorithm and the selection of the maximum optical path difference (OPD). This work demonstrates that the SPIIS has achieved high performance assuring the feasibility of its practical use in various fields.
Optical properties of Si microwires combined with nanoneedles for flexible thin film photovoltaics
Park, Kwang-Tae,Guo, Zhongyi,Um, Han-Don,Jung, Jin-Young,Yang, Jun Mo,Lim, Sung Kyu,Kim, Young Su,Lee, Jung-Ho The Optical Society 2011 Optics express Vol.19 No.1
<P>A combined wire structure, made up of longer periodic Si microwires and short nanoneedles, was prepared to enhance light absorption using one-step plasma etching via lithographical patterning. The combined wire array exhibited light absorption of up to ~97.6% from 300 to 1100 nm without an anti-reflection coating. These combined wire arrays on a Si substrate were embedded into a transparent polymer. A large-scale wire-embedded soft film was then obtained by peeling the polymer-embedded wire portion from the substrate. Optically attractive features were present in these soft films, making them suitable for use in flexible silicon solar cell applications.</P>
A strong antireflective solar cell prepared by tapering silicon nanowires
Jung, Jin-Young,Guo, Zhongyi,Jee, Sang-Won,Um, Han-Don,Park, Kwang-Tae,Lee, Jung-Ho The Optical Society 2010 Optics express Vol.18 No.suppl3
<P>Vertically aligned silicon nanowires (SiNWs) were cost-effectively formed on a four-inch silicon wafer using a simple room temperature approach, i.e., metal-assisted electroless etching. Tapering the NWs by post-KOH dipping achieved separation of each NW from the bunched NW, resulting in a strong enhancement of broadband optical absorption. As electroless etching time increases, the optical crossover feature was observed in the tradeoff between enhanced light trapping (by graded-refractive index during initial tapering) and deteriorated reflectance (by decreasing the areal density of NWs during later tapering). Compared to the bunched SiNWs, tapered NW solar cells demonstrated superior photovoltaic characteristics, such as a short circuit current of 17.67 mA/cm² and a cell conversion efficiency of ~6.56% under 1.5 AM illumination.</P>
A waferscale Si wire solar cell using radial and bulk p–n junctions
Jung, Jin-Young,Guo, Zhongyi,Jee, Sang-Won,Um, Han-Don,Park, Kwang-Tae,Hyun, Moon Seop,Yang, Jun Mo,Lee, Jung-Ho IOP Pub 2010 Nanotechnology Vol.21 No.44
<P>Silicon nanowires (NWs) and microwires (MWs) are cost-effectively integrated on a 4-inch wafer using metal-assisted electroless etching for solar cell applications. MWs are periodically positioned using low-level optical patterning in between a dense array of NWs. A spin-on-doping technique is found to be effective for the formation of heavily doped, thin n-type shells of MWs in which the radial doping profile is easily delineated by low voltage scanning electron microscopy. Controlled tapering of the NWs results in additional optical enhancement via optimization of the tradeoff between increased light trapping (by a graded-refractive-index) and increased reflectance (by decreasing areal density of NWs). Compared to single NW (or MW) arrayed cells, the co-integrated solar cells demonstrate improved photovoltaic characteristics, i.e. a short circuit current of 20.59 mA cm<SUP> − 2</SUP> and a cell conversion efficiency of ∼ 7.19% at AM 1.5G illumination. </P>
Zhou, Keya,Guo, Zhongyi,Li, Xiaopeng,Jung, Jin-Young,Jee, Sang-Won,Park, Kwang-Tae,Um, Han-Don,Wang, Ning,Lee, Jung-Ho Optical Society of America 2012 Optics express Vol.20 No.5
<P>We perform a systematic numerical study to characterize the tradeoff between the plasmonic enhancement and optical loss in periodically aligned, silicon nanowire (SiNW) arrays integrated with a silver back reflector (Ag BR). Optimizing the embedded depth of the wire bottoms into a silver reflector achieved a highly efficient SiNW solar cell. Compared to the SiNW solar cell employing a flat back reflector, the embedded depth of ~20 nm resulted in the relative increase of ~5% in ultimate solar cell efficiency.</P>
Fabrication of polymer compound microlens by lens-on-lens microstructures
Zehua Xia,Yan Li,Xiaoya Su,Yanhua Han,Zhongyi Guo,Jian-Min Gao,Qiaoqun Sun,Shiliang Qu 한국물리학회 2017 Current Applied Physics Vol.17 No.1
We proposed a novel method for fabricating polymer compound microlenses (PCMLs) using micro-inkjet technique and subsequent curing process. Two different types of PCMLs with sandwich microstructure (PDMS-Glycerol-PDMS), concave and convex PCMLs, have been designed and fabricated in experiments. Convex PCML has two real images and two foci. The concave PCML has one real and one virtual focal planes, which can generate one real image and one virtual image respectively. Moreover, the diameter of concave PCML can be controlled by adjusting the curing time and temperature. The proposed method is simple, efficient and suitable for realizing large-scale high numerical aperture PCMLs array, which has potential applications in diverse optical systems such as optical storage and three-dimensional imaging.