• Current Photovoltaic Research
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• v.4 no.3
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• pp.98-107
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• 2016

Third-generation photovoltaics are of low cost based on solution processes and are targeting a high efficiency. To meet the commercial demand, however, significant improvements of both efficiency and stability are required. In this sense, interfacial engineering can be useful key to solve these issues because trap sites and interfacial energy barrier and/or chemical instability at organic/organic and organic/inorganic interfaces are critical factors of efficiency and stability degradation. Here, we thoroughly review the interfacial engineering strategies applicable to three representative third-generation photovoltaics - organic, perovskite, colloidal quantum dot solar cell devices.

• Proceedings of the KIEE Conference
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• 1996.07c
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• pp.1421-1423
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• 1996

In this study, the effect of solar cell cover glass on the solar cell performance is evaluated. Silicon solar cell (active area:4*6cm, efficiency:12.6% at AMO condition) is used for this study. ITO(Indium tin Oxide) film thickness of the ITO/AR/substrate glass/solar cell structure samples are $40{\AA}$, $60{\AA}$, $160{\AA}$, $240{\AA}$ respectively. The solar cell maximum output power on the stacking structure variations showed 465mW in the AR/ITO/substrate glass/solar cell, and minimum output power showed 403mW in the AR/substrate glass/solar cell. The maximum output power of the solar cell on the ITO thickness variations of the ITO/AR/substrate glass/solar cell showed 460mW at $40{\AA}$ then decrease output power as ITO thickness increase. For environment tests, all samples are exposed UV light in the vacuum chanber. The output power degradation of AR(UVR)/substrate glass/solar cell stacking structure is small compared with ITO/AR(UVR)/substrate glass/solar cell stacking structure.

• Journal of IKEEE
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• v.23 no.2
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• pp.538-542
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• 2019

Semiconductor oxides such as $TiO_2$ involved in light conversion efficiency are the main elements of dye-sensitized solar cells (DSSC) and are used to mix different semiconductor oxides to improve efficiency. In this research, characteristics of the dye-sensitive solar cell are studied using semiconductor oxide formed by mixing $TiO_2$ and $Nb_2O_5$. A solar cell is manufactured by adding $Nb_2O_5$ at different ratios in order to analyze electrical characteristics of a mixed semiconductor oxide on light conversion efficiency. With the addition of $Nb_2O_5$, the conductivity was further enhanced than the recombination phenomenon caused by contact with electrolytes, confirming the improve of short-circuit, open voltage, and conversion efficiency of solar cells.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.57 no.10
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• pp.1802-1806
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• 2008

Dye-sensitized solar cell (DSC) based on some advantages such as transparency, cheap materials and anti-sensibility for an anlge of incidence has been expected to capture most of solar cell market in the near future. To practical use of DSC, researches on high efficiency as well as upscaling are necessary. In this study, we tried to insert the grid electrode in DSC and scribe transparent conducting oxide (TCO) using Nd:YAG laser. The grid electrode makes the electron movement improved and diffusional movement minimized. Consequently, the efficiency of DSC was increased by reducing electron loss and the surface resistance of TCO. The grid electrode was made using Ag target by radio frequency sputtering. And the scribed surface was confirmed by taking a scanning electron microscopy photos. As the result, grid cell had improved photocurrent and fill factor as compared with the conventional cell. And the efficiency was increased about 1% by enhanced photocurrent and fill factor.

• Journal of the Microelectronics and Packaging Society
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• v.10 no.2
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• pp.33-37
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• 2003

The new textured surface epitaxial base(TSEB) cell as a high efficiency Si solar cell was fabricated and its eletro-optical characteristics were investigated. The fabricated device showed the open circuit voltage of 0.62 V, the short circuit current of 40 mA, the fill factor of 0.7, and the efficiency of 16% under the incident light of AM-1 100 mW/$cm^2$. The TSEB cell proposed in this paper has the structural superiority in the fabrication of high efficiency solar cell due to the carrier drift transport in the optical absorption region and the formation of back surface field by $P^-/P^+$ epitaxial base, and the low emitter series resistance by insertion of $n^+$ buried contact.

• Journal of Energy Engineering
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• v.15 no.3 s.47
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• pp.181-187
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• 2006

This paper is proposed to a solar cell power system used in fire emergency equipment. Also it is designed with a high efficiency power converter in order to increase efficiency of power system. The controlling switches used in DC-DC booster chopper and DC-AC inverter are operated with soft switching, which is applied to resonant circuit method to reduce switching loss. The result is that the system gets to high efficiency. In this paper, A detection circuit of maximum power point of solar cell is described in this paper. And the performance evaluations for the photovoltaic power system of high efficiency are examined by the analysis of a new tracking controller with a maximum power $P_{max}$ detection of solar cell.

• 한국신재생에너지학회:학술대회논문집
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• 2011.05a
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• pp.112.1-112.1
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• 2011

The back contact solar cell (BCSC) has several advantages compared to the conventional solar cell since it can reduce grid shadowing loss and contact resistance between the electrode and the silicon substrate. This paper presents the effect of the surface texturing of the silicon BCSC by varying the texturing depth or the texturing gap in the commercially available simulation software, ATHENA and ATLAS of the company SILVACO. The texturing depth was varied from $5{\mu}m$ to $150{\mu}m$ and the texturing gap was varied from $1{\mu}m$ to $100{\mu}m$ in the simulation. The resulting efficiency of the silicon BCSC was evaluated depending on the texturing condition. The quantum efficiency and the I-V curve of the designed silicon BCSC was also obtained for the analysis since they are closely related with the solar cell efficiency. Other parameters of the simulated silicon BCSC are as follows. The substrate was an n-type silicon, which was doped with phosphorous at $6{\times}10^{15}cm^{-3}$, and its thickness was $180{\mu}m$, a typical thickness of commercial solar cell substrate thickness. The back surface field (BSF) was $1{\times}10^{20}\;cm^{-3}$ and the doping concentration of a boron doped emitter was $8.5{\times}10^{19}\;cm^{-3}$. The pitch of the silicon BCSC was $1250{\mu}m$ and the anti-reflection coating (ARC) SiN thickness was $0.079{\mu}m$. It was assumed that the texturing was anisotropic etching of crystalline silicon, resulting in texturing angle of 54.7 degrees. The best efficiency was 25.6264% when texturing depth was $50{\mu}m$ with zero texturing gap in case of low texturing depth (< $100{\mu}m$).

• Korean Journal of Optics and Photonics
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• v.21 no.1
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• pp.1-5
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• 2010

In this study, we propose a grating structure using guided-mode resonance (GMR) to increase the absorption efficiency of a silicon solar cell. The proposed solar cell design consists of a one-dimensional diffraction grating and a planar waveguide layer of poly-silicon deposited on a silver reflector. We investigate the influence of structure parameters such as grating period, waveguide thickness, grating width and grating depth. Optimal parameters are found using the particle swarm optimization (PSO) algorithm. In the optimized GMR-assisted solar cell, absorption efficiency up to 65.8% is achieved in the wavelength range of 300 nm~750 nm.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2009.06a
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• pp.414-418
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• 2009

In this paper, a solar power tracking method using the solar cells is proposed, which has 3 solar cell located at an interval of $60^{\circ}$ in azimuth so that the sunlight may almost be perpendicular to the solar cells without excessive mechanical operation. Compared with the solar cell voltages in each azimuth, there is the highest voltage in time interval. As a results, this solar cell system achieve higher relative efficiency of $1.6{\sim}11.5%$ than fixed solar cell system. Therefore, it is verifying that this solar cell tracking system obtain more relative efficiency than fixed solar cell system for aid to navigation.

• 한국신재생에너지학회:학술대회논문집
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• 2008.10a
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• pp.124-127
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• 2008

Dye-sensitized solar cells (DSCs) have been proposed as a substitute for overcoming the limitation of Si solar cells because DSC has the various applications using advantages of DSC such as low cost, transparency and flexibility. Although some people point out low efficiency of DSC as the important problem at present, general views say that actually cumulative power is not insufficient as compared with Si solar cell. Therefore, we analyzed the characteristics of both cells according to the change of incident angle in this study. The insensibility about the incident angle has more developable time. Finally, DSC is able to fill a shortage of power caused from low efficiency of DSC for same time by developing during impossible time to develop in Si solar cell. As a result, DSC has 75% and 210% cumulative power of Si solar cell in summer and winter under the standard sunshine duration.