• Title/Summary/Keyword: Planar solar cell

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STUDY ON THE HIGH EFFICIENCY BURIED CONTACT SOLAR CELL WITH WET ETCHING PROCESS

  • Kang, Dae-Keun;Choi, Kang-Ho;Lee, Joo-Yul;Lee, Kyu-Hwan
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • 2009.10a
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    • pp.156-156
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    • 2009
  • High efficiency silicon solar cell technology based on planar technology has been improved by various kinds of process by using the wet etching process. In particular, the buried contact solar cell has been successfully studied. In the present work, a simplified process of the buried contact solar cell has been suggested to help one design effectively the high-efficiency solar cell.

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Emitter Electrode Design to Optimize the Optical and Electrical Characteristics of Planar Solar Cells (평판형 태양 전지의 광학 및 전기적 특성 최적화를 위한 에미터 전극 설계 연구)

  • Lee, Sangbok;Do, Yun Seon
    • Korean Journal of Optics and Photonics
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    • v.31 no.1
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    • pp.37-44
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    • 2020
  • In this study, we propose a design method to optimize the electro-optical efficiency of a planar solar cell structure by adjusting one-dimensionally periodic emitter electrodes. Since the aperture ratio of the active layer decreases as the period of the emitter electrode decreases, the amount of light absorption diminishes, affecting the performance of the device. Here we design the optimal structure of the periodic emitter electrode in a simple planar solar cell, by simulation. In terms of optics, we find the condition that shows optical performance similar to that of a reference without the emitter electrode. In addition, the optimized electrode structure is extracted considering both the optical and electrical efficiency. This work will help to increase the utilization of solar cells by suggesting a structure that can most efficiently transfer charge generated by photoelectric conversion to the electrodes.

Fabrication and Characterization of Electro-photonic Performance of Nanopatterned Organic Optoelectronics

  • Nil, Ri-Swi;Han, Ji-Yeong;Gwon, Hyeon-Geun;Lee, Gyu-Tae;Go, Du-Hyeon
    • Proceedings of the Korean Vacuum Society Conference
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    • 2014.02a
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    • pp.134.2-134.2
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    • 2014
  • Photonic crystal solar cells have the potential for addressing the disparate length scales in polymer photovoltaic materials, thereby confronting the major challenge in solar cell technology: efficiency. One must achieve simultaneously an efficient absorption of photons with effective carrier extraction. Unfortunately the two processes have opposing requirements. Efficient absorption of light calls for thicker PV active layers whereas carrier transport always benefits from thinner ones, and this dichotomy is at the heart of an efficiency/cost conundrum that has kept solar energy expensive relative to fossil fuels. This dichotomy persists over the entire solar spectrum but increasingly so near a semiconductor's band edge where absorption is weak. We report a 2-D, photonic crystal morphology that enhances the efficiency of organic photovoltaic cells relative to conventional planar cells. The morphology is developed by patterning an organic photoactive bulk heterojunction blend of Poly(3-(2-methyl-2-hexylcarboxylate) thiophene-co-thiophene) and PCBM via PRINT, a nano-embossing method that lends itself to large area fabrication of nanostructures. The photonic crystal cell morphology increases photocurrents generally, and particularly through the excitation of resonant modes near the band edge of the organic PV material. The device performance of the photonic crystal cell showed a nearly doubled increase in efficiency relative to conventional planar cell designs. Photonic crystals can also enhance performance of other optoelectronic devices including organic laser.

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A Study of High-efficiency me-silicon solar cells for SiNx passivation (SiNx passivation에 따른 Solar Cell의 효율향상에 관한 연구)

  • Ko, Jae-Kyung;Lim, Dong-Gun;Kim, Do-Young;Park, Sung-Hyun;Park, Joong-Hyun;Yi, Jun-Sin
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2002.07b
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    • pp.964-967
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    • 2002
  • The effectiveness of silicon nitride SiNx surface passivation is investigated and quantified. This study adopted single-layer antireflection (SLAR) coating of SiNx for efficiency improvement of solar cell. The silicon nitride films were deposited by means of plasma enhanced chemical vapor deposition (PECVD) in planar coil reactor. The process gases used were pure ammonia and a mixture of silane and helium. The thickness and the refractive index on the films were measured by ellipsometry and chemical bonds were determined by using an FT-IR equipment. This films obtained were analyzed in term of hydrogen content, refractive index for gas flow ratio $(NH_3/SiH_4)$, and efficiency of solar cell. The polycrystalline silicon solar cells passivated by silicon nitride shows efficiency above 12.8%.

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High Efficiency Crystalline Silicon Solar Cells (고효율 단결정 실리콘 태양전지)

  • Kim, D.S.;Cho, E.C.;Cho, Y.H.;Ebong, A.U.;Min, Y.S.;Lee, S.H.
    • Solar Energy
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    • v.17 no.1
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    • pp.17-26
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    • 1997
  • Since PESC(passivated emitter solar cell) was developed in 1985, high efficiency silicon solar cell technology based on planar technology has been improved in the order of PERC, Point Contact Solar Cell, PERL. BCSC and DSBC, which do not require photolithography, are expected to replace commercial screen printed cells because of its potential for low cost and high efficiency. In this paper, history and characteristics of each type of cells are reviewed.

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Fabrication High Covered and Uniform Perovskite Absorbing Layer With Alkali Metal Halide for Planar Hetero-junction Perovskite Solar Cells

  • Lee, Hongseuk;Kim, Areum;Kwon, Hyeok-chan;Moon, Jooho
    • Proceedings of the Korean Vacuum Society Conference
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    • 2016.02a
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    • pp.427-427
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    • 2016
  • Organic-inorganic hybrid perovskite have attracted significant attention as a new revolutionary light absorber for photovoltaic device due to its remarkable characteristics such as long charge diffusion lengths (100-1000nm), low recombination rate, and high extinction coefficient. Recently, power conversion efficiency of perovskite solar cell is above 20% that is approached to crystalline silicon solar cells. Planar heterojunction perovskite solar cells have simple device structure and can be fabricated low temperature process due to absence of mesoporous scaffold that should be annealed over 500 oC. However, in the planar structure, controlling perovskite film qualities such as crystallinity and coverage is important for high performances. Those controlling methods in one-step deposition have been reported such as adding additive, solvent-engineering, using anti-solvent, for pin-hole free perovskite layer to reduce shunting paths connecting between electron transport layer and hole transport layer. Here, we studied the effect of alkali metal halide to control the fabrication process of perovskite film. During the morphology determination step, alkali metal halides can affect film morphologies by intercalating with PbI2 layer and reducing $CH3NH3PbI3{\cdot}DMF$ intermediate phase resulting in needle shape morphology. As types of alkali metal ions, the diverse grain sizes of film were observed due to different crystallization rate depending on the size of alkali metal ions. The pin-hole free perovskite film was obtained with this method, and the resulting perovskite solar cells showed higher performance as > 10% of power conversion efficiency in large size perovskite solar cell as $5{\times}5cm$. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and inductively coupled plasma optical emission spectrometry (ICP-OES) are analyzed to prove the mechanism of perovskite film formation with alkali metal halides.

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Control the crystal size by varying concentrations of precursors for the planar perovskite solar cells

  • Xie, Lin;Hwang, Heewon;Kim, Minjung;Kim, Kyungkon
    • Rapid Communication in Photoscience
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    • v.4 no.4
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    • pp.79-81
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    • 2015
  • The influence of the grain size of the $CH_3NH_3PbI_3$ on the solar cell performance is investigated by controlling the ratio between $CH_3NH_3I$ and $PbI_2$ precursors. As the concentration of the precursors increased from 1.0M to 2.0M, the $CH_3NH_3PbI_3$ grain size increased from ~100nm to ~400nm. The solar cell utilizing the $CH_3NH_3PbI_3$ with large grain size shows improved photocurrent compared to the solar cell utilizing $CH_3NH_3PbI_3$ with small grain size, which is ascribed to the reduced recombination at the boundaries of grains.

Enhanced Absorption Efficiency of Solar Cells Using Guided-mode Resonance (도파모드 공진을 이용한 태양전지의 흡수효율 증대)

  • Kim, Doo-Sung;Kim, Sang-In;Lee, Jae-Jin;Lim, Han-Jo
    • 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.

Development of Inorganic Metal Oxide based Hole-Transporting Layer for High Efficiency Perovskite Solar Cell (고효율 페로브스카이트 태양전지용 무기 금속 산화물 기반 정공수송층의 개발)

  • Lee, Haram;Mai, Cuc Thi Kim;Jang, Yoon Hee;Lee, Doh-Kwon
    • Current Photovoltaic Research
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    • v.8 no.2
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    • pp.60-65
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    • 2020
  • In perovskite solar cells with planar heterojunction configuration, selection of proper charge-transporting layers is very important to achieve stable and efficient device. Here, we developed solution processible Cu doped NiOx (Cu:NiOx) thin film as a hole-transporting layer (HTL) in p-i-n structured methylammonium lead trihalide (MAPbI3) perovskite solar cell. The transmittance and thickness of NiOx HTL is optimized by control the spin-coating rate and Cu is additionally doped to improve the surface morphology of undoped NiOx thin film and hole-extraction properties. Consequently, a perovskite solar cell containing Cu:NiOx HTL with optimal doping ratio of Cu exhibits a power conversion efficiency of 14.6%.

Investigation of varied suface passivation layers for solar cells (태양전지를 위한 다양한 표면 패시베이션(passivation) 막들의 연구)

  • Lee, Ji-Youn;Lee, Soo-Hong
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2004.05a
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    • pp.90-93
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    • 2004
  • In this work, we have used different techniques for the surface passivation: conventional thermal oxidation (CTO), rapid thermal oxidation (RTO), and plasma-enhanced chemical vapour deposition (PECVD). The surface passivation qualities of eight different single and combined double layer have been investigated both on the phosphorus non-diffused p-type FZ silicon and on phosphorus diffused emitter of 100 ${\Omega}/Sq$ and 40 ${\Omega}/Sq$. In the single layer, silicon dioxide $(SiO_2)$ passivates good on the emitter while silicon nitride (SiN) passivates better than on the non-diffused surface. In the double layers, CTO/SiN1 passivates very well both on non-diffused surface on the emitter. However, RTO/SiN1 and RTO/SiN2 stacks are more suitable for surface passivation in solar cells caused by a relatively good passivation qualities and the low optical reflection. Applying these stacks in solar cells we achieved 18.5 % and 18.8 % on 0.5 ${\Omega}$ cm FZ-Si with planar and textured front surface, respectively. The excellent open circuit voltage $(V_{oc})$ of 675.6 mV is obtained the planar cell with RTO/SiN stack.

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