• 제목/요약/키워드: surface texturing

검색결과 253건 처리시간 0.027초

표면 Texturization을 가진 Photovoltaic Device 내부의 열 분포 특성에 관한 연구 (A Study of the Thermal Characteristics of a Photovoltaic Device with Surface Texturization)

  • 정지철;문경숙;구상모
    • 한국전기전자재료학회논문지
    • /
    • 제23권7호
    • /
    • pp.509-512
    • /
    • 2010
  • The thermal distribution of 2D and 3D p-n photovoltaic diode structures with and without surface texturing has been studied. By analysis of the numerical simulation results of the I-V characteristics and lattice temperature distributions the effect of different texturing structures on the characteristics of silicon p-n photovoltaic devices has been studied systematically. The efficiency of the device having surface texturing shows more than ~2% enhancement compared to the reference devices which did not have texturing. In addition, the effect of the density of the texturing groove has been studied and it has been confirmed that the texturing structure not only improves the light trapping but also plays an important role in the heat radiation.

Fiber Laser를 이용한 다결정 태양전지 Surface Texturing

  • 김태훈;김선용;고지수;박홍진;김광열;최병덕
    • 한국전기전자재료학회:학술대회논문집
    • /
    • 한국전기전자재료학회 2009년도 추계학술대회 논문집
    • /
    • pp.270-270
    • /
    • 2009
  • The surface texturing technology is one of the methods to improve the efficiency of crystalline silicon solar cell. This process reduced the reflectance at the surface by the so-called double bounce effect and increased the light trapping. Among these surface texturing technology, the laser texturing is effective for multi-crystalline silicon solar cells which have random crystallographic directions. We investigated the characteristics of laser processing on the surface of the multi-crystalline silicon solar cells using the fiber laser.

  • PDF

Surface Texturing에 의한 유압부품의 마찰저감 (Surface Texturing in Hydraulic Machine Components for Friction Reduction)

  • 박태조;김민규
    • 드라이브 ㆍ 컨트롤
    • /
    • 제13권1호
    • /
    • pp.27-33
    • /
    • 2016
  • In hydraulic machinery, the hydraulic fluid acts primarily as working fluid and secondarily as a lubricant. Hence, the viscous friction force acting on the sliding components should be reduced to improve the mechanical efficiency. It is now well known that the surface texturing is a useful method for friction reduction. In this study, using a commercial computational fluid dynamics (CFD) code, FLUENT, the lubrication characteristics of a surface textured slider bearing under high boundary pressure difference is studied. The streamlines, velocity profiles, pressure distributions, load capacity, friction force and leakage flowrate are highly affected by the film thickness ratio and the textured region. Partial texturing at the inlet region of the inclined slider bearing can reduce both friction force and leakage flowrate than in the untextured case. The present results can be used to improve the lubrication characteristics of hydraulic machinery.

연삭기법을 이용한 패터닝 기술 (Grinding Technology for Surface Texturing)

  • 고태조;한두섭;구강;박종권
    • 한국정밀공학회지
    • /
    • 제31권5호
    • /
    • pp.367-373
    • /
    • 2014
  • Surface texturing is a machining process on the surface to give engineering functions. The representative process of the surface texturing is lotus effect to give hydrophobic property by the lithography and chemical etching, which is the bio mimic from the nature. Surface texturing can be manufactured by a lot of processes, in particular using mechanical method such as a precise diamond turning, grinding, rolling, embossing, vibrorolling, and abrasive jet machining (AJM). Among them, the grinding process is notable in terms of the wide range of texturing area and fast processing time. The patterning by grinding is done by the grooved grinding wheel on the work piece. In this case, the pattern shape is determined by the grinding conditions as well as the wheel dressing conditions. In this paper, experimental study on the pattern shapes were done and provide the feasibility in use for the large area patterning.

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
    • /
    • 한국진공학회 2016년도 제50회 동계 정기학술대회 초록집
    • /
    • pp.387.2-387.2
    • /
    • 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.

  • PDF

미세 딤플의 밀도에 따른 SCM415강의 마찰 거동 연구 (A study of Frictional Behavior of SCM415 Steel as a Function of Density of Micro Dimples)

  • 조민행;이성혁;박상일;여인웅
    • Tribology and Lubricants
    • /
    • 제26권6호
    • /
    • pp.311-316
    • /
    • 2010
  • Surface texturing of micro dimple or pore-shaped pattern was prepared using a fiber laser system. Surface texturing was designed to have a square pattern with a particular pitch distance for each corresponding density of 5, 10, 20, and 30%. Thermal damages such as bulges and burrs formed during laser irradiation were observed around the dimples. Thermal damages were later removed by lapping using alumina particles of $0.3{\mu}m$ in diameter. Oscillating friction tests were performed against heat-treated high speed steels under lubricated condition. The lubricant used was SAE 5W-30 automotive engine oil. Normal contact pressure and oscillating frequency was 0.28 MPa and 20 Hz, respectively. The tests were continued for 20 minutes, and friction plots were recorded for examination. Results revealed that the coefficient of friction was lowered regardless of texturing density. Moreover, the lowest coefficient of friction was obtained for 10% density texturing. It is attributed to increased lubricity due to the introduction of surface texturing. In addition, it is concluded that the optimum texturing density and pattern must be found for the best lubricity and low friction.

다결정 태양 전지 효율 향상 위한 Laser 표면 texturing (Laser texturing on the surface for improvement of multi-crystalline solar cells)

  • 김태훈;김선용;고지수;박현호;김광열;조창현;신성욱;최병덕
    • 한국신재생에너지학회:학술대회논문집
    • /
    • 한국신재생에너지학회 2009년도 추계학술대회 논문집
    • /
    • pp.364-364
    • /
    • 2009
  • The solar cell is in the spotlight as a future green energy source. In the solar cells based on silicon wafer, the improvement of efficiency is one of crucial issues. One of techniques for high efficiency is texturing on the surface of solar cells. We studied the laser texturing on the surface of multi-crystalline silicon solar cells. The laser texturing followed by chemical etching is adequate for the multi-crystalline structure which have random crystallographic directions. We used the fiber laser for texturing and the SiNx as a masking layer for etching process. We investigated the shapes of holes for texturing in the various laser power conditions and analyzed the holes after removal of thermal damages caused by laser ablation through a 3D profiler.

  • PDF

산성 표면절삭결함 제거 공정에 의한 실리콘 태양전지의 텍스쳐링 효과 개선 (Investigation of Improving Texturing Effect by Surface Saw Damage Etching Using Acidic Etchant for Silicon Solar Cells)

  • 박하영;이준성;권순우;윤세왕;임희진;김동환
    • 대한금속재료학회지
    • /
    • 제46권12호
    • /
    • pp.835-840
    • /
    • 2008
  • Texturing for crystalline silicon solar cells is one of the important techniques to increase conversion efficiency by effective photon trapping. Generally, incoming wafers or alkali etched wafers are used for texturing. From this conventional etching process, $7{\sim}10{\mu}m$-sized random pyramids are formed. In this study, acid etching for removal of saw damages was practiced before texturing. This improved the resulting surface morphology, which consisted of $2{\sim}4{\mu}m$-sized pyramids. Because these pyramids covered the surface much more extensively, we obtained reduction of optical losses on the surface. In order to compare with conventional texturing, FE-SEM is used for observing surface morphology and reflectance data is analyzed by UV-VIS spectrophotometer.