김동섭 교수

Theoretical calculations reveal that the quality of an aluminum–back-surface field (BSF) in a silicon solar cell can be improved by either increasing the thickness of the deposited aluminum (Al), peak alloying temperature, or both. However, this study shows that there is a critical temperature for a given screen-printed Al thickness, above which the BSF quality begins to degrade because of nonuniformity triggered by the agglomeration of Al-Si melt in combination with the bandgap narrowing result

The stable hydrogen isotope deuterium (D), which is released during the annealing of deuterated silicon nitride films, diffuses through the crystalline silicon and is captured by a thin, amorphous layer of silicon sputtered on the rear surface. We report on the measurement of the concentration of “penetrated” D by secondary ion mass spectrometry to monitor the flux of D diffusing through single-crystalline silicon wafers. The penetrated D content in the trapping layer increases with the annealin

Hydrogen (H) released during the annealing of hydrogenated amorphous silicon nitride (SiN <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x</inf> :H) films diffuses through the crystalline silicon and passivates the defects. This study shows that the stable H isotope deuterium (D), which is released during the annealing of deuterated amorphous silicon nitride (SiN <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/199

After producing crystalline Si (c-Si) solar module, the output power of the c-Si module was decreased compared to the total amount of c-Si cells’ power due to the increase of series resistance and the light absorption of the cover glass and encapsulant. We define this power loss as cell to module (CTM) loss and the decreasing power rate as CTM conversion ratio (CR). The typical CTM CR in other groups has a value of about 94%. The CTM CR is typically decreased with increasing the efficiency of so

Porous silicon (PS) as an excellent light diffuser can be used as an antireflection layer without other antireflection coating (ARC) materials. PS layers were obtained by electrochemical etching (ECE) anodization of silicon wafers in hydrofluoric acid/ethanol/de- ionized (DI) water solution (HFlEtOH/H₂O). This technique is based on the selective removal of Si atoms from the sample surface forming a layer of PS with adjustable optical, electrical, and mechanical properties. A PS layer with optima

Indium‐tin‐oxide (ITO)‐electrodes were applied to sintered all‐polycrystalline solar cells for large area cell fabrication. The and layers were prepared by sequentially sintering slurry at 600°C and slurry at 625°C. The length of the cells was fixed at 10 mm and the width was varied from 3 to 9 mm. While the application of ITO did not change the junction properties after a high temperature annealing process, it significantly reduced the series resistance of the cells. As the cell width increased

Boron back surface field is a promising replacement for the industry standard screen-printed Aluminum. However, the use of boron back surface fields is largely confined to laboratory scale solar cells. In order to increase its industrial applicability, we present a method for achieving a high quality boron back surface field using a cheap and safe boron source and short diffusion time. Metal contacts are fabricated using screen-printing, and degradation of rear passivation after contact firing i

The handling of the fallen leaves originated from the roads or the cities would be one of the major issue of urban environment management at autumn. The morphological and the chemical properties of the falen leaves, for example. the brittle structure and the higher contents of inorganic components make it very difficult to utilization as common biomass. In this study, the applicability of the fallen leaves as a soil conditioner was evaluated and the effects of various additives on the functional

Presented at the 14th International Photovoltaic Science and Engineering Conference; Chulalongkorn University, Bangkok, Thailand; January 26-30, 2004.

The reduction of greenhouse gas emission currently becomes more urgent task for Korean Industries, especially for the paper industries because of the new regulation based on the low carbon-green growth law. In order to reduce effectively the greenhouse gas emission, the development of greenhouse gas emission inventory has been widely considered as one of the basic processes and has been applied to many industries. In this study, the fundamental schemes and the cases of greenhouse gas inventories