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Lee, Hongseuk,Kim, Areum,Kwon, Hyeok-Chan,Yang, Wooseok,Oh, Yunjung,Lee, Daehee,Moon, Jooho American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.43
<P>We demonstrated crystallization retardation of CH3NH3PbI3 thin film during single coating of precursor solution by simple addition of NaCl. NaCl was codissolved into a precursor mixture solution containing PbI2 and methylammonium iodide (MAI). Dissolved NaCl interacted with the PbI2 in solution and produced a stable intermediate phase, which was converted to a full coverage uniform perovskite absorber layer via reaction with MAI during a single spin-coating. The resulting planar-structure perovskite solar cell made from NaCl-supplemented precursor solution showed a 48% improvement in power conversion efficiency (PCE) (maximum value 15.16%) over the device fabricated without the additive. Our NaCl-supplemented single coating represents an easy approach to effectively obtain highly reproducible uniform performance at an overall position in 5 cm x 5 cm sized cells (divided into 20 subcells with an active area of 0.06 cm(2)) with average PCEs of 12.00 +/- 0.48%.</P>
이재종,최대봉,박현구,곽성조,박홍석 한국공작기계학회 2000 한국공작기계학회 추계학술대회논문집 Vol.2000 No.-
In metal cutting, the machining accuracy is more affected by thermal errors than by geometric errors. This paper models of the thermal errors for error analysis and develops on-the-machine measurement system by which the volumetric error are measured and compensated. The thermal error is modeled by means of angularity errors of a column and thermal drift error of the spindle unit which are measured by the touch probe unit with a star type styluses, a designed spherical ball artifact, and five gap sensors. In order to analyze the thermal characteristics under several operating conditions, experiments performed with the touch probe unit and five gap sensors on the vertical and horizontal machining centers.
Oh, Yunjung,Woo, Kyoohee,Lee, Daehee,Lee, Hongseuk,Kim, Kyujin,Kim, Inhyuk,Zhong, Zhaoyang,Jeong, Sunho,Moon, Jooho American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.20
<P>Recently, environmental-friendly, solution-processed, flexible Cu(In,Ga)(S,Se)<SUB>2</SUB> devices have gained significant interest, primarily because the solution deposition method enables large-scale and low-cost production of photovoltaics, and a flexible substrate can be implemented on uneven surfaces in various applications. Here, we suggest a novel green-chemistry aqueous ink that is readily achievable through the incorporation of molecular precursors in an aqueous medium. A copper formate precursor was introduced to lower the fabrication temperature, provide compatibility with a polyimide plastic substrate, and allow for high photovoltaic performance. Through a comparative spectroscopic study on temperature-dependent chemical/crystal structural evolution, the chemical role of copper formate was elucidated, which led to the chalcopyrite framework that was appropriate to low-temperature annealed Cu(In,Ga)S<SUB>2</SUB> absorber layers at 400 °C. This Cu(In,Ga)S<SUB>2</SUB> solar cell exhibited a power conversion efficiency of 7.04% on a rigid substrate and 5.60% on a polymeric substrate. Our cell on the polymeric substrate also demonstrated both acceptable mechanical flexibility and durability throughout a repeated bending test of 200 cycles.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-20/am504194t/production/images/medium/am-2014-04194t_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am504194t'>ACS Electronic Supporting Info</A></P>