title: Electrostatic-Force-Assisted Dispensing Printing to Construct High-Aspect-Ratio of 0.79 Electrodes on a Textured Surface with Improved Adhesion and Contact Resistivity.
abstract: As a novel route to construct fine and abnormally high-aspect-ratio electrodes with excellent adhesion and reduced contact resistivity on a textured surface, an electrostatic-force-assisted dispensing printing technique is reported and compared with conventional dispensing and electrohydrodynamic jet printing techniques. The electrostatic force applied between a silver paste and the textured surface of a crystalline silicon solar cell wafer significantly improves the physical adhesion of the electrodes, whereas those fabricated using a conventional dispensing printing technique peel off with a silver paste containing 2 wt% of a fluorosurfactant. Moreover, the contact resistivity and dimensionless deviation of total resistance are significantly reduced from 2.19 ± 1.53 mΩ · cm(2) to 0.98 ± 0.92 mΩ · cm(2) and from 0.10 to 0.03, respectively. By utilizing electrodes with an abnormally high-aspect-ratio of 0.79 (the measured thickness and width are 30.4 μm and 38.3 μm, respectively), the cell efficiency is 17.2% on a polycrystalline silicon solar cell with an emitter sheet resistance of 60 Ω/sq. This cell efficiency is considerably higher than previously reported values obtained using a conventional electrohydrodynamic jet printing technique, by +0.48-3.5%p.
authors.affiliation: Department of Graphic Arts Information Engineering, Pukyong National University, 365, Sinseon-ro, Nam-gu, Busan, 608-739, Republic of Korea.
authors.forename: Dong-Youn
authors.initials: DY
authors.lastname: Shin
authors.affiliation: Department of Graphic Arts Information Engineering, Pukyong National University, 365, Sinseon-ro, Nam-gu, Busan, 608-739, Republic of Korea.
authors.forename: Sung-Soo
authors.initials: SS
authors.lastname: Yoo
authors.affiliation: Solar Energy Research Centre, Korea Institute of Energy Research, Daejeon, 305-343, Republic of Korea.
authors.forename: Hee-eun
authors.initials: HE
authors.lastname: Song
authors.affiliation: Enjet Inc., Ltd., 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do, 440-746, Republic of Korea.
authors.forename: Hyowon
authors.initials: H
authors.lastname: Tak
authors.affiliation: Department of Mechanical Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do,440-746, Republic of Korea.
authors.forename: Doyoung
authors.initials: D
authors.lastname: Byun