title: Optimization of selective emitter fabrication method for solar cells using a laser grooving.
abstract: In this paper, screen-printing laser grooved buried contact (LGBC) method was applied, which is compatible with the existing screen-printed solar cell equipment and facilities. Experiments were performed in order to optimize short circuit current (I(sc)), open circuit voltage (V(oc)) and fill factor of high efficiency solar cells. To enhance I(sc), V(oc) and efficiency, heavy doping was performed at low sheet resistance in the laser grooved region of the cell. In contrast, light doping was carried out at a high sheet resistance in the non-laser grooved region. To increase fill factor, porous silicon found on the wafer after dipping in an HF solution to remove SiN(x), was cleared. The fabricated screen-printing LGBC solar cell using a 125 mm x 125 mm single crystalline silicon wafer exhibited an efficiency of 17.2%. The results show that screen-printing LGBC method can be applied for high efficiency solar cells.
authors.affiliation: School of Information and Communication Engineering, Sungkyunkwan University, 300 Cheoncheon-dong, Jangan-gu, Suwon 440-746, Korea.
authors.forename: W W
authors.initials: WW
authors.lastname: Jung
authors.forename: S C
authors.initials: SC
authors.lastname: Kim
authors.forename: S W
authors.initials: SW
authors.lastname: Jung
authors.forename: I Y
authors.initials: IY
authors.lastname: Moon
authors.forename: K
authors.initials: K
authors.lastname: Kumar
authors.forename: Y W
authors.initials: YW
authors.lastname: Lee
authors.forename: S Y
authors.initials: SY
authors.lastname: Kim
authors.forename: M K
authors.initials: MK
authors.lastname: Ju
authors.forename: S K
authors.initials: SK
authors.lastname: Han
authors.forename: J
authors.initials: J
authors.lastname: Yi