Abstract
This study quantitatively compares the characteristics of ablation processes using nanosecond (ns) and picosecond (ps) pulse width green (532. nm) lasers. The laser ablation results are analyzed using Electron Probe Micro Analyzer (EPMA), quasi-steady-state photo-conductance (QSSPC) measurements and transmission electron microscopy (TEM). The ablated using the ns green laser is predominantly melted, due to the relatively longer pulse width, and laser damage is incurred to a depth of 2.5. μm. Meanwhile, the laser ablation using the ps green laser precisely removes the thin layers on the surface without severely melting the sample and the observed laser damage depth is almost negligible. However, since the maximum damage depth (~2.5. μm) using the ns laser is much shallower than the local contact depth (10-17. μm), the passivated emitter and rear cell (PERC) efficiencies using the ns and ps pulse width lasers converge to a power conversion efficiency of 19.4%.
Original language | English |
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Pages (from-to) | 208-213 |
Number of pages | 6 |
Journal | Solar Energy |
Volume | 110 |
DOIs | |
Publication status | Published - 2014 Dec 1 |
Bibliographical note
Funding Information:This work was supported by the National Research Foundation of Korea Grant funded by the Korean Government (MSIP)” (2014, University-Institute cooperation program); by the Human Resources Development program (No. 20124030200120) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) Grant funded by the Korea government Ministry of Trade, Industry and Energy.
Publisher Copyright:
© 2014 Elsevier Ltd.
Keywords
- Laser ablation
- Nanosecond pulse width
- PERC cell
- Picosecond pulse width
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- General Materials Science