Publication Type |
pre-print |
School or College |
College of Engineering |
Department |
Materials Science & Engineering |
Creator |
Scarpulla, Michael |
Other Author |
Simonds, Brian J.; Palekis, Vasilios; Van Devener, Brian; Ferekides, Christos |
Title |
Pulsed laser induced ohmic back contact in CdTe solar cells |
Date |
2014-01-01 |
Description |
Creating an ohmic back contact has long been a problem for making efficient CdTe solar cells. Current devices utilize some combination of preferential chemical etching, buffer layer, and Cu doping with additional cost, time, and complexity added for each step. In this Letter, these processes are eschewed and replaced with a nanosecond pulsed ultraviolet laser treatment. It is shown that this treatment can eliminate the rollover effect seen in photovoltaic current-voltage (J-V) curves that is indicative of a non-ohmic back contact. Transfer length measurements show that a single UV laser pulse can reduce the specific contact resistivity by a factor of 24 versus untreated samples. X-Ray photoemission spectroscopy shows evidence of increased conductivity and of elemental Te created at the surface by laser pulses. Finally, finite element modeling is used to model the laser-sample interaction, which predicts both the temperature and the amounts of Cd and Te lost during a laser pulse. |
Type |
Text |
Publisher |
American Institute of Physics (AIP) |
Volume |
104 |
Issue |
14 |
Language |
eng |
Bibliographic Citation |
Simonds, B. J., Palekis, V., Van Devener, B., Ferekides, C., & Scarpulla, M. A. (2014). Pulsed laser induced ohmic back contact in CdTe solar cells. Applied Physics Letters, 104(14), 141604. |
Rights Management |
(c)American Institute of Physics. The following article appeared in Simonds, B. J., Palekis, V., Van Devener, B., Ferekides, C., & Scarpulla, M. A. (2014). Pulsed laser induced ohmic back contact in CdTe solar cells. Applied Physics Letters, 104(14), 141604, 2014. and may be found at (URL/link for published article abstract). |
Format Medium |
application/pdf |
Format Extent |
769,210 bytes |
Identifier |
uspace,18663 |
ARK |
ark:/87278/s6rv3xt1 |
Setname |
ir_uspace |
ID |
712533 |
Reference URL |
https://collections.lib.utah.edu/ark:/87278/s6rv3xt1 |