Ion-implantation is an advanced technology to inject dopants for shallow junction formation. Due to the ion-induced sputtering effect at low implant energy where dopants tend to accumulate at the silicon surface, the excess ion doses can be easily removed via a surface chemical wet etching process. By taking advantage of the dose limitation characteristic, we proposed a novel method to form shallow emitters with various dopant densities. Two integration flows have been investigated: (1) wet etch after implantation before junction anneal and (2) wet etch after implantation and junction anneal. The two integration flows observed a difference in the density of doping impurities during the thermal process, which is related to the substrate recombination rates. Selective emitter (SE) structures with the two types of integration flows were characterized. Comparing the blanket emitter and SE structures with two types of etching methods, the device with wet etch before annealing process achieved the best effective carrier lifetime of 53.05 μs, which leads to a higher short circuit current density. Hence, this SE cell demonstrated a better blue response and shows an improvement in the conversion efficiency.
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December 2017
Research-Article
A Novel Solar Cell Shallow Emitter Formation Process by Ion-Implantation and Dopant Modulation Through Surface Chemical Etching
Wei-Lin Yang,
Wei-Lin Yang
Institute of Photonics Technologies,
National Tsing Hua University,
Hsinchu 300, Taiwan
e-mail: s9866803@m98.nthu.edu.tw
National Tsing Hua University,
Hsinchu 300, Taiwan
e-mail: s9866803@m98.nthu.edu.tw
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Po-Hung Chen,
Po-Hung Chen
Institute of Photonics Technologies,
National Tsing Hua University,
Hsinchu 300, Taiwan
e-mail: h85245690@yahoo.com.tw
National Tsing Hua University,
Hsinchu 300, Taiwan
e-mail: h85245690@yahoo.com.tw
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Kun-Rui Wu,
Kun-Rui Wu
Institute of Photonics Technologies,
National Tsing Hua University,
Hsinchu 300, Taiwan
e-mail: coxph0100442@gmail.com
National Tsing Hua University,
Hsinchu 300, Taiwan
e-mail: coxph0100442@gmail.com
Search for other works by this author on:
Likarn Wang
Likarn Wang
Institute of Photonics Technologies,
National Tsing Hua University,
Hsinchu 300, Taiwan
e-mail: lkwang@ee.nthu.edu.tw
National Tsing Hua University,
Hsinchu 300, Taiwan
e-mail: lkwang@ee.nthu.edu.tw
Search for other works by this author on:
Wei-Lin Yang
Institute of Photonics Technologies,
National Tsing Hua University,
Hsinchu 300, Taiwan
e-mail: s9866803@m98.nthu.edu.tw
National Tsing Hua University,
Hsinchu 300, Taiwan
e-mail: s9866803@m98.nthu.edu.tw
Po-Hung Chen
Institute of Photonics Technologies,
National Tsing Hua University,
Hsinchu 300, Taiwan
e-mail: h85245690@yahoo.com.tw
National Tsing Hua University,
Hsinchu 300, Taiwan
e-mail: h85245690@yahoo.com.tw
Kun-Rui Wu
Institute of Photonics Technologies,
National Tsing Hua University,
Hsinchu 300, Taiwan
e-mail: coxph0100442@gmail.com
National Tsing Hua University,
Hsinchu 300, Taiwan
e-mail: coxph0100442@gmail.com
Likarn Wang
Institute of Photonics Technologies,
National Tsing Hua University,
Hsinchu 300, Taiwan
e-mail: lkwang@ee.nthu.edu.tw
National Tsing Hua University,
Hsinchu 300, Taiwan
e-mail: lkwang@ee.nthu.edu.tw
Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received August 26, 2016; final manuscript received June 5, 2017; published online August 31, 2017. Assoc. Editor: Wojciech Lipinski.
J. Sol. Energy Eng. Dec 2017, 139(6): 061001 (6 pages)
Published Online: August 31, 2017
Article history
Received:
August 26, 2016
Revised:
June 5, 2017
Citation
Yang, W., Chen, P., Wu, K., and Wang, L. (August 31, 2017). "A Novel Solar Cell Shallow Emitter Formation Process by Ion-Implantation and Dopant Modulation Through Surface Chemical Etching." ASME. J. Sol. Energy Eng. December 2017; 139(6): 061001. https://doi.org/10.1115/1.4037378
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