Title:
BACK-JUNCTION PHOTOELECTRIC CONVERSION ELEMENT AND SOLAR PHOTOVOLTAIC POWER GENERATION SYSTEM
Document Type and Number:
WIPO Patent Application WO/2015/122242
Kind Code:
A1
Abstract:
Provided is a back-junction photoelectric conversion element which is capable of increasing the conversion efficiency by suppressing decrease of the open circuit voltage even in cases where the back surface thereof is provided with recesses and projections. This photoelectric conversion element (10) is provided with a silicon substrate (12), a first semiconductor layer (18), a second semiconductor layer (20), a first electrode (22) and a second electrode (24). The first semiconductor layer (18) has a first conductivity type, and is formed on the back surface side of the silicon substrate (12). The second semiconductor layer (20) has a second conductivity type that is opposite to the first conductivity type, and is formed on the back surface side of the silicon substrate (12). The first electrode (22) is formed in contact with the first semiconductor layer (18). The second electrode (24) is formed in contact with the second semiconductor layer (20). A region of the back surface of the silicon substrate (12), where the first semiconductor layer (18) is formed, is provided with recesses and projections. Another region of the back surface of the silicon substrate (12), where the second semiconductor layer (20) is formed, has an average surface roughness (Ra) of 0.75 nm or less.
Inventors:
TSUJINO KAZUYA
KAMIKAWA TAKESHI
HARADA MASATOMI
KOIDE NAOKI
OKAMOTO CHIKAO
KAMIKAWA TAKESHI
HARADA MASATOMI
KOIDE NAOKI
OKAMOTO CHIKAO
Application Number:
PCT/JP2015/051340
Publication Date:
August 20, 2015
Filing Date:
January 20, 2015
Export Citation:
Assignee:
SHARP KK (JP)
International Classes:
H01L31/0224; H01L31/0236
Domestic Patent References:
| WO2012132615A1 | 2012-10-04 | |||
| WO2013096500A1 | 2013-06-27 |
Foreign References:
| JP2013187287A | 2013-09-19 | |||
| JP2014007284A | 2014-01-16 | |||
| JP2013128095A | 2013-06-27 | |||
| JP2012521078A | 2012-09-10 |
Attorney, Agent or Firm:
KAWAKAMI Keiko et al. (JP)
Keiko Kawakami (JP)
Keiko Kawakami (JP)
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