Abstract

The illuminated current-voltage characteristics of Cu(In,Ga)(S,Se)2 (CIGSSe) thin film solar cells fabricated using two different buffer layer processes: chemical bath deposition (CBD) and atomic layer deposition (ALD) were investigated. The CIGSSe solar cell with the ALD buffer showed comparable conversion efficiency to the CIGSSe solar cell with CBD buffer but lower shunt resistance even though it showed lower point shunt defect density as measured in electroluminescence. The shunt paths were investigated in detail by capturing the high-resolution dark lock-in thermography images, resolving the shunt resistance contributions of the scribing patterns (P1, P3), and depth profiling of the constituent elements. It was found that the concentration of Na from the soda-lime glass substrate played a key role in controlling the shunt paths. In the ALD process, Na segregated at the surface of CIGSSe and contributed to the increase in the shunt current through P1 and P3, resulting in a reduction in the fill factor of the CIGSSe solar cells.

Details

Title
Impact of Buffer Layer Process and Na on Shunt Paths of Monolithic Series-connected CIGSSe Thin Film Solar Cells
Author
Chan, Bin Mo 1 ; Park, Se Jin 2 ; Bae Soohyun 2 ; Mi-hwa, Lim 3 ; Nam Junggyu 3 ; Kim, Dongseop 3 ; Yang JungYup 4 ; Suh Dongchul 5 ; Min Byoung Koun 6   VIAFID ORCID Logo  ; Kim, Donghwan 2 ; Kang Yoonmook 6 ; Young-Su, Kim 3 ; Hae-seok, Lee 6 

1  Korea University, Department of Materials Science and Engineering, Seoul, Republic of Korea (GRID:grid.222754.4) (ISNI:0000 0001 0840 2678); Korea Institute of Industrial Technology, Gangwon Regional Division, Gangneung-Si, Republic of Korea (GRID:grid.454135.2) (ISNI:0000 0000 9353 1134) 
2  Korea University, Department of Materials Science and Engineering, Seoul, Republic of Korea (GRID:grid.222754.4) (ISNI:0000 0001 0840 2678) 
3  Samsung SDI Co., Ltd., Photovoltaic Development Team, Cheonan-Si, Republic of Korea (GRID:grid.419666.a) (ISNI:0000 0001 1945 5898) 
4  Kunsan National University, Department of Physics, Gunsan, Republic of Korea (GRID:grid.411159.9) (ISNI:0000 0000 9885 6632) 
5  Hoseo University, Department of Chemical Engineering, Asan, Republic of Korea (GRID:grid.412238.e) (ISNI:0000 0004 0532 7053) 
6  Graduate School of Energy and Environment, Korea University, KU-KIST Green School, Seoul, Republic of Korea (GRID:grid.222754.4) (ISNI:0000 0001 0840 2678) 
Publication year
2019
Publication date
Dec 2019
Publisher
Nature Publishing Group
e-ISSN
20452322
Source type
Scholarly Journal
Language of publication
English
DOI
https://doi.org/10.1038/s41598-019-38945-5
ProQuest document ID
2188583188
Copyright
This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.