Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 41, Pages 22868-22873Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b05652
Keywords
Cu2ZnSnS4 (CZTS); kesterite; back contact; carbon; thin film; solar cells
Funding
- Australian Government through the Australian Renewable Energy Agency (ARENA)
- Australian Government through Australian Research Council (ARC)
- Guodian New Energy Technology Research Institute, China Guodian Corporation
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Back contact modification plays an important role in improving energy conversion efficiency of Cu2ZnSnS4 (CZTS) thin film solar cells. In this paper, an ultrathin carbon layer is introduced on molybdenum (Mo)-coated soda lime glass (SLG) prior to the deposition of CZTS precursor to improve the back contact and therefore enhance CZTS solar cell efficiency. By introducing this layer, the short circuit current (J(sc)) and device conversion efficiency increase for both nonvacuum (sol-gel) and vacuum (sputtering) methods. Specifically, for the sol-gel based process, Js, increases from 13.60 to 16.96 mA/cm(2) and efficiency from 4.47% to 5.52%, while for the sputtering based process, J(sc) increases from 17.50 to 20.50 mA/cm(2) and efficiency from 4.10% to 5.20%. Furthermore, introduction of this layer does not lead to any deterioration of either open circuit voltage (V-oc) or fill factor (FF).
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