Improvement of Jsc in a Cu2ZnSnS4 Solar Cell by Using a Thin Carbon Intermediate Layer at the Cu2ZnSnS4/Mo Interface

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• 作者：Fangzhou Zhou ; Fangqin Zeng ; Xu Liu ; Fangyang Liu ; Ning Song ; Chang Yan ; Aobo Pu ; Jongsung Park ; Kaiwen Sun ; Xiaojing Hao
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：October 21, 2015
• 年：2015
• 卷：7
• 期：41
• 页码：22868-22873
• 全文大小：410K
• ISSN：1944-8252

文摘

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鈥揼el) and vacuum (sputtering) methods. Specifically, for the sol鈥揼el based process, J_sc increases from 13.60 to 16.96 mA/cm² and efficiency from 4.47% to 5.52%, while for the sputtering based process, J_sc increases from 17.50 to 20.50 mA/cm² 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).