Two-Dimensional WS2 Sheets as Interfacial Layer for High-Performance Organic Solar Cells
Received date: 2015-04-10
Online published: 2015-06-02
Supported by
Project supported by Zhejiang Provincial Natural Science Foundation of China (Youth Talent Program: R4110030), the Program for New Century Excellent Talents in University (No. NCET-12-0494), the Research Fund for the Doctoral Program of Higher Education (No. 20130101110123) and the Program for 14th China-Japan S&T Cooperation (No. 2013DFG52800).
Two-dimensional layered WS2 sheets is used as the hole extraction layer (HEL) in organic solar cells (OSCs). We find that UV-ozone treatment of the chemically exfoliated WS2 sheets can significantly improve the device performance of the OSCs with the power conversion efficiency (PCE) of about 8.37%, which is comparable to the OSCs with the standard PEDOT:PSS as the HEL. We attribute the improvement to the incorporation of oxygen into the lattice of the WS2 sheets. The oxygen incorporation reduces the lattice vacancies of WS2 sheets and makes the WS2 partially oxidized and consequently improves the electrical properties of the WS2 sheets.
Ma Chunyan , Fu Weifei , Huang Guowei , Chen Hongzheng , Xu Mingsheng . Two-Dimensional WS2 Sheets as Interfacial Layer for High-Performance Organic Solar Cells[J]. Acta Chimica Sinica, 2015 , 73(9) : 949 -953 . DOI: 10.6023/A15040246
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