Interface Engineering to Enhance the Efficiency of Conventional Polymer Solar Cells by Alcohol-/Water-Soluble C60 Materials Doped with Alkali Carbonates

详细信息    查看全文

• 作者：Yu-Ying Lai ; Ping-I Shih ; Yi-Peng Li ; Che-En Tsai ; Jhong-Sian Wu ; Yen-Ju Cheng ; Chain-Shu Hsu
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2013
• 出版时间：June 12, 2013
• 年：2013
• 卷：5
• 期：11
• 页码：5122-5128
• 全文大小：357K
• 年卷期：v.5,no.11(June 12, 2013)
• ISSN：1944-8252

文摘

Two new C₆₀-based n-type materials, EGMC鈥揙H and EGMC鈥揅OOH, functionalized with hydrophilic triethylene glycol groups (TEGs), have been synthesized and employed in conventional polymer solar cells. With the assistance of the TEG-based surfactant, EGMC鈥揙H and EGMC鈥揅OOH can be dissolved in highly polar solvents to implement the polar/nonpolar orthogonal solvent strategy, forming an electron modification layer (EML) without eroding the underlying active layer. Multilayer conventional solar cells on the basis of ITO/PEDOT:PSS/P3HT:PC₆₁BM/EML/Ca/Al configuration with the insertion of the EGMC鈥揙H and EGMC鈥揅OOH EML between the active layer and the electrode have thus been successfully realized by cost-effective solution processing techniques. Moreover, the electron conductivity of the EML can be improved by incorporating alkali carbonates into the EGMC鈥揅OOH EML. Compared to the pristine device with a PCE of 3.61%, the devices modified by the Li₂CO₃-doped EGMC鈥揅OOH EML achieved a highest PCE of 4.29%. Furthermore, we demonstrated that the formation of the EGMC鈥揅OOH EML can be utilized as a general approach in the fabrication of highly efficient multilayer conventional devices. With the incorporation of the EGMC鈥揅OOH doped with 40 wt % Li₂CO₃, the PCDCTBT鈥揅8:PC₇₁BM-based device exhibited a superior PCE of 4.51%, which outperformed the corresponding nonmodified device with a PCE of 3.63%.

Keywords:

polymer solar cells; interface engineering; hydrophilic fullerene materials; electron-selective layer; dopant; alkali carbonates