Title: Interface Engineering to Enhance the Efficiency of Conventional Polymer Solar Cells by Alcohol-/Water-Soluble C-60 Materials Doped with Alkali Carbonates
Authors: Lai, Yu-Ying
Shih, Ping-I
Li, Yi-Peng
Tsai, Che-En
Wu, Jhong-Sian
Cheng, Yen-Ju
Hsu, Chain-Shu
Department of Applied Chemistry
Keywords: polymer solar cells;interface engineering;hydrophilic fullerene materials;electron-selective layer;dopant;alkali carbonates
Issue Date: 12-Jun-2013
Abstract: Two new C-60-based n-type materials, EGMC-OH and EGMC-COOH, 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-OH and EGMC COOH can be dissolved in highly polar solvents to implement the polar/nonpolar orthogonal solvent strategy, forming an electron modification layer (EML) without eroding the basis of ITO/PEDOT:PSS/P3HT:PC61M/EML/Ca/Al configuration with the insertion of the EGMC OH and EGMC COOH 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-COOH EML. Compared to the pristine device with a PCE of 3.61%, the devices modified by the Li2CO3-doped EGMC-COOH EML achieved a highest PCE of 4.29%. Furthermore, we demonstrated that the formation of the EGMC-COOH EML can be utilized as a general approach in the fabrication of highly efficient multilayer conventional devices. With the incorporation of the EGMC-COOH doped with 40 wt % Li2CO3, the PCDCTBT-C8:PC17BM-based device exhibited a superior PCE of 4.51%, which outperformed the corresponding nonmodified device with a PCE of 3.63%.
URI: http://dx.doi.org/10.1021/am400962e
ISSN: 1944-8244
DOI: 10.1021/am400962e
Volume: 5
Issue: 11
Begin Page: 5122
End Page: 5128
Appears in Collections:Articles

Files in This Item:

  1. 000320484000085.pdf