Tungsten oxide/PEDOT:PSS hybrid cascade hole extraction layer for polymer solar cells with enhanced long-term stability and power conversion efficiency.

Autor:	Kim, Wanjung1,2, Kyu Kim, Jung2, Lim, Younhee3, Park, Insun3, Suk Choi, Yeong3, Hyeok Park, Jong1,2 lutts@skku.edu
Předmět:	*Energy conversion *Solar cell efficiency *Extraction (Chemistry) Tungsten oxides Chemical stability Hybrid systems Organic light emitting diodes
Zdroj:	Solar Energy Materials & Solar Cells. Mar2014, Vol. 122, p24-30. 7p.
Abstrakt:	Abstract: In recent years, alternatives to PEDOT:PSS, which is used in organic light-emitting diodes and polymer solar cells (PSCs), have been actively researched due to its disadvantages in terms of device stability. Nevertheless, PEDOT:PSS is still one of most powerful materials due to its good conductivity, low-temperature processability, and suitable work function that is well-matched with the HOMO energy levels of most donor polymers. In this study, an ultra-thin tungsten oxide/PEDOT:PSS hybrid hole extraction layer (H-HEL) is designed to take advantage of the benefits of PEDOT:PSS and address the device stability problems of PEDOT:PSS. Device stability is dramatically improved and power conversion efficiency is slightly improved in P3HT:PC60BM model system according to the ISOS-D-1 protocol. In order to understand this phenomenon, time-dependent photocurrent–voltage (J–V) measurements are conducted for device stability combined with atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), and ultraviolet photoelectron spectroscopy (UPS) studies. [Copyright &y& Elsevier]
Databáze:	GreenFILE
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