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Surface engineering of the electron collecting layers for high performance organic photovoltaic cells
- Surface engineering of the electron collecting layers for high performance organic photovoltaic cells
- Lim J.W.; Shim J.W.; Chung K.; Kim D.H.; Choi W.K.; Hwang D.K.
- Ewha Authors
- SCOPUS Author ID
- Issue Date
- Journal Title
- Current Applied Physics
- vol. 17, no. 11, pp. 1476 - 1482
- Electron collecting layers; Organic solar cell; Surface engineering
- Elsevier B.V.
- SCI; SCIE; SCOPUS; KCI
- Surface engineering of the electron collecting layers (ECLs) is a straightforward and practical strategy to develop high performance inverted structure organic solar cells (OSCs). Here, we systematically investigate four different types of surface modified ECLs to implement high performance low-energy band gap poly[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-bA]dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b]-thiophenediyl] (PTB7) and [6,6]-phenyl-C70-butyric acid methyl ester (PC70BM) based inverted OSCs: (1) single PEIE, (2) ZnO:PEIE mixture (1:1 vol ratio), (3) PEIE/ZnO bilayer, and (4) ZnO/PEIE bilayer. OSCs with the ZnO/PEIE ECL show the highest power conversion efficiency (PCE) value of 8.61% while all the other devices exhibit PCE values of less than 7.80%. The excellent surface coverage as well as proper band alignment of the ZnO/PEIE bilayer leads to the highest device performance. © 2017 Elsevier B.V.
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