Department of Physics
Poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) hole contact is widely used in organic solar cells (OSCs). In this work, we report the effort to develop a versatile solution-processed molybdenum trioxide (s-MoO3)/Au nanoparticles (NPs)/s-MoO3 (MAM) hole contact for application in PEDOT:PSS-free OSCs. The use of Au NPs is to improve the adhesion between the two s-MoO3 layers in the MAM hole contact. It shows that MAM hole contact enables to enhance the charge extraction through suppression of bimolecular recombination, and reduce the leakage current by improvement of contact property. Power conversion efficiency of 7.68% was obtained for MAM-based OSCs, with a blend system of poly[[4,8-bis[(2-ethylhexyl) oxy]benzo[1,2-b: 4,5-b’] dithiophene-2,6-diyl] [3-fluoro-2-[(2-ethylhexyl) carbonyl] thieno[3,4-b]-thiophenediyl]]: [6,6]- phenyl-C70-butyric-acid-methyl-ester, which is comparable to that of the PEDOT:PSS-based cells (7.48%). It demonstrates clearly that solution-processed MAM hole contact can be readily adopted to replace the widely used acidic PEDOT:PSS hole contact for application in PEDOT:PSS-free OSCs.
Solution-processed oxide, Hole contact, PEDOT:PSS-free, Charge collection efficiency, Absorption enhancement, Organic solar cells
Source Publication Title
© 2017 Elsevier B.V. All rights reserved.
This work was financially supported by the Research Grants Council of Hong Kong Special Administrative Region, China, General Research Fund (GRF/12303114, 12302817), Inter-institutional Collaborative Research Scheme (RC-ICRS/15-16/04) and Shenzhen Peacock Plan (KQTD20140630110339343).
Link to Publisher's Edition
Zhang, W., Lan, W., Lee, M., Singh, J., & Zhu, F. (2018). A versatile solution-processed MoO3/Au nanoparticles/MoO3 hole contact for high performing PEDOT:PSS-free organic solar cells. Organic Electronics, 52, 1-6. https://doi.org/10.1016/j.orgel.2017.10.005