Self-assembled Monolayer Enables HTL-free Organic Solar Cells with 18% Efficiency and Improved Operational Stability
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ArticleAuthors
Lin, YuanbaoFirdaus, Yuliar

Isikgor, Furkan Halis

Nugraha, Mohamad Insan
Yengel, Emre

Harrison, George T
Hallani, Rawad
El Labban, Abdulrahman

Faber, Hendrik

Ma, Chun

Zheng, Xiaopeng
Subbiah, Anand Selvin
Howells, Calvyn Travis
Bakr, Osman

McCulloch, Iain

De Wolf, Stefaan

Tsetseris, Leonidas
Anthopoulos, Thomas D.

KAUST Department
Chemical Science ProgramFunctional Nanomaterials Lab (FuNL)
KAUST Catalysis Center (KCC)
KAUST Solar Center (KSC)
Material Science and Engineering
Material Science and Engineering Program
Physical Science and Engineering (PSE) Division
KAUST Grant Number
OSR2018-CARF/CCF-3079Date
2020-08-18Online Publication Date
2020-08-18Print Publication Date
2020-09-11Embargo End Date
2021-08-18Permanent link to this record
http://hdl.handle.net/10754/664824
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We report on bulk-heterojunction (BHJ) organic photovoltaics (OPVs) using the self-assembled monolayer (SAM) 2PACz as a hole-selective interlayer functionalized directly onto the indium tin oxide (ITO) anode. The 2PACz is found to change the work function of ITO while simultaneously affecting the morphology of the BHJ deposited atop. Cells with PM6:N3 BHJ and ITO-2PACz anode exhibit a power conversion efficiency (PCE) of 16.6%, which is higher than that measured for bare ITO (6.45%) and ITO/PEDOT:PSS (15.94%) based devices. The enhanced performance is attributed to lower contact-resistance, reduced bimolecular recombination losses, and improved charge transport within the BHJ. Importantly, the ITO-2PACz-based OPVs show a dramatically improved operational stability when compared with PEDOT:PSS-based cells. When the ITO-2PACz anode is combined with the ternary PM6:BTP-eC9:PC71BM BHJ, the resulting cells exhibit a maximum PCE of 18.03%, further highlighting the potential of engineered SAMs for use in hole-selective contacts in high-performance OPVs.Citation
lin, yuanbao, Firdaus, Y., Isikgor, F. H., Nugraha, M. I., Yengel, E., Harrison, G. T., … Anthopoulos, T. D. (2020). Self-assembled Monolayer Enables HTL-free Organic Solar Cells with 18% Efficiency and Improved Operational Stability. ACS Energy Letters. doi:10.1021/acsenergylett.0c01421Sponsors
This publication is based upon work supported by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No: OSR2018-CARF/CCF-3079. L. T. acknowledges support for the computational time granted from GRNET in the National HPC facility -ARIS - under project STEM-2.Publisher
American Chemical Society (ACS)Journal
ACS Energy LettersAdditional Links
https://pubs.acs.org/doi/10.1021/acsenergylett.0c01421ae974a485f413a2113503eed53cd6c53
10.1021/acsenergylett.0c01421