Highly efficient organic solar Cells based on a robust room-temperature solution-processed copper iodide hole transporter
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ArticleAuthors
Zhao, Kui
Ngongang Ndjawa, Guy Olivier

Jagadamma, Lethy Krishnan

El Labban, Abdulrahman

Hu, Hanlin

Wang, Qingxiao
Li, Ruipeng
Abdelsamie, Maged

Beaujuge, Pierre

Amassian, Aram

KAUST Department
Electron MicroscopyImaging and Characterization Core Lab
KAUST Solar Center (KSC)
Material Science and Engineering Program
Office of the VP
Organic Electronics and Photovoltaics Group
Physical Science and Engineering (PSE) Division
Date
2015-07-30Online Publication Date
2015-07-30Print Publication Date
2015-09Permanent link to this record
http://hdl.handle.net/10754/561611
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Achieving high performance and reliable organic solar cells hinges on the development of stable and energetically suitable hole transporting buffer layers in tune with the electrode and photoactive materials of the solar cell stack. Here we have identified solution-processed copper(I) iodide (CuI) thin films with low-temperature processing conditions as an effective hole–transporting layer (HTL) for a wide range of polymer:fullerene bulk heterojunction (BHJ) systems. The solar cells using CuI HTL show higher power conversion efficiency (PCE) in standard device structure for polymer blends, up to PCE of 8.8%, as compared with poly(3,4-ethylenedioxy-thiophene):poly(styrenesulfonate) (PEDOT:PSS) HTL, for a broad range of polymer:fullerene systems. The CuI layer properties and solar cell device behavior are shown to be remarkably robust and insensitive to a wide range of processing conditions of the HTL, including processing solvent, annealing temperature (room temperature up to 200 °C), and film thickness. CuI is also shown to improve the overall lifetime of solar cells in the standard architecture as compared to PEDOT:PSS. We further demonstrate promising solar cell performance when using CuI as top HTL in an inverted device architecture. The observation of uncommon properties, such as photoconductivity of CuI and templating effects on the BHJ layer formation, are also discussed. This study points to CuI as being a good candidate to replace PEDOT:PSS in solution-processed solar cells thanks to the facile implementation and demonstrated robustness of CuI thin films.Citation
Highly efficient organic solar Cells based on a robust room-temperature solution-processed copper iodide hole transporter 2015 Nano EnergyPublisher
Elsevier BVJournal
Nano EnergyAdditional Links
http://linkinghub.elsevier.com/retrieve/pii/S2211285515003110ae974a485f413a2113503eed53cd6c53
10.1016/j.nanoen.2015.07.018