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Spin‐ and Spray‐Deposited Single‐Walled Carbon‐Nanotube Electrodes for Organic Solar Cells
Author(s) -
Kim Sungsoo,
Yim Jonghyuk,
Wang Xuhua,
Bradley Donal D.C.,
Lee Soonil,
deMello John C.
Publication year - 2010
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200902369
Subject(s) - materials science , pedot:pss , carbon nanotube , spin coating , chemical engineering , thin film , pulmonary surfactant , organic solar cell , substrate (aquarium) , analytical chemistry (journal) , nanotechnology , composite material , organic chemistry , polymer , oceanography , chemistry , geology , engineering
Organic bulk‐heterojunction solar cells using thin‐film single‐walled carbon‐nanotube (SWCNT) anodes deposited on glass are reported. Two types of SWCNT films are investigated: spin‐coated films from dichloroethane (DCE), and spray‐coated films from deionized water using sodium dodecyl sulphate (SDS) or sodium dodecyl benzene sulphonate (SDBS) as the surfactant. All of the films are found to be mechanically robust, with no tendency to delaminate from the underlying substrate during handling. Acid treatment with HNO 3 yields high conductivities >1000 S cm −1 for all of the films, with values of up to 7694 ± 800 S cm −1 being obtained when using SDS as the surfactant. Sheet resistances of around 100 Ω sq −1 are obtained at reasonable transmission, for example, 128 ± 2 Ω sq −1 at 90% for DCE, 57 ± 3 Ω sq −1 at 65% for H 2 O:SDS, and 68 ± 5 Ω sq −1 at 70% for H 2 O:SDBS. Solar cells are fabricated by successively coating the SWCNT films with poly(3,4‐ethylenedioxythiophene):poly(styrene sulphonate) (PEDOT:PSS), a blend of regioregular poly(3‐hexylthiophene) (P3HT) and 1‐(3‐methoxy‐carbonyl)‐propyl‐1‐phenyl‐(6,6)C 61 (PCBM), and LiF/Al. The resultant devices have respective power conversions of 2.3, 2.2 and 1.2% for DCE, H 2 O:SDS and H 2 O:SDBS, with the first two being at a virtual parity with reference devices using ITO‐coated glass as the anode (2.3%).