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Thieno[3,2‐ b ]thiophene‐diketopyrrolopyrrole Containing Polymers for Inverted Solar Cells Devices with High Short Circuit Currents
Author(s) -
Bronstein Hugo,
ColladoFregoso Elisa,
Hadipour Afshin,
Soon Ying W.,
Huang Zhenggang,
Dimitrov Stoichko D.,
Ashraf Raja Shahid,
Rand Barry P.,
Watkins Scott E.,
Tuladhar Pabitra S.,
Meager Iain,
Durrant James R.,
McCulloch Iain
Publication year - 2013
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.201300287
Subject(s) - materials science , polymer solar cell , organic solar cell , fullerene , thiophene , polymer , conjugated system , short circuit , photovoltaics , solar cell , optoelectronics , chemical engineering , analytical chemistry (journal) , photovoltaic system , organic chemistry , voltage , composite material , chemistry , ecology , physics , quantum mechanics , engineering , biology
The synthesis and characterization four diketopyrrolopyrrole containing conjugated polymers for use in organic photovoltaics is presented. Excellent energy level control is demonstrated through heteroatomic substitution whilst maintaining similar solid state properties as shown by X‐ray diffraction and atomic force microscopy. Inverted solar cells were fabricated with the best devices having short circuit currents exceeding 16 mA cm −2 and efficiencies of over 5% irrespective of whether [6,6]‐phenyl‐C 61 ‐butyric acid methyl ester (PC 60 BM) or [6,6]‐phenyl‐C 71 ‐butyric acid methyl ester (PC 70 BM) is used. Transient absorption spectroscopy on the bulk heterojunction blends shows efficient charge photo‐generation, with the variations in short circuit current correlated to the energetic offset between polymer and fullerene.