4.8 Article

Efficiency improvement using bis(trifluoromethane) sulfonamide lithium salt as a chemical additive in porphyrin based organic solar cells

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NANOSCALE
卷 8, 期 41, 页码 17953-17962

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ROYAL SOC CHEMISTRY
DOI: 10.1039/c6nr06374h

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资金

  1. MINECO, Spain [CTQ2013-48252-P]
  2. Junta de Comunidades de Castilla-La Mancha, Spain [PEII-2014-014-P]
  3. Fundacion Carolina
  4. Severo Ochoa Excellence Accreditation [2014.20188SEV-2103-0319]
  5. LNMIIT
  6. [CTQ-2013-47183-R]
  7. [AGAUR 2014 SGR-763]
  8. ICREA Funding Source: Custom

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Two new conjugated acceptor-pi-donor-pi-acceptor (A-pi-D-pi-A) porphyrins have been synthesised using 3-ethylrhodanine (1a) or dicyanovinylene (1b) groups as acceptor units. Their optical and electrochemical properties made these materials excellent electron donors along with PC71BM as the acceptor for solution-processed bulk heterojunction organic solar cells. The devices based on 1a:PC71BM (1:2) and 1b:PC71BM (1 : 2) processed with CB showed low power conversion efficiencies (PCE) of 2.30% and 2.80%, respectively. Nonetheless, after processing the active layer using a mixture of 3 vol% of a pyridine additive in THF, the PCE was enhanced up to 5.14% and 6.06% for 1a:PC71BM and 1b:PC71BM, respectively. Moreover, when we used LiTFSI as the chemical additive in pyridine/CB-processed 1b:PC71BM an excellent PCE of 7.63% was recorded. The effects over the film morphology and the device characteristics (J(sc), V-oc and FF) due to the introduction of LiTFSI are discussed.

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