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Efficiency improvement using bis(trifluoromethane) sulfonamide lithium salt as a chemical additive in porphyrin based organic solar cells.
Nanoscale 2016 October 21
Two new conjugated acceptor-π-donor-π-acceptor (A-π-D-π-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 PC71 BM as the acceptor for solution-processed bulk heterojunction organic solar cells. The devices based on 1a:PC71 BM (1 : 2) and 1b:PC71 BM (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:PC71 BM and 1b:PC71 BM, respectively. Moreover, when we used LiTFSI as the chemical additive in pyridine/CB-processed 1b:PC71 BM an excellent PCE of 7.63% was recorded. The effects over the film morphology and the device characteristics (Jsc , Voc and FF) due to the introduction of LiTFSI are discussed.
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