2012
DOI: 10.1002/adfm.201200729
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Synthesis of a Modified PC70BM and Its Application as an Electron Acceptor with Poly(3‐hexylthiophene) as an Electron Donor for Efficient Bulk Heterojunction Solar Cells

Abstract: A simple and effective modifi cation of phenyl-C 70 -butyric acid methyl ester (PC 70 BM) is carried out in a single step after which the material is used as electron acceptor for bulk heterojunction polymer solar cells (PSCs). The modifi ed PC 70 BM, namely CN-PC 70 BM, showed broader and stronger absorption in the visible region (350-550 nm) of the solar spectrum than PC 70 BM because of the presence of a cyanovinylene 4-nitrophenyl segment. The lowest unoccupied molecular energy level (LUMO) of CN-PC 70 BM … Show more

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Cited by 40 publications
(24 citation statements)
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“…In this respect, new fullerene electron acceptors have been designed by adding CS as a substituent. Sharma and co‐workers have been productive in this field and they have reported the modification of [6,6]‐phenyl‐C61‐butyric acid methyl ester ( PCBM ) and [6,6]‐phenyl‐C71‐butyric acid methyl ester ( PC70BM ) with nitro‐CS to increase the LUMO level to obtain broader and stronger absorption spectra. As a result, the cells performed better than standard PCBM cells under the same conditions (4.23% vs 2.93% for PCBM and 4.88% vs 3.23% for PC70BM ).…”
Section: Solid‐state: Polycrystalline Powders Single Crystals and Tmentioning
confidence: 99%
“…In this respect, new fullerene electron acceptors have been designed by adding CS as a substituent. Sharma and co‐workers have been productive in this field and they have reported the modification of [6,6]‐phenyl‐C61‐butyric acid methyl ester ( PCBM ) and [6,6]‐phenyl‐C71‐butyric acid methyl ester ( PC70BM ) with nitro‐CS to increase the LUMO level to obtain broader and stronger absorption spectra. As a result, the cells performed better than standard PCBM cells under the same conditions (4.23% vs 2.93% for PCBM and 4.88% vs 3.23% for PC70BM ).…”
Section: Solid‐state: Polycrystalline Powders Single Crystals and Tmentioning
confidence: 99%
“…Subsequent dibromination followed by a double elimination with lithium diisopropylamide afforded dibenzocyclooctynol (DIBO) in moderate yield . In a separate step, the methyl ester of PC 61 BM was converted to the corresponding acid via hydrolysis . Esterifying this acid with DIBO in the presence of N,N ′‐diisopropylcarbodiimide yielded the click‐ready fullerene derivative PC 61 B‐DIBO …”
Section: Resultsmentioning
confidence: 99%
“…The P3HT: CN- [70]PCBM blend showed a PCE of 4.88%, which is higher than that of devices based on [70]PCBM as the electron acceptor (3.23%). An increase in both the J sc and the V oc were noted thanks to the stronger light absorption of CN- [70]PCBM and a LUMO level higher by 0.15 eV compared to that of [70]PCBM [89].…”
Section: -P5 Epj Photovoltaicsmentioning
confidence: 93%