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Li, Chang-Zhi,Chueh, Chu-Chen,Yip, Hin-Lap,O'Malley, Kevin M.,Chen, Wen-Chang,Jen, Alex K.-Y. The Royal Society of Chemistry 2012 Journal of materials chemistry Vol.22 No.17
<P>Two methanol-soluble fullerene surfactants have been developed as interfacial layers for cathodes in polymer solar cells. These surfactants facilitate the tuning of cathode work function and extraction of electrons that significantly enhance open-circuit voltage and photocurrent generation. The performance of bulk heterojunction solar cells based on using these surfactant-modified cathodes improved significantly to afford high power conversion efficiencies (as high as 6.63% for a Ag cathode).</P> <P>Graphic Abstract</P><P>Methanol-soluble fullerene surfactants as interfacial layers for cathodes in polymer solar cells afforded a high PCE of 6.63% for a Ag cathode. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2jm30755c'> </P>
Li, Chang-Zhi,Chien, Shang-Chieh,Yip, Hin-Lap,Chueh, Chu-Chen,Chen, Fang-Chung,Matsuo, Yutaka,Nakamura, Eiichi,Jen, Alex K.-Y. Royal Society of Chemistry 2011 Chemical communications Vol.47 No.36
<P>A facile synthesis was employed to make a 56π-electron methano-PC<SUB>61</SUB>BM with a very small 1,2-dihydromethano (CH<SUB>2</SUB>) group. This new fullerene derivative possesses high electron mobility (0.014 cm<SUP>2</SUP> V<SUP>−1</SUP> s<SUP>−1</SUP>) and higher LUMO energy level (0.15 eV) than PC<SUB>61</SUB>BM. Bulk hetero-junction devices based on using poly(3-hexylthiophene) and methano-PC<SUB>61</SUB>BM as active layer exhibited better performance and thermal stability than those using the PC<SUB>61</SUB>BM analogue.</P> <P>Graphic Abstract</P><P>We have designed and synthesized a new 56π-electron methano-PC<SUB>61</SUB>BM using a very small and stable 1,2-dihydromethano (CH<SUB>2</SUB>) group. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1cc14446d'> </P>