The [60]IPX fullerenes give 50 mV higher open circuit voltage than [60]PCBM. In P3HT  solar cells, the efficiency is increased by 10-15% compared to [60]PCBM. These  compounds have recently been publishedPCBB  Solenne BV – Zernikepark 6 – 9747AN Groningen – The Netherlands – info@solennebv.com © 2014 Solenne BV  Products – [60]IPX [60]IPB   R = butyl Quantity Price 0.10 g      40 euro 0.25 g      90 euro 0.50 g     175 euro 1 g    350 euro for larger quantities: inquire Product information (available soon) [60]IPX back to products page [60]IPH   R = hexyl Quantity Price 0.10 g        40 euro 0.25 g        90 euro 0.50 g       175 euro 1 g      350 euro for larger quantities: inquire There are special introduction prices for [60]IPX: Like Solenne BV on Facebook and get a personal offer! The corresponding C70-derivatives [70]IPB and [70]IPH are now  also available. For more information click here.  Publications: A.B. Sieval et al, Chemical Communications 2015, 51, 8126-8129.  L. Gil-Escriq et al, Journal of Materials Chemistry A, 2016, 3667-3672..