New semiconducting polymers are continuously synthesized, with all kinds of new  electronic, chemical, physical, and optical properties. However, the collection of  commercially available fullerene derivatives that can be used in OPV is still limited.PTEG-  1 At Solenne, we have recently developed several new fullerene derivatives, such as  KLOC-6, and we are actively involved in research on other fullerene acceptor materials.  On this page, new compounds and developments will be introduced.new derivatives  Solenne BV – Zernikepark 6 – 9747AN Groningen – The Netherlands – info@solennebv.com Fulleropyrrolidines now added to our catalogue © 2014 Solenne BV  Products – New derivatives Fulleropyrrolidines are used as electron-conducting compounds in various systems. Solenne  produces these materials on a regular basis. Some examples are depicted below. For more  information, availability and prices, click here.   back to products page [60]IPB, [60]IPH, [70]IPB and [70]IPH: replacements for [60]PCBM Together with researchers from Imperial College London, we have developed a new class  of fullerene derivatives than can replace [60]PCBM in polymer:fullerene solar cells and in  perovskite cells, because they give a higher cell efficiency.   Click here for prices of the C60- and C70-derivatives.