IPB is a fullerene derivative of C60 which is used as an electron acceptor material in organic photovoltaic (OPV) solar cells. Comparing with PCBMs, IPX (where X is either B, butyl, H, hexyl, or O, octyl) fullerenes give about 50 mV higher open circuit voltage (VOC). It has been reported that in P3HT solar cells, the efficiency is increased by 10-15% compared to PCBM .
IPX (n = 4, 6, 8) have been also a popular candidate for perovskite solar cells applications .
ITO/PEDOT:PSS (80 nm)/p-TPD (20 nm)/CH3NH3PbI3 (320 nm)/PCBM (50 nm)/Ba:Ag 
ITO/PEDOT:PSS (80 nm)/p-TPD (20 nm)/CH3NH3PbI3(320 nm)/IPB (50 nm)/Ba:Ag 
|JSC (mA cm-2)||15.68||16.28|
|JSC (mA cm-2)||10.66|
|CAS number||1705592-13-7 (1883713-20-9)|
|Molecular weight||964.97 g/mol|
|HOMO/LUMO||No data available; comparable to PCBM (HOMO 6.1 = eV, LUMO = 3.7 eV)|
|Classification / Family||Fullerene derivatives, Electron transport materials (ETM), Acceptor materials, Organic photovoltaics (OPV), Organic electronics|
|Melting point||Not available|
Literature and Reviews
Diels–Alders adducts of C60 and esters of 3-(1-indenyl)-propionic acid: alternatives for
PCBM in polymer:fullerene solar cells, A. B. Sieval et al., Chem. Commun., 51, 8126 (2015);DOI: 10.1039/c5cc01642h.
- Fullerene imposed high open-circuit voltage in efficient perovskite based solar cells, L. Gil-Escrig et al., J. Mater. Chem. A, 4, 3667 (2016); DOI: 10.1039/c5ta10574a.
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