Abstract
AbstractWe have developed two new electron acceptors NAP‐C60 and N4 derived from naphthalene and fluorene, respectively for solution processed organic solar cells. In the case of NAP‐C60, [6, 6]‐phenyl C61‐butyric acid methyl ester (PC61BM) basic structure is modified by replacing its phenyl group with naphthalene group; while in the case of N4, diaryl fullerene structure was modified using fluorene group. The UV‐visible spectra of the molecules show strong absorption in the UV region. Cyclic‐voltammetry measurements yielded the highest occupied molecular orbital and lowest unoccupied molecular orbital energy levels of N4 and NAP‐C60 molecules as (‐5.63 eV, −3.69 eV) and (5.80 eV, −3.70 eV), respectively. The best solar cell devices made from PTB7:NAP‐C60 and PTB7:N4 bulk composite films resulted in power conversion efficiencies of 4.1 and 4.3 %, respectively. The diarylmethanofullerene derivative N4 shows a higher open circuit voltage compared to the methanofullerene derivative NAP‐C60, attributed to low lying LUMO levels of N4.
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