Study Phase Separation of Donor: Acceptor in Inkjet Printed Thin Films of Bulk Heterojunction Organic Solar Cells Using AFM Phase Imaging

Vivi Fauzia; Akrajas Ali Umar; Muhamad Mat Salleh; Muhammad Yahaya

doi:10.4028/www.scientific.net/AMR.364.465

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 364Study Phase Separation of Donor: Acceptor in...

Study Phase Separation of Donor: Acceptor in Inkjet Printed Thin Films of Bulk Heterojunction Organic Solar Cells Using AFM Phase Imaging

Abstract:

This paper reports an application of Atomic Force Microscopy (AFM) phase imaging to observe the phase separation between electron donor and acceptor materials in bulk heterojunction organic solar cells. The solar cells were fabricated using inkjet printed thin films of blended poly (3-octylthiophene-2,5-diyl)(P3OT) and (6,6)-phenyl C₇₁ butyric acid methyl ester (PC₇₁BM) as donor and acceptor materials respectively. The content PC₇₁BM in the blended was varying from 25, 50 and 75 wt %. The AFM phase images of the thin film which contains 25 wt % PC₇₁BM indicated that the acceptor molecules, PC₇₁BM, are well distributed in the polymer chain of donor material, P3OT. The solar cell contains this film has the highest generated photocurrent. Hence, the phase separation between electron donor and acceptor materials in bulk heterojunction organic solar cells is one essential aspect that influences generation of photocurrent.