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  • Title: Efficient green solar cells via a chemically polymerizable donor-acceptor heterocyclic pentamer.
    Author: Subbiah J, Beaujuge PM, Choudhury KR, Ellinger S, Reynolds JR, So F.
    Journal: ACS Appl Mater Interfaces; 2009 Jun; 1(6):1154-8. PubMed ID: 20355905.
    Abstract:
    In this contribution, we report on bulk-heterojunction solar cells using a solution-processable neutral green conjugated copolymer based on 3,4-dioxythiophene and 2,1,3-benzothiadiazole as the donor and [6,6]phenyl-C61 butyric acid methyl ester (PCBM) as the acceptor. We have found that the short-circuit current is very sensitive to the composition of the donor-acceptor blend and it increases with increasing acceptor concentration. The device with a donor-acceptor ratio of 1:8 gives the best performance with a short-circuit current of 5.56 mA/cm(2), an open-circuit voltage of 0.77 V, and a power conversion efficiency of 1.9% under AM 1.5 solar illumination. The incident photon-to-current efficiency (IPCE) of the green solar cells shows two bands, one with a maximum of 57% in the UV region corresponding to absorption of PCBM and a second one with a maximum of 42% at longer wavelengths corresponding to the absorption of the green polymer.
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