期刊
ACS APPLIED MATERIALS & INTERFACES
卷 1, 期 6, 页码 1154-1158出版社
AMER CHEMICAL SOC
DOI: 10.1021/am900116p
关键词
green solar cell; donor-acceptor; bulk heterojunction; conjugated polymers; low band gap
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 theodonor 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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