Efficient green solar cells via a chemically polymerizable donor-acceptor heterocyclic pentamer.
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.
Subbiah
Jegadesan
J
Beaujuge
Pierre M
PM
Choudhury
Kaushik Roy
KR
Ellinger
Stefan
S
Reynolds
John R
JR
So
Franky
F
D011211:Electric Power Supplies; D004579:Electron Transport; D004867:Equipment Design; D019544:Equipment Failure Analysis; D055772:Green Chemistry Technology / Q000295:instrumentation*; D006571:Heterocyclic Compounds / Q000737:chemistry* / Q000528:radiation effects; D008027:Light; D008422:Materials Testing; D011108:Polymers / Q000737:chemistry* / Q000528:radiation effects; D012993:Solar Energy; D015032:Zinc / Q000737:chemistry* / Q000528:radiation effects
D006571:Heterocyclic Compounds; D011108:Polymers; D015032:Zinc