Abstract
[6,6]-phenyl C61-butyric acid methyl ester (PCBM) and poly(3-hexylthiophene) (P3HT) bulk heterojunction solar cells added with zinc-tetra-tertiary-butyl-phthalocyanine (ZnPc) and 1,8-diiodooctane (DIO) were fabricated and characterized. Incident photon-to-current conversion efficiencies in the range of 400-650 nm were increased by the ZnPc addition, and the absorption range of ZnPc overlapped with the photoluminescence range of P3HT. Photovoltaic properties of the solar cells with an inverted structure were improved by the ZnPc and DIO addition. Microstructures of the thin films were analyzed by X-ray diffraction. The improvement would be due to the Forster energy transfer mechanism the direct charge transfer from ZnPc to PCBM, and the phase separation of PCBM and P3HT by the DIO addition would also contribute the improvement.
Highlights
Organic thin-film solar cells have been developed as next-generation solar cell systems, and they have advantages of low cost, flexibility and light weight [1,2,3]
The with Zinc Phthalocyanine and 1,8-Diiodooctane short-circuit current density of the solar cells were improved by the ZnPc addition
incident photon-to-current conversion efficiency (IPCE) spectra of the phenyl C61-butyric acid methyl ester (PCBM):P3HT(ZnPc) solar cells showed peaks at 690 nm, and the IPCE intensities in the range of 400–650 nm were increased by the ZnPc addition
Summary
Organic thin-film solar cells have been developed as next-generation solar cell systems, and they have advantages of low cost, flexibility and light weight [1,2,3]. They can be fabricated at low temperatures by spin-coating and printing methods [4,5]. Polymer solar cells using poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl C61-butyric acid methyl ester (PCBM) have been widely investigated, and the conversion efficiency of ~5 % was obtained [6,7]. Addition of the third components such as phthalocyanines, naphthalocyanines and low-band-gap polymers is expected to absorb light that the P3HT and PCBM cannot collect. Solubilized metal phthalocyanines (MPc) could be dissolved in organic solvents, and the application for the device process using a spin-coating method could be expected
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