16.++PBTTT+BHJ+Solar+Cells

16.++PBTTT+BHJ+Solar+Cells - Morphology (III) Probing...

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MATSCI 302 May 14, 2008 A detailed look at bulk heterjunctions made with one polymer PBTTT μ = 0.6 cm 2 /Vs
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pBTTT in a Solar Cell Why Try Current should be comparable to P3HT:PCBM (abs and PL) • V oc should be 800 mV • FF should be high b/c pBTTT has a high mobility Crystallinity of pBTTT is higher than P3HT
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550 600 650 700 750 800 850 900 950 -2000 0 2000 4000 6000 8000 10000 12000 14000 16000 Photoluminescence Quenching of pBttt in a 1:4 pBttt:PC [71] BM Spun Intensity (arb. un.) Wavelength (nm) pBttt Neat Film Blend Film
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Effect of Blending Ratio Parmer et al. APL (2008)
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0.2 0.4 0.6 1E-3 0.01 0.1 1 10 100 1000 10000 100000 Intensity (arb. un.) q (1/Å) Specular X-ray Diffraction pBTTT:PCBM Blends d = 2 . n m 3 0 pBTTT:PCBM 1:0 10:1 4:1 1:1 1:4 2 θ d-space enhancement in the blend from ~2 to ~3 nm 23
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There is space for intercalation
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Grazing Incidence Xray Scattering of pBTTT:PCBM Blends Weak PCBM signature in the 1:1 blend in the vertical direction The blend is still highly crystalline
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Unformatted text preview: Morphology (III) Probing Large-Scale Phase Separation with GISAXS 10-15 nm phase separation in the 1:4 blend, but not the 1:1 blend. Increasing PCBM 1:0 1:4 1:1 10:1 4:1 Intercalation of PCBM 1:1 1:4 Increasing PCBM 1:0 1:4 1:1 10:1 4:1 p (cm 2 /Vs) n (cm 2 /Vs) 1:0 3.6-7.5 x 10-2-1:1 1.5-2.5 x 10-2-1:4 1.1-1.4 x 10-2 0.99-1.4 x 10-3 n++ Silicon Gate Electrode 300 nm SiO 2 Gate Dielectric Au Drain Au Source Au Backside Contact 200 m V d TFTs from pBTTT:PCBM (unannealed) Intercalation in PPVs 30 Melzer et al. AFM 14, 865 (2004). Perhaps intercalation of the fullerene into the MDMO-PPV helps raise the mobility by 500x. The drawings in the literature are misleading. Intercalation in General? Polymers that optimize near 1:4 Polymers that optimize near 1:1 APFO 31...
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This note was uploaded on 12/01/2011 for the course MS&E 302 taught by Professor Mcghee during the Spring '08 term at Stanford.

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16.++PBTTT+BHJ+Solar+Cells - Morphology (III) Probing...

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