Resistance and lifetime measurements of polymer solar cells using glycerol doped poly[3,4-ethylenedioxythiophene]: poly[styrenesulfonate] hole injection layers

Abstract

We have performed resistivity measurements of poly [3,4-ethylenedioxythiophene]: poly[styrenesulfonate] (PEDOT:PSS) films with varying concentrations of glycerol. Resistivity is seen to decrease exponentially from roughly 3 Ω-cm for pure PEDOT:PSS to 3 × 10 −2 Ω-cm for 35 mg/cm 3 glycerol in PEDOT:PSS. Beyond this concentration adding glycerol does not significantly change resistivity. Bulk heterojunction polymer solar cells using these variously doped PEDOT:PSS layers as electrodes were studied to characterize the effects on efficiency and lifetime. Although our data display significant scatter, lowering the resistance of the PEDOT:PSS layers results in lower device resistance and higher efficiency as expected. We also note that the lifetime of the devices tends to be reduced as the glycerol content of PEDOT:PSS is increased. Many devices show an initial increase in efficiency followed by a roughly exponential decay. This effect is explained based on concomitant changes in the zero bias conductance of the samples under dark conditions.

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“…It is also worth noting that PLA is biodegradable, which may provide means of creating an environmentally friendly device in the future. By comparison, the conductive PLA has a volume resistivity of 0.75W-cm, while un-doped PEDOT:PSS has a volume resistivity of 3W-cm, which can be decreased to approximately 3x10 02 W-cm when doped with glycerol [22] . Using the conductive PLA, we printed two collars that slotted into the chambers.…”