Modified buffer layers for polymer photovoltaic devices

Abstract

The influence of anode buffer layers on the performance of polymer photovoltaic devices based on blends of poly͑3-hexylthiophene͒ and ͓6,6͔-phenyl-C-61-buytyric acid methyl ester has been investigated. The buffer layers consist of poly͑3,4-ethylenedioxythiophene͒:poly͑styrenesulfonate͒ ͑PEDOT-PSS͒ doped with different concentrations of mannitol. Improved power conversion efficiency, up to 5.2%, has been observed by reducing the resistance of PEDOT:PSS after doping. One extrapolation method has been developed to exclude the resistance from the connection of the electrodes from the total device resistance. The results confirm that the device improvement is due to the reduction of series resistance of the PEDOT:PSS after the mannitol doping.

Reduction of Collection Efficiency of Charge Carriers with Increasing Cell Size in Polymer Bulk Heterojunction Solar Cells

“…[1][2][3][4][5][6] To develop commercially attractive OPV modules, both enlargement of cell size and enhancement of cell PCE are important. To date, however, most researchers have focused on enhancing solar cell PCE by developing novel materials [5][6][7][8][9][10][11] and/or novel device structures, [ 2 , 4 , 11-16 ] with little attention paid to the effects of cell size on solar cell performance. Dependence of cell performance on cell size and geometry has been discussed; however, existing reports have been restricted to obtaining accurate measurements of solar cell performance by reducing the edge effect.…”

Anisotropic hopping conduction in spin-coated PEDOT:PSS thin films

“…2 The combination of a relatively high conductivity 3 with optical transparency in the doped state mates PEDOT:PSS suitable for applications such as antistatic coatings, 4 electrode in light-emitting diodes, 5 photovoltaics, 6 memories, 7 sensors, 8 and as active material for electrochromic devices. 9 As such, PEDOT:PSS has found application in basically all organic and/or polymeric devices.…”

Plasmon enhancement of bulk heterojunction organic photovoltaic devices by electrode modification

“…Those formed from blended regioregular poly͑3-hexylthiophene͒ ͑P3HT͒ and ͕6,6͖-phenyl C 61 -butyric acid methylester ͑PCBM͒ exhibit efficiencies near 5.0% with optimized device structure and fabrication conditions. 6 Here we describe an electrode structure that exploits surface plasmon enhancement of the polymer absorption to improve the efficiency of P3HT:PCBM blend devices.…”