Flexible organic solar cells composed of P3HT:PCBM using chemically doped graphene electrodes

Abstract

Flexible organic solar cells (OSCs) composed of blended films of poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) were fabricated and investigated with chemically doped multilayer graphene films as transparent and conducting electrodes on plastic substrates. The sheet resistance of the chemically doped graphene film was reduced to half of its original value, resulting in a significant performance enhancement of OSCs featuring doped graphene electrodes. Moreover, there was no substantial variation observed in the fill factor and power conversion efficiency values of the flexible OSCs under bending conditions. A power conversion efficiency of ~2.5% for flexible OSCs with doped graphene electrodes was observed under bending conditions, even up to a 5.2 mm bending radius.

Effect of the length of alkyl side chains in the electronic structure of conjugated polymers

“…We also tried to discover whether there might be a characteristic length of the side chains at which the electronic properties would remain unchanged; this might be suitable for use as a modeling approach. We chose to study poly(3-hexylthiophene) (P3HT), a polymer widely used in organic devices (Figure 1) [8][9][10][20][21][22][23][24] . This polymer has a hexyl side chain in each monomer unit.…”

Thin-film organic semiconductor devices: from flexibility to ultraflexibility

“…To date, the TFC electrodes are mostly based on PE-DOT [36,70,74,[82][83][84][85][86][87][88][89][90][91][92][93][94][95][96][97][98], graphene (GF) [73,75,[99][100][101][102][103][104][105][106][107][108][109][110][111][112], carbon nanotubes (CNTs) [73,101,102,[106][107][108][109]113], Ag-based nanowires/grids/films [72,[114][115][116][117][118][119]…”

Semitransparent organic solar cells with hybrid monolayer graphene/metal grid as top electrodes

“…[8][9][10] For example, Acro et al demonstrated organic solar cells (OSCs) with PCE of only 1.18% based on chemical vapor deposition (CVD) graphene electrode. 8 Meanwhile, stacked multi-layer graphene 11,12 and chemically doped graphene films 13,14 have been used to obtain more conductive graphene electrodes. Wang et al reported OSCs with layer-by-layer stacked graphene anode, in which PCE improved to 2.5%.…”

“…Lee et al demonstrated OSCs with HNO 3 -doped graphene electrode, which showed PCE of about 2.5%. 13 However, the stability is a challenge for such chemically doped graphene films.…”