Material Requirements for Buffer Layers Used to Obtain Solar Cells with High Open Circuit Voltages

MICROSTRUCTURALLY ENGINEERED p-LAYERS FOR OBTAINING HIGH OPEN-CIRCUIT VOLTAGES IN a-Si:H n-i-p SOLAR CELLS

A study was carried out with the goal of obtaining high open circuit voltages (Voc) in a-Si:H n-i-p solar cells, taking into account the evolutionary nature of the microstructure of the p-layers during growth. It is found that cells with players in the protocrystalline Si:H growth regime give the highest values of Voc not those with microcrystalline Si:H p-layers. Evidence for this conclusion i...

High open circuit voltage organic solar cells based upon fullerene free bulk heterojunction active layers

We have recently reported on a small organic molecule containing a bithiophene core with end-capping phthalimide units (PthTh2Pth) that exhibited a H-aggregation tendency in the solid state and high electron mobility in organic field effect transistors. In this contribution, we have studied both the physical and electrical properties of poly(3-hexylthiophene) (P3HT) and PthTh2Pth thin films by ...

Amorphous silicon/polyaniline heterojunction solar cells: Fermi levels and open-circuit voltages

We fabricated hydrogenated amorphous silicon/polyaniline n–i–p heterojunction solar cells incorporating a doped, hole conducting polyaniline (PANI) layer. The cells were prepared by spin-casting differing polyaniline dispersions corresponding to film conductivities ranging from 10 2 to 10 S/m. The open-circuit voltages VOC of the cells ranged from 0.5–0.7 V. While these open-circuit voltages ar...

Organic Solar Cells Performances Improvement Induced by Interface Buffer Layers

A benzotrithiophene - based low band gap polymer for polymer solar cells with high open - circuit voltage †

novel electron-rich fused aromatic unit, namely benzo[1,2-b:3,4b’:5,6-d’’]trithiophene (BTT), which holds promise as a building block for semiconductor materials. In comparison with the wellknown benzo[1,2-b:4,5-b’]dithiophene (BDT), quantumchemical calculations (B3LYP/6-31G*) predict the BTT unit to 40 be of similar donor strength. Thus, with R being alkyl chains, BTT is predicted to act as a ...