Solution Processed Inverted Organic Bulk Heterojunction Solar Cells Under Ambient Air-Atmosphere

The effect of air processed polymer solar cells fabricated from conjugated polymers and fullerene derivatives poly (3-hexylthiophene) and [6, 6]-phenyl-C61-butyric acid methyl ester functioning as donor and acceptor materials. The device architecture was (Cs2CO3/P3HT: PCBM/V2O5/Al). The spin rate of the Cs2CO3 and P3HT: PCBM layer was subjected to be varied and its device performance were evaluated. The basic characterizations such as UV-Vis spectrum, PL spectra, FTIR, XRD, FESEM, EDAX, AFM and I-V studies were performed for all the materials used for fabricating the devices. The performance of the device demonstrated under air-processed conditions delivers a photo-conversion efficiency of 0.1% initially. The scaling up of the self-organized active layer can be achieved by varying and controlling the spin casting and the evaporation rate at room temperature. After varying the spin conditions the fabricated devices were tested under the same conditions and photo-conversion efficiency enhances from 0.1 to 1.43% with the J(sc) of 5.6 mA cm(-2); V-oc of 0.55 V and FF of 0.454. The device performance can be further enhanced by controlling the exposure of the electrode materials by masking.