Improvement of power efficiency of polymer solar cell based on P3HT: PCBM blends

摘要

The effect of interlayer on the performance of a poly[2-methoxy-5-(3',7'-dimethylocty)-l,4-phenylenevinylene] (MDMO-PPV)/1-(3-methoxycarbony 1)-propyl-1 phneyl-(6-6)C_(61) (PCBM) composite solar cell device has been reported recently. Herein we report bulk heterojunction organic solar cell with efficiency enhanced by interlayer made from blend film of regioregular poly(3-hexylthiophene)(P3HT) and PCBM. The interlayer, poly(9,9-dioctylfluorene)-co-N-(1,4-butylphenyl)diphenylamine)(TFB),was inserted between the poly(3,4-ethylene dioxythiophene)-poly(styrene sulfonic acid)(PEDOT:PPS) and the active layer. With the interlayer, the efficiency was enhanced due to the increased short circuit current density (Jsc) , open circuit voltage (Voe) and fill factor (FF) obtained from testing and calculation. According to the analysis, the interlayer TFB, acting as an effective exciton-blocking layer, prevented the severe quenching of radiative excitons between the interface of PEDOT:PSS. In the study, the interlayer increased Jsc from 0.891 mA/cm~2 to 1.025 mA/cm~(-2) , Voc from 0.478 V to 0.526 V , and FF from 0.327 to 0.416, under illumination by white light from a solar simulator with an incident intensity of 80mW/cm~2; the power conversion efficiency of the device reached higher value 0.280% comparing with 0.174%with no interlayer.