不同比例的MEH-PPV与PCBM共混体系光电池性能研究

The performance of solar cell based on blends of MEH-PPV and PCBM of various compositions

以MEH-PPV(poly(2-methoxy-5-(2/-ethylhexoxy)-1,4-phenylene vinylene)为电子给体材料(donor,D),PCBM(1-(3-methoxycarbonyl)-propyl-1-1-phenyl-(6,6)C61)为电子受体材料(acceptor,A),制成了不同比例的共混体系太阳电池.从不同比例的D/A材料共混体系的原子力图、光荧光谱、器件的单电荷传输的暗导J-V图、太阳电池的光敏图及器件双电荷传输的光、暗导J-V图方面,详细分析了不同比例的D/A材料对器件性能影响.得出了当D/A材料比例为1∶4时,器件中活性层能形成良好的互穿网络,光生激子能有效地分离,被分离的电荷能有效地传输,太阳电池的性能最好.其光电池在100mW/cm2强度光照下,其开路电压Voc为0·8V,短路电流密度Jsc为3·47mA/cm2,填充因子FF为55·9%,能量转换效率η为1·55%.

The solar cells based on the blend of MEH-PPV （poly（2-methoxy-5-（2＇-ethylhexoxy）-1,4-phenylene vinylene） as the donor and PCBM（1-（3-methoxycarbonyl）-propyl-1-1-phenyl-（6,6）C61） as the acceptor are fabricated. We analyzed the influence of composition on the performance of the device by measurements of atomic force microscopy, photoluminescence spectroscopy, dark current density-voltage（J-V） curve of charge-only device, wavelength response of photoconductiveity and J-V curve. The highest efficiency is achieved at the 1∶4 （MEHPPV：PCBM） weight ratio. The good performance is attributed to reasons such as the optimized interpenetrating network, effective charge separaption and rapid charges transport in bicontinuous path. We obtained an open circuit voltage of 0.8V, short circuit current density of 3.47mA/cm2 and fill factor of 55.9% under 100mW/cm2 Air-Mass 1.5 solar simulator illumination, yielding a 1.55% power conversion efficiency.