摘要
以PC[70]BM(phenyl C71-butyric acid methyl ester)取代PC[60]BM(phenyl C61-butyric acid methyl ester)作为电子受体材料,以MEH-PPV(poly[2-methoxy-5-(2′-ethylhexyloxy)-1,4-phenylenevinylene])为电子给体材料,制成了本体异质结(bulk heterojunction,BHJ)聚合物太阳能电池.MEH-PPV/PC[70]BM器件在AM1.5G(80 mW/cm2)模拟太阳光的光照条件下得到了3.42%的能量转换效率,短路电流值达到了6.07 mA/cm2,开路电压0.85 V,填充因子为53%.通过紫外可见吸收光谱和外量子效率的研究,发现PC[70]BM作为电子受体,对扩大光谱的吸收范围和增加活性层的吸收系数有明显的作用.同时比较了不同溶剂对该体系器件性能的影响.通过原子力显微镜(AFM)、光暗导I-V曲线等研究,分析了1,2-二氯苯有利于给体相和受体相的微相分离和载流子的传输的原因.
A bulk heterojunction photovohaic cell in which an isomeric mixture of fullerene derivatives, PC[70] BM is used as an electron acceptor in combination with poly（2-methoxy-5-（2＇-ethylhexyloxy）-i ,4-phenylene vinylene） （MEH-PPV） as an electron donor has been reported. PC [70] BM is the higher fullerene analogue of PC [60 ] BM, and displays improved light absorption in the visible region. It is found out when this material is used instead of PC[60] BM in a photovoltaic cell with MEH-PPV as donor, a value of 6.07 mA/cm2 current density for the PC[70] BM： MEH-PPV devices means an increase of over 40% with respect to an optimized PC[60]BM： MEH-PPV cell. The open-circuit voltage Voc of 0.85 V and a fill factor （FF） of 0.53 for the PC[70] BM：MDMO-PPV devices resulted in an overall power-conversion efficiency of 3.42%, measured under AM1.5G, solar simulater （80 mW/cm2）. The influence of different solvents used for spin-casting of active layer on device performance was studied. The results showed that 1,2-dichlorobenzene was a best solvent for PC [ 70] BM/MEH-PPV system. The mechanism of the solvent influence on the device performance was analyzed by light and dark I-V curve, AFM, and reasonable explanations were given. Morphology studies on the blend films indicated that excellent miscibility between polymer and PC[70] BM favored exciton separation. Because the exciton diffusion length in organic materials is typically small, the intimate mixture favors exciton separation and therefore higher photocurrent.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2008年第10期993-997,共5页
Acta Polymerica Sinica
基金
国家自然科学基金(基金号50433030)
科技部国家重点基础研究发展规划(973项目
项目号2002CB613404)资助项目
