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研究了一种由低聚合度的聚[2,6-(4,4-双-(2-乙基己基)-4H-环戊[2,1-b;3,4-b’]双噻吩)-交替-4,7-(2,1,3-苯并噻二唑)](LDP-PCPDTBT)、聚甲基丙烯酸甲酯(PMMA)和[6,6]-苯基-C61-丁酸甲酯(PC61BM)组成的三组分共混薄膜。通过加入溶剂添加剂1,8-二溴辛烷(DBO)进行处理,在未加入溶剂添加剂时,LDP-PCPDTBT相和PC61BM相在PMMA的基质中分别处于无定形和结晶态;应用DBO促进了LDP-PCPDTBT成分的结晶和PC61BM成分的聚集,开路电压明显提高,PMMA基质中的LDP-PCPDTBT和PC61BM的相分离尺度优化,太阳能电池的能量转换效率提高近50%。研究表明,低聚合度交替共聚物能够作为有效的给体材料,与PMMA联合使用利于降低有机太阳能电池材料的成本。
A new type of poly (2,6- (4,4-bis- (2-ethylhexyl) -4H-cyclopenta [2,1-b; 3,4-b ’ ) - alternating -4,7- (2,1,3-benzothiadiazole)] (LDP-PCPDTBT), polymethylmethacrylate (PMMA) and [6,6] -phenyl- Acid methyl ester (PC61BM) composed of three components blend film. By adding solvent additive 1,8-dibromooctane (DBO), LDP-PCPDTBT phase and PC61BM phase were in amorphous and crystalline state respectively in the matrix of PMMA when no solvent additive was added. DBO promoted LDP The crystallization of PCDTBT and the aggregation of PC61BM increased the open circuit voltage significantly. The phase separation of LDP-PCPDTBT and PC61BM in PMMA matrix was optimized, and the energy conversion efficiency of solar cells was increased by nearly 50%. The results show that the low polymerization degree of alternating copolymer can be used as an effective donor material, combined with PMMA help reduce the cost of organic solar cell materials.