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Transient photoconductivity in polymer bulk heterojunction solar cells: Competition between sweep-out and recombination

机译:聚合物本体异质结太阳能电池中的瞬态光电导:清除与复合之间的竞争

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摘要

Transient photoconductivity measurements carried out on bulk heterojunction (BHJ) solar cells demonstrate the competition between carrier sweep-out by the internal field and the loss of photogenerated carriers by recombination. The transient photoconductance data imply the existence of a well-defined internal field; carrier sweep-out is proportional to the magnitude of the internal field and limited by the carrier mobility. At external voltages near open circuit where the internal field approaches zero, the photocurrent decays because of the recombination of photogenerated mobile carriers. Mobility and recombination lifetimes are evaluated for carriers in poly[3-hexylthiophene] (P3HT): [6,6]-phenyl-C_(61)-butyric acid methyl ester (PC_(60)BM) and poly[N-9"-hepta-decanyl-2,7-carbazole-alt-5,5-(4',7'-di-2-thienyl-2',l',3'-benzothiadiazole)] (PCDTBT) : [6,6]-phenyl-C_(71)-butyric acid methyl ester (PC_(71)BM) solar cells.
机译:在体异质结(BHJ)太阳能电池上进行的瞬态光电导率测量表明,内部电场清除载流子和重组产生的光生载流子会造成损失。瞬态光电导数据表明存在定义明确的内部场;载流子清除与内部场强成正比,并受载流子迁移率限制。在内部电路接近零的开路附近的外部电压下,由于光生移动载流子的重组,光电流衰减。评估了聚[3-己基噻吩](P3HT)中的载体的迁移性和重组寿命:[6,6]-苯基-C_(61)-丁酸甲酯(PC_(60)BM)和聚[N-9“ -庚-癸基-2,7-咔唑-alt-5,5-(4',7'-二-2-噻吩基-2',l',3'-苯并噻二唑)](PCDTBT):[6,6 ]-苯基-C_(71)-丁酸甲酯(PC_(71)BM)太阳能电池。

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