Transient photoconductivity in polymer bulk heterojunction solar cells: Competition between sweep-out and recombination
Transient photoconductivity in polymer bulk heterojunction solar cells: Competition between sweep-out and recombination
复制标题
DOI：
10.1103/physrevb.83.035205
复制
发表时间：
2011-01-18
影响因子：
3.7
通讯作者：
Heeger, A. J.
中科院分区：
文献类型：
--
作者：
Cowan, Sarah R.;Street, R. A.;Heeger, A. J.
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，内场的载流子清除和光合成的载流子损失之间存在竞争。瞬态光电导数据意味着存在一个定义良好的内部场；载流子扫出与内部场的大小成正比，并受载流子迁移率的限制。在开路附近的外部电压下，当内部场趋于零时，由于光生的移动载流子的重组，光电流衰减。研究了聚[3-己基噻吩](P3HT):[6,6]-苯基-c(61)-丁酸甲酯（PC(60)BM）和聚[N-9 " -庚癸基-2,7-咔唑-氨基-5,5-（4',7'-二-2-噻基-2',1',3'-苯并噻唑）](PCDTBT):[6,6]-苯基-c(71)-丁酸甲酯（PC(71)BM）太阳能电池中载流子的迁移率和重组寿命。
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',1',3'-benzothiadiazole)] (PCDTBT) : [6,6]-phenyl-C(71)-butyric acid methyl ester (PC(71)BM) solar cells.