Improvement of bulk heterojunction organic solar cells based on PTB7:PC61BM with small amounts of P3HT
Improvement of bulk heterojunction organic solar cells based on PTB7:PC61BM with small amounts of P3HT
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DOI：
10.7567/jjap.54.04dk09
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发表时间：
2015-03
影响因子：
1.5
通讯作者：
Yurina Ohori;Shunjiro Fujii;H. Kataura;Y. Nishioka
中科院分区：
文献类型：
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作者：
Yurina Ohori;Shunjiro Fujii;H. Kataura;Y. Nishioka
研究了少量聚（3-己基噻吩）（P3 HT）添加剂对聚[[4，8-双[（2-乙基己基）氧基]苯并[1，2-B：4，5-B′]二噻吩-2，6-二基][3-氟-2-[（2-乙基己基）羰基]噻吩并[3，4-B]噻吩二基]：[6，6]-苯基-C61-丁酸甲酯（PTB 7：PC 61 BM）体异质结（BHJ）有机太阳能电池性能的影响。优化后的P3 HT质量分数为5%的太阳能电池表现出明显的改善，开路电压为0.76 V，短路电流密度为17 mA/cm 2，填充因子为0.40，功率转换效率为5.11%。用原子力显微镜观察到，具有5%P3HT重量分数的活性层的畴尺寸显著减小。这表明PTB 7和PC61 BM结构域之间的界面面积增加，导致激子解离增强。这也表明PTB 7：PC61 BM活性层中的少量P3 HT充当介体以增强从PTB 7域到聚（3，4-亚乙基二氧噻吩）：聚（苯乙烯磺酸盐）（PEDOT：PSS）阳极缓冲层的空穴电流。根据表面能分析结果讨论了这些现象的可能机制。
The effect of a small amount of poly(3-hexylthiophene) (P3HT) additive on the performance of bulk heterojunction (BHJ) organic solar cells based on poly[[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b]thiophenediyl]]:[6,6]-phenyl-C61-butyric acid methyl ester (PTB7:PC61BM) was investigated. The optimized solar cell with 5% P3HT weight fraction showed a marked improvement, with an open-circuit voltage of 0.76 V, a short-circuit current density of 17 mA/cm2, a fill factor of 0.40, and a power conversion efficiency of 5.11%. A notable reduction in the domain sizes of the active layers with 5% P3HT weight fraction was observed by atomic force microscopy. This suggests that the interface area between the PTB7 and PC61BM domains increased, resulting in an enhanced exciton dissociation. This also suggests that the small amount of P3HT in the PTB7:PC61BM active layer acted as a mediator to enhance the hole current from PTB7 domains to the poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) anode buffer layer. Possible mechanisms for these phenomena are discussed on the basis of the results of surface energy analysis.