Synthesis and characterization of a new perylene bisimide (PBI) derivative and its application as electron acceptor for bulk heterojunction polymer solar cells
Synthesis and characterization of a new perylene bisimide (PBI) derivative and its application as electron acceptor for bulk heterojunction polymer solar cells
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DOI：
10.1016/j.orgel.2012.07.002
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发表时间：
2012-12
影响因子：
3.2
通讯作者：
G. Sharma;M. Roy;J. Mikroyannidis;K. Thomas
中科院分区：
文献类型：
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作者：
G. Sharma;M. Roy;J. Mikroyannidis;K. Thomas
合成并表征了一种在苝的1，7位上带有2-（4-硝基苯基）丙烯腈基和增溶环己基的对称性苝酰亚胺衍生物（PBI）。PBI的吸收光谱较宽，最大吸收峰位于655 nm，光学带隙为1.72eV。电化学研究表明，PBI的LUMO能级为−3.9eV，与PCBM或PC 70 BM相似。采用聚（3-己基噻吩）（P3 HT）和PBI（1：1 w/w）的共混物作为活性层，由THF浇铸而成的体异质结太阳能电池表现出1.56%的功率转换效率（PCE）。然而，具有从混合溶剂（DIO/THF）沉积的P3 HT：PBI共混物的器件将PCE提高到2.78%，其在使用热退火的活性层时进一步增加到3.17%。PCE的改善归因于共混物（特别是P3 HT）的结晶度的增强和空穴迁移率的增加，从而导致平衡的电荷传输。
A symmetrical perylene bisimide derivative (PBI) with 2-(4-nitrophenyl)acrylonitrile groups at the 1,7 bay positions of perylene and solubilizing cyclohexyl units was synthesized and characterized. The absorption spectrum of PBI was broad with the most prominent peak at 655nm and optical band gap of 1.72eV. The electrochemical investigation indicates that PBI has a LUMO energy level of −3.9eV which is similar to that of PCBM or PC70BM. Bulk heterojunction solar cell fabricated using a blend of poly(3-hexylthiophene) (P3HT) and PBI (1:1 w/w) as active layer cast from THF exhibited power conversion efficiency (PCE) at 1.56%. However, the device with P3HT:PBI blend deposited from mixed solvent (DIO/THF) improved the PCE to 2.78% which further increased to 3.17% on using the thermal annealed active layer. The improvement in the PCE is attributed to the enhanced crystallinity of the blend (particularly P3HT) and increase in hole mobility leading to balanced charge transport.