Effects of annealing on the nanomorphology and performance of poly(alkylthiophene):fullerene bulk-heterojunction solar cells
Effects of annealing on the nanomorphology and performance of poly(alkylthiophene):fullerene bulk-heterojunction solar cells
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DOI：
10.1002/adfm.200601038
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发表时间：
2007-05-07
影响因子：
19
通讯作者：
Sariciftci, N. Serdar
中科院分区：
文献类型：
--
作者：
Nguyen, Le Huong;Hoppe, Harald;Sariciftci, N. Serdar
报道了聚（3-烷基噻吩）：[6,6]-苯基- c -61丁酸甲酯（P3AT-PCBM）共混物在薄膜形成和随后的热退火过程中纳米形态的演变。详细讨论了烷基侧链长度对聚合物/富勒烯相分离的影响。研究了丁基、己基、辛基、癸基和十二烷基侧基。所有使用的p3at都是区域规则的。为了阐明纳米形态，原子力显微镜（AFM）， x射线衍射和光学。应用光谱学。此外，还构建了不同p3at的光伏器件，并对其进行了表征，并与共混物的纳米结构进行了关联。提出了通常用于P3AT:PCBM共混膜的热退火步骤同时控制两个主要问题：a) MAT的结晶和b) PCBM的相分离和扩散。结果表明，pcb扩散是制约器件高性能的主要因素。
The evolution of nanomorphology within thin solid-state films of poly(3-alkylthiophene):[6,6]-phenyl-C-61 butyric acid methyl ester (P3AT-PCBM) blends during the film formation and subsequent thermal annealing is reported. In detail, the influence of the MAT's alkyl side chain length on the polymer/fullerene phase separation is discussed. Butyl, hexyl, octyl, decyl, and dodecyl side groups are investigated. All of the P3ATs used were regioregular. To elucidate the nanomorphology, atomic force microscopy (AFM), X-ray diffraction, and optical. spectroscopy are applied. Furthermore, photovoltaic devices of each of the different P3ATs have been constructed, characterized, and correlated with the nanostructure of the blends. It is proposed that the thermal-annealing step, commonly applied to these P3AT:PCBM blend films, controls two main issues at the same time: a) the crystallization of MAT and b) the phase separation and diffusion of PCBM. The results show that PCBM diffusion is the main limiting process for reaching high device performances.