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题目:

Annealing-induced phase separation in small-molecular bulk heterojunctions

 

 

作者:

Huai-Xin Weia, b, Yan-Qing Lia , Xiang-Yu Chena, Chun-Sing Leeb , Jian-Xin Tanga

 

 

单位:

a Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215123, China

b Center of Super-Diamond and Advanced Films (COSDAF), Department of Physics and Materials Science, City University of Hong Kong, Hong Kong Special Administrative Region

 

 

摘要:

Morphology optimization of donor–acceptor bulk heterojunctions at microscopic scale is critical for improving performance of organic photovoltaic devices. Here, effects of thermal annealing on phase separation processes in small-molecular bulk heterojunctions with different geometrical structures (i.e., PTCDA, TiOPc, CuPc and C60) are investigated with ultraviolet and X-ray photoemission spectroscopies. It was identified that post-annealing treatment caused the different degrees of vertical diffusions at the bulk heterojunctions, leading to non-uniform composition distributions. Variations in phase separations are mainly due to the differences in surface energy of the involved materials, which play a crucial role in the intermolecular interactions and the molecular diffusion. Low-surface-energy materials were found to segregate preferentially on the surface for minimizing total energy of the systems.

 

 

影响因子:

3.676

 

 

分区情况:

1

 

 

链接:

http://www.sciencedirect.com/science/article/pii/S1566119914003358

 


 

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