Improving the performance of polymer solar cells by adjusting the crystallinity and nanoscale phase separation |
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| Institution: | [1]Sehool of Computer and Communication, Hunan University of Technology, Zhuzhou 412007, China [2]Department of Chemistry, Institute of Molecular Functional Materials and HKU-CAS Joint Laboratory on New Materials, The University of Hong Kong, Pokfulam Road, Hongkong SAR, China [3]Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong SAR, China [4]Department of Electrical ＆ Electronic Engineering, The University of Hong Kong, Pokfulam Road, Hongkong SAR, China |
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| Abstract: | In this paper, we report a high-performance P3HT/PCBM bulk-heterojunction solar cell with a power conversion efficiency of 4.85% fabricated by adjusting the polymer crystallinity and nanoscale phase separation using an ultrasonic irradiation mixing approach for the polymer. The grazing incidence X-ray diffraction, UV/Vis spectroscopic, and atomic force microscopic measurement results for the P3HT/PCBM blend films reveal that the P3HT/PCBM film fabricated by ultrasonic irradiation mixing of the P3HT and PCBM solutions for 10 min has a higher degree of crystallinity, a higher absorption efficiency, and better phase separation, which together account for the higher charge transport properties and photovoltaic cell performance. |
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| Keywords: | crystallinity polymer solar cell ultrasonic irradiation nanoscale phase separation |
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